Magnesium reacts with oxygen to form magnesium oxide. How

Problem 1QP Use the kinetic molecular theory of gases to explain each of the following: a. Gas particles move faster at higher temperatures. b. Gases can be compressed much more than liquids or solids.

Problem 1SC As more helium gas is added to a balloon, the number of grams of helium increases. What property of a gas is described?

Problem 2QP Use the kinetic molecular theory of gases to explain each of the following: a. A container of nonstick cooking spray explodes when thrown into a fire. b. The air in a hot-air balloon is heated to make the balloon rise.

Problem 2SC A sample of helium gas has a volume of 150 mL at 750 torr. If the volume expands to 450 mL at constant temperature, what is the new pressure in torr?

Problem 3QP Identify the property of a gas that is measured in each of the following: a. 350 K b. 125 mL c. 2.00 g of O2 d. 755 mmHg

Problem 3SC In an underground gas reserve, a bubble of methane gas (CH4) has a volume of 45.0 mL at 1.60 atm. What volume, in milliliters, will it occupy when it reaches the surface where the atmospheric pressure is 745 mmHg, if there is no change in the temperature and amount of gas?

Problem 4QP Identify the property of a gas that is measured in each of the following: a. 425 K b. 1.0 atm c. 10.0 L d. 0.50 mol of He

A mountain climber with a body temperature of \(37^{\circ} \mathrm{C}\) inhales 486 mL of air at a temperature of \(-8^{\circ} \mathrm{C}\). What volume, in milliliters, will the air occupy in the lungs, if the pressure and amount of gas do not change?

Problem 5QP What units are used to measure the pressure of a gas?

Problem 5SC In a storage area where the temperature has reached 55 °C, the pressure of oxygen gas in a 15.0-L steel cylinder is 965 torr. To what temperature, in degrees Celsius, would the gas have to be cooled to reduce the pressure to 850. torr?

Problem 6QP Which of the following statement(s) describes the pressure of a gas? a. the force of the gas particles on the walls of the container b. the number of gas particles in a container c. the volume of the container d. 3.00 atm e. 750 torr

Problem 6SC A weather balloon is filled with 15.0 L of helium at a temperature of 25 °C and a pressure of 685 mmHg. What is the pressure (mmHg) of the helium in the balloon in the upper atmosphere when the temperature is — 35 °C and the volume becomes 34.0 L, if the amount of He does not change?

Problem 7QP An oxygen tank contains oxygen (O2) at a pressure of 2.00 atm. What is the pressure in the tank in terms of the following units? a. torr b. mmHg

Problem 7SC A sample containing 8.00 g of oxygen gas has a volume of 5.00 L. What is the volume, in liters, after 4.00 g of oxygen gas is added to the 8.00 g in the balloon, if temperature and pressure do not change?

Problem 8QP On a climb up Mt. Whitney, the atmospheric pressure is 467 mmHg. What is the pressure in terms of the following units? a. atm b. torr

Problem 8SC How many grams of N2(g) are in 5.6 L of N2(g) at STP?

Why do scuba divers need to exhale air when they ascend to the surface of the water?

Problem 9SC H2 gas forms when zinc metal reacts with aqueous HCl according to the following equation: Zn(s) + 2HCl(aq) ? ZnCl2(aq) + H2(g) How many liters of H2 gas at STP are when 15.8 g of zinc reacts?

Problem 10QP Why does a sealed bag of chips expand when you take it to a higher altitude?

Problem 10SC Chlorine gas, Cl2, is used to purify water. How many moles of chlorine gas are in a 7.00 L tank if the gas has a pressure of 865 mmHg and a temperature of 24 °C?

Problem 11QP The air in a cylinder with a piston has a volume of 220 mL and a pressure of 650 mmHg. a. To obtain a higher pressure inside the cylinder at constant temperature and amount of gas, should the cylinder change as shown in A or B? Explain your choice. ________________ b.If the pressure inside the cylinder increases to 1.2 atm, what is the final volume, in milliliters, of the cylinder? Complete the following data table: Property Conditions 1 Conditions 2 Know Predict Pressure (P) Volume (V)

Problem 11SC What is the volume of 1.20 g of carbon monoxide at 8 °C if it has a pressure of 724 mmHg?

Problem 12QP A balloon is filled with helium gas. When each of the following changes are made at constant temperature, which of these diagrams (A, B, or C) shows the final volume of the balloon? a. The balloon floats to a higher altitude where the outside pressure is lower. b. The balloon is taken inside the house, but the atmospheric pressure remains the same. c. The balloon is put in a hyperbaric chamber in which the pressure is increased.

Problem 12SC What is the molar mass of an unknown gas in a 1.50-L container if 0.488 g of the gas has a pressure of 0.0750 atm at 19 °C?

A gas with a volume of 4.0 L is in a closed container. Indicate what changes (increases, decreases, does not change) in pressure must have occurred if the volume undergoes the following changes at constant temperature and amount of gas: a. The volume is compressed to 2.0 L. b. The volume expands to 12 L. c. The volume is compressed to 0.40 mL.

Problem 13SC If 12.8 g of aluminum reacts with HCl, how many liters of H2 would be formed at 715 mmHg and 19 °C? 2Al(s) + 6HCl(aq) ? AlCl3(aq) + 3H2(g)

Problem 14QP A gas at a pressure of 2.0 atm is in a closed container. Indicate the changes (increases, decreases, does not change) in its volume when the pressure undergoes the following changes at constant temperature and amount of gas: a. The pressure increases to 6.0 atm. b. The pressure remains at 2.0 atm. c. The pressure drops to 0.40 atm.

Problem 14SC An anesthetic consists of a mixture of cyclopropane gas, C3H6, and oxygen gas, O2. If the mixture has a total pressure of 1.09 atm, and the partial pressure of the cyclopropane is 73 torr, what is the partial pressure (torr) of the oxygen in the anesthetic?

Problem 15QP A 10.0-L balloon contains helium gas at a pressure of 655 mmHg. What is the new pressure, in mmHg, of the helium gas at each of the following volumes, if there is no change in temperature and amount of gas? a. 20.0 L b. 2.50 L c. 1500 mL

Problem 16QP The air in a 5.00-L tank has a pressure of 1.20 atm. What is the new pressure, in atm, of the air when the air is placed in tanks that have the following volumes, if there is no change in temperature and amount of gas? a. 1.00 L b. 2500 mL c. 750 mL

Problem 17QP A sample of nitrogen (N2) has a volume of 50.0 L at a pressure of 760. mmHg. What is the volume, in liters, of the gas at each of the following pressures, if there is no change in temperature and amount of gas? a. 1500 mmHg b. 4.00 atm c. 0.500 atm

Problem 18QP A sample of methane (CH4) has a volume of 25 mL at a pressure of 0.80 atm. What is the volume of the gas at each of the following pressures, if there is no change in temperature and amount of gas? a. 0.40 atm b. 2.00 atm c. 2500 mmHg

Problem 19QP Cyclopropane, C3H6, is a general anesthetic. A 5.0-L sample has a pressure of 5.0 atm. What is the volume, in liters, of this gas given to a patient at a pressure of 1.0 atm with no change in temperature and amount of gas?

Problem 20QP The volume of air in a person’s lungs is 615 mL at a pressure of 760. mmHg. Inhalation occurs as the pressure in the lungs drops to 752 mmHg with no change in temperature and amount of gas. To what volume, in milliliters, did the lungs expand?

Problem 21QP Use the words inspiration or expiration to describe the part of the breathing cycle that occurs because of each of the following: a. The diaphragm contracts (flattens out). b. The volume of the lungs decreases. c. The pressure within the lungs is less than that of the atmosphere.

Use the words inspiration or expiration to describe the part of the breathing cycle that occurs because of each of the following: a. The diaphragm relaxes, moving up into the thoracic cavity. b. The volume of the lungs expands. c. The pressure within the lungs is greater than that of the atmosphere.

Problem 23QP Select the diagram that shows the final volume of a balloon when the following changes are made at constant pressure: a. The temperature is changed from 100 K to 300 K. b. The balloon is placed in a freezer. c. The balloon is first warmed and then returned to its starting temperature.

Problem 24QP Indicate whether the final volume in each of the following is the same, larger, or smaller than the initial volume, if pressure and amount of gas do not change: a. A volume of 505 mL of air on a cold winter day at –15 °C is breathed into the lungs, when body temperature is 37 °C. b. The heater used to heat the air in a hot-air balloon is turned off. c. A balloon filled with helium at the amusement park is left in a car on a hot day.

Problem 25QP A sample of neon initially has a volume of 2.50 L at 15 °C. What final temperature, in degrees Celsius, is needed to change the volume of the gas to each of the following, if nand P do not change? a. 5.00 L b. 1250 mL c. 7.50 L d. 3550 mL

Problem 26QP A gas has a volume of 4.00 L at 0 °C. What final temperature, in degrees Celsius, is needed to change the volume of the gas to each of the following, if P and n do not change? a. 1.50 L b. 1200 mL c. 250 L d. 50.0 mL

Problem 27QP A balloon contains 2500 mL of helium gas at 75 °C. What is the final volume, in milliliters, of the gas when the temperature changes to each of the following, if n and P do not change? a. 55 °C b. 680. K c. ?25 °C d. 240. K

Problem 28QP An air bubble has a volume of 0.500 L at 18 °C. What is the final volume, in liters, of the gas when the temperature changes to each of the following, if n and P do not change? a. 0 °C b. 425 K c. ?12 °C d. 575 K

Why do aerosol cans explode if heated?

Why is there an increased danger of the tires on a car having a blowout when the car is driven on hot pavement in the desert?

For the following, calculate the final temperature of the gas, in degrees Celsius, when initial pressure is changed, with V and n constant: a. A sample of xenon at 25 \(^\circ \mathrm C\) and 745 mmHg is cooled to give a pressure of 625 mmHg. b. A tank of argon gas with a pressure of 0.950 atm at -18 \(^\circ \mathrm C\) is heated to give a pressure of 1250 torr.

Problem 32QP For the following, calculate the final temperature of the gas, in degrees Celsius, when initial pressure is changed, with V and n constant: a. A tank of helium gas with a pressure of 250 torr at 0 °C is heated to give a pressure of 1500 torr. b. A sample of air at 40. °C and 745 mmHg is cooled to give a pressure of 685 mmHg.

Problem 33QP Calculate the final pressure, in millimeters of mercury, for each of the following, with n and V constant: a. A gas with an initial pressure of 1200 torr at 155 °C is cooled to 0 °C. b. A gas in an aerosol can at an initial pressure of 1.40 atm at 12 °C is heated to 35 °C.

Problem 34QP Solve for the final pressure when each of the following temperature changes occurs, with V and n constant: a. A gas with an initial pressure of 1.20 atm at 75 °C is cooled to ?22 °C. b. A sample of N2 with an initial pressure of 780. mmHg at ?75 °C is heated to 28 °C.

Problem 35QP Match the terms vapor pressure, atmospheric pressure, and boiling point to the following descriptions: a. the temperature at which bubbles of vapor appear within the liquid b. the pressure exerted by a gas above the surface of its liquid

Problem 36QP Match the terms vapor pressure, atmospheric pressure, and boiling point to the following descriptions: a. the pressure exerted on Earth by the particles in the air b. the temperature at which the vapor pressure of a liquid becomes equal to the external pressure

Explain each of the following observations: a. Water boils at \(87^{\circ} \mathrm{C}\) on the top of Mount Whitney. b. Food cooks more quickly in a pressure cooker than in an open pan.

Problem 38QP Explain each of the following observations: a. Boiling water at sea level is hotter than boiling water in the mountains. b. Water used to sterilize surgical equipment is heated to 120 °C at 2.0 atm in an autoclave.

Problem 39QP A sample of helium gas has a volume of 6.50 L at a pressure of 845 mmHg and a temperature of 25 °C. What is the final pressure of the gas, in atmospheres, when the volume and temperature of the gas sample are changed to the following, if the amount of gas does not change? a. 1850 mL and 325 K b. 2.25 L and 12 °C c. 12.8 L and 47 °C

Problem 40QP A sample of argon gas has a volume of 735 mL at a pressure of 1.20 atm and a temperature of 112 °C. What is the final volume of the gas, in milliliters, when the pressure and temperature of the gas sample are changed to the following, if the amount of gas does not change? a. 658 mmHg and 281 K b. 0.55 atm and 75 °C c. 15.4 atm and ?15 °C

Problem 41QP A 124-mL bubble of hot gas initially at 212 °C and 1.80 atm is emitted from an active volcano. What is the final temperature, in degrees Celsius, of the gas in the bubble outside the volcano if the final volume of the bubble is 138 mL and the pressure is 0.800 atm, if the amount of gas remains constant?

Problem 42QP A scuba diver 60 ft below the ocean surface inhales 50.0 mL of compressed air from a scuba tank at an initial pressure of 3.00 atm and temperature of 8 °C. What is the final pressure of air, in atmospheres, in the lungs when the gas expands to 150.0 mL at a body temperature of 37 °C, and the amount of gas remains constant?

Problem 43QP What happens to the volume of a bicycle tire or a basketball when you use an air pump to add air?

Problem 44QP Sometimes when you blow up a balloon and release it, it flies around the room. What is happening to the air that was in the balloon and its volume?

Problem 45QP A sample containing 1.50 moles of neon gas has an initial volume of 8.00 L. What is the final volume of gas, in liters, when the following changes occur in the quantity of the gas at constant pressure and temperature? a. A leak allows one-half of the neon atoms to escape. b. A sample of 25.0 g of neon is added to the 1.50 moles of neon gas in the container. c. A sample of 3.50 moles of O2 is added to the 1.50 moles of neon gas in the container.

Problem 46QP A sample containing 4.80 g of O2 gas has an initial volume of 15.0 L. Pressure and temperature remain constant. a. What is the final volume if 0.500 mole of O2 gas is added? b. Oxygen is released until the volume is 10.0 L. How many moles of O2 remain? c. What is the final volume after 4.00 g of He is added to the 4.80 g of O2 gas in the container?

Problem 47QP Use the molar volume to calculate each of the following at STP: a. the number of moles of O2 in 44.8 L of O2 gas b. the number of moles of CO2 in 4.00 L of CO2 gas c. the volume (L) occupied by 6.40 g of O2 gas d. the volume (mL) occupied by 50.0 g of Ne gas

Problem 48QP Use the molar volume to calculate each of the following at STP: a. the volume (L) occupied by 2.50 mol of N2 gas b. the volume (mL) occupied by 0.420 mol of He gas c. the number of grams of neon contained in 11.2 L of Ne gas d. the number of moles of H2 in 1620 mL of H2 gas

Problem 49QP Mg metal reacts with HCl to produce hydrogen gas. Mg(s) + 2HCl(aq)? MgCl2(aq) + H2(g) What volume, in liters, of H2 at STP is released when 8.25 g of Mg reacts?

Problem 50QP Aluminum oxide can be formed from its elements. How many grams of Al will react with 12.0 L of O2 at STP?

Problem 51QP Calculate the pressure, in atmospheres, of 2.00 mol of helium gas in a 10.0-L container at 27 °C.

Problem 52QP What is the volume, in liters, of 4.00 mol of methane gas, CH4, at 18 °C and 1.40 atm?

An oxygen gas container has a volume of 20.0 L. How many grams of oxygen are in the container if the gas has a pressure of 845 mmHg at 22 \(^\circ \mathrm C\)?

Problem 54QP A 10.0-g sample of krypton has a temperature of 25 °C at 575 mmHg. What is the volume, in milliliters, of the krypton gas?

Problem 55QP A 25.0-g sample of nitrogen, N2, has a volume of 50.0 L and a pressure of 630. mmHg. What is the temperature, in kelvins and degrees Celsius, of the gas?

Problem 56QP A 0.226-g sample of carbon dioxide, CO2, has a volume of 525 mL and a pressure of 455 mmHg. What is the temperature, in kelvins and degrees Celsius, of the gas?

Problem 57QP Using molar volume (STP) or the ideal gas law equation, determine the molar mass, g/mole, of each of the following: a. 0.84 g of a gas that has a volume of 450 mL at STP b. 1.48 g of a gas that has a volume of 1.00 L at 685 mmHg and 22 °C c. 2.96 g of a gas that has a volume of 2.30 L at 0.95 atm and 24 °C

Problem 58QP Using molar volume (STP) or the ideal gas law equation, determine the molar mass, g/mole, of each of the following: a. 11.6 g of a gas that has a volume of 2.00 L at STP b. 0.726 g of a gas that has a volume of 855 mL at 1.20 atm and 18°C c. 2.32 g of a gas that has a volume of 1.23 L at 685 mmHg and 25 °C

Problem 59QP Butane undergoes combustion when it reacts with oxygen to produce carbon dioxide and water. What volume, in liters, of oxygen is needed to react with 55.2 g of butane at 0.850 atm and 25 °C? 2C4H10(g) + 13O2(g) 8CO2(g) + 10H2O(g)

Problem 60QP When heated to 350. °C at 0.950 atm, ammonium nitrate decomposes to produce nitrogen, water, and oxygen gases. Using the ideal gas law equation, calculate the volume, in liters, of water vapor produced when 25.8 g of NH4NO3 decomposes.

Problem 61QP Aluminum and oxygen react to form aluminum oxide. How many liters of oxygen at 0 °C and 760 mmHg (STP) are required to completely react with 5.4 g of aluminum? 4Al(s) + 3O2(g) ? 2A2O3(s)

Problem 62QP Nitrogen dioxide reacts with water to produce oxygen and ammonia. How many grams of NH3 can be produced when 4.00 L of NO2 reacts at 415 °C and 725 mmHg? 4NO2(g) + 6H2O(g) ? 7O2(g) + 4NH3(g)

Problem 63QP A typical air sample in the lungs contains oxygen at 98 mmHg, nitrogen at 573 mmHg, carbon dioxide at 40. mmHg, and water vapor at 47 mmHg. What is the total pressure, in mmHg, of the gas sample?

Problem 64QP A Nitrox II gas mixture for scuba diving contains oxygen gas at 53 atm and nitrogen gas at 94 atm. What is the total pressure, in atm, of the scuba gas mixture?

Problem 65QP In a gas mixture, the partial pressures are nitrogen 425 torr, oxygen 115 torr, and helium 225 torr. What is the total pressure, in torr, exerted by the gas mixture?

In a gas mixture, the partial pressures are argon 415 mmHg, neon 75 mmHg, and nitrogen 125 mmHg. What is the total pressure, in millimeters of mercury, exerted by the gas mixture?

Problem 67QP A gas mixture containing oxygen, nitrogen, and helium exerts a total pressure of 925 torr. If the partial pressures are oxygen 425 torr and helium 75 torr, what is the partial pressure, in torr, of the nitrogen in the mixture?

Problem 68QP A gas mixture containing oxygen, nitrogen, and neon exerts a total pressure of 1.20 atm. If helium added to the mixture increases the pressure to 1.50 atm, what is the partial pressure, in atmospheres, of the helium?

Problem 69QP In certain lung ailments such as emphysema, there is a decrease in the ability of oxygen to diffuse into the blood. a. How would the partial pressure of oxygen in the blood change? b. Why does a person with severe emphysema sometimes use a portable oxygen tank?

Problem 70QP An injury to the head can affect the ability of a person to ventilate (breathe in and out), and so can certain drugs. a. What would happen to the partial pressures of oxygen and carbon dioxide in the blood if a person cannot properly ventilate? b. When a person with hypoventilation is placed on a ventilator, an air mixture is delivered at pressures that are alternately above and below the air pressure in the person’s lung. How will this move oxygen gas into the lungs, and carbon dioxide out?

Problem 71UTC At 100 °C, which of the following diagrams (1, 2, or 3) represents a gas sample that exerts the: a. lowest pressure? b. highest pressure?

Problem 72UTC Indicate which diagram (1, 2, or 3) represents the volume of the gas sample in a flexible container when each of the following changes takes place: a. Temperature increases at constant pressure. b. Temperature decreases at constant pressure. c. Pressure decreases at constant temperature. d. Doubling the pressure and doubling the Kelvin temperature.

Problem 73UTC A balloon is filled with helium gas with a pressure of 1.00 atm and neon gas with a pressure of 0.50 atm. For each of the following changes of the initial balloon, select the diagram (A, B, or C) that shows the final volume of the balloon: a. The balloon is put in a cold storage unit (P and n constant). b. The balloon floats to a higher altitude where the pressure is less (n and Tconstant). c. All of the helium gas is removed (T and P constant) . d. The Kelvin temperature doubles, and half of the gas atoms leak out (P constant) . e. 2.0 mol of O2 gas is added at constant T and P.

Indicate if pressure increases, decreases, or does not change in each of the following: (7.3, 7.5, 7.7)

Problem 75AQP At a restaurant, a customer chokes on a piece of food. You put your arms around the person’s waist and use your fists to push up on the person’s abdomen, an action called the Heimlich maneuver. a. How would this action change the volume of the chest and lungs? b. Why does it cause the person to expel the food item from the airway?

Problem 76AQP An airplane is pressurized to 650. mmHg. (7.9) a. If air is 21% oxygen, what is the partial pressure of oxygen on the plane? b. If the partial pressure of oxygen drops below 100. mmHg, passengers become drowsy. If this happens, oxygen masks are released. What is the total cabin pressure at which oxygen masks are dropped?

Problem 77AQP In 1783, Jacques Charles launched his first balloon filled with hydrogen gas, which he chose because it was lighter than air. The balloon had a volume of 31 000 L when it reached an altitude of 1000 m, where the pressure was 658 mmHg and the temperature was ? 8 °C. How many kilograms of hydrogen were used to fill the balloon at STP? (7.7) Jacques Charles used hydrogen to launch his balloon in 1783.

Problem 78AQP Your spaceship has docked at a space station above Mars. The temperature inside the space station is a carefully controlled 24 °C at a pressure of 745 mmHg. A balloon with a volume of 425 mL drifts into the airlock where the temperature is ?95 °C and the pressure is 0.115 atm. What is the final volume, in milliliters, of the balloon if n remains constant and the balloon is very elastic?

A fire extinguisher has a pressure of 10. atm at \(25^{\circ} \mathrm{C}\). What is the pressure, in atmospheres, if the fire extinguisher is used at a temperature of \(75^{\circ} \mathrm{C}\) and V and n remain constant? (7.5)

Problem 80AQP A weather balloon has a volume of 750 L when filled with helium at 8 °C at a pressure of 380 torr. What is the final volume, in liters, of the balloon when the pressure is 0.20 atm, the temperature is ?45 °C, and n remains constant?

Problem 81AQP A sample of hydrogen (H2) gas at 127 °C has a pressure of 2.00 atm. At what temperature (°C) will the pressure of the H2 decrease to 0.25 atm, if V and n remain constant? (7.5)

A sample of nitrogen (\(N_2\)) gas has a pressure of 745 mmHg at \(30 .{ }^{\circ} \mathrm{C}\). What is the pressure when the temperature rises to \(125^{\circ} \mathrm{C}\)? (7.5)

Problem 83AQP How many moles of CO2 are in 35.0 L of CO2(g) at 1.2 atm and 5 °C? (7.8)

Problem 84AQP A container is filled with 0.67 mole of O2 at 5 °C and 845 mmHg. What is the volume, in milliliters, of the container? (7.8)

Problem 85AQP A 2.00-L container is filled with methane gas, CH4, at a pressure of 2500. mmHg and a temperature of 18 °C. How many grams of methane are in the container?

Problem 86AQP A steel cylinder with a volume of 15.0 L is filled with 50.0 g of nitrogen gas at 25 °C. What is the pressure, in atmospheres, of the N2 gas in the cylinder?

Problem 87AQP When heated, calcium carbonate decomposes to give calcium oxide and carbon dioxide gas. If 56.0 g of CaCO3 react, how many liters of CO2 gas are produced at STP? (7.7)

Problem 88AQP Magnesium reacts with oxygen to form magnesium oxide. How many liters of oxygen gas at STP are needed to react completely with 8.0 g of magnesium? (7.7)

In the Haber process, \(H_2\) and \(N_2\) react to produce ammonia (\(NH_3\)). How many grams of \(N_2\) are needed to produce 150 L of ammonia at STP? (7.6) \(3 \mathrm{H}_{2}(\mathrm{~g})+\mathrm{N}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{NH}_{3}(\mathrm{~g})\)

Problem 90AQP How many liters of H2 gas at STP can be produced from the reaction of 2.45 g of Al with excess HCl? (7.6) 2Al(s) + 6HCl(aq) ? 2AlCl3(aq) + 3H2(g)

Problem 91AQP Aluminum oxide can be formed from its elements. What volume, in liters, of oxygen at STP is needed to completely react 5.4 g of Al? (7.6)

Problem 92AQP Glucose, C6H12O6, is metabolized in living systems to CO2 and H2O. How many grams of water can be produced from 12.5 L of O2 at STP? (7.6) C6H12O6(s) + 6O2(g) ? 6CO2(g) + 6H2O(l)

Problem 93AQP A sample of gas with a mass of 1.62 g occupies a volume of 941 mL at a pressure of 748 torr and a temperature of 20.0 °C. What is the molar mass of the gas?

Problem 94AQP What is the molar mass of a gas if 1.15 g of the gas has a volume of 225 mL at 0 °C and 1.00 atm (STP)?

Problem 95AQP Nitrogen dioxide reacts with water to produce oxygen and ammonia. How many liters of O2 are produced when 0.42 mole of NO2 reacts at STP? (7.7, 7.8)

Problem 96AQP What is the volume, in liters, of H2 gas produced at STP from the reaction of 25.0 g of Al? (7.7) 2Al(s) + 3H2SO4(aq) ? Al2(SO4)3(aq) + 3H2(g)

Problem 98AQP At an altitude of 30.0 km, where the temperature is ?35 °C, a weather balloon containing 1.75 moles of helium has a volume of 2460 L. What is the pressure, in mmHg, of the helium inside the balloon? (7.8)

Problem 97AQP A weather balloon is partially filled with helium to allow for expansion at high altitudes. At STP, a weather balloon is filled with enough helium to give a volume of 25.0 L. How many grams of helium were added to the balloon? (7.6, 7.7)

A gas mixture contains oxygen and argon at partial pressures of 0.60 atm and 425 mmHg. If nitrogen gas added to the sample increases the total pressure to 1250 torr, what is the partial pressure, in torr, of the nitrogen added? (7.9)

A gas mixture contains helium and oxygen at partial pressures of 255 torr and 0.450 atm. What is the total pressure, in millimeters of mercury, of the mixture after it is placed in a container one-half the volume of the original container?

Problem 101CQ A gas sample has a volume of 4250 mL at 15 °C and 745 mmHg. What is the final temperature, in degrees Celsius, after the sample is transferred to a different container with a volume of 2.50 L and a pressure of 1.20 atm, when n remains constant?

In the fermentation of glucose (wine making), a volume of 780 mL of \(CO_2\) gas was produced at \(37^{\circ} \mathrm{C}\) and 1.00 atm. What is the volume (L) of the gas when measured at \(22^{\circ} \mathrm{C}\) and 675 mmHg? (7.6)

Problem 103CQ When sensors in a car detect a collision, they cause the reaction of sodium azide, NaN3, which generates nitrogen gas to fill the airbags within 0.03 s. How many liters of N2 are produced at STP if the airbag contains 132 g of NaN3? 2NaN3(s) ? 2Na(s)+ 3N2(g)

Problem 104CQ Ammonia reacts with oxygen to produce nitrogen oxide and water. How many liters of nitrogen oxide at STP are produced from the reaction of 50. g of NH3? (7.7, 7.8) 4NH3(g) + 5O2(g) ? 4NO(g) + 6H2O(g)

Problem 105CQ A 1.00-g sample of dry ice (CO2) is placed in a container that has a volume of 4.60 L and a temperature of 24 °C. What is the pressure of CO2, in mmHg, inside the container after all the dry ice changes to a gas? (7.8) CO2(s) ? CO2(g)

Problem 106CQ A 250-mL sample of nitrogen (N2) has a pressure of 745 mmHg at 30. °C. What is the mass, in grams, of the nitrogen gas? (7.8)

Problem 107CQ Hydrogen gas can be produced in the laboratory through the reaction of magnesium metal with hydrochloric acid. When 12.0 g of Mg reacts, what volume, in liters, of H2 gas is produced at 24 °C and 835 mmHg? Mg(s) + 2HCl(aq) ? H2(g) + MgCl2(aq)

Problem 108CQ In the formation of smog, nitrogen and oxygen gas react to form nitrogen dioxide. How many grams of NO2 will be produced when 2.0 L of nitrogen at 840 mmHg and 24 °C are completely reacted? N2(g) + 2O2(g) ? 2NO2(g)

Problem 109CQ Solid aluminum reacts with H2SO4 to form H2 gas and aluminum sulfate. How many grams of Al can react when 415 mL of H2 gas is produced at 23 °C at a pressure of 734 mmHg? (7.8) 2Al(s) + 3H2SO4(aq) ? 3H2(g) + Al2(SO4)3(aq)

Problem 110CQ When heated, solid KClO3 forms solid KCl and O2 gas. When a sample of KClO3 is heated, 226 mL of O2 gas is produced with a pressure of 719 mmHg and a temperature of 26 °C. How many grams of KClO3 reacted? (7.8)