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# Chapters 4-7 Test Study Guide Questions Chem 111-003

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This 3 page Study Guide was uploaded by Sharneece Gary on Friday October 16, 2015. The Study Guide belongs to Chem 111-003 at University of South Carolina taught by Dmitry V Peryshkov in Fall 2015. Since its upload, it has received 54 views.

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Date Created: 10/16/15

Chapters 47 Test Study Guide Questions amp 8182 1 Calculate the enthalpy change when 110g of C02 form from the combustion of propane C3H8 C3H8 g 502 g 9 3C02 g 4H20 I AH 222 x 10quot3 kJ 110g C02 x 1mol44gC02 025 mol C02 025 mol C02 x 222x10quot3kJ 3 mol C02 0185 x 10quot3 kJ 185kJ 2 Give the thermochemical equations and their corresponding enthalpies 2C2H2 g 502g 9 4C02g 2H20 l AH 1692 2C6H6 l 15 02g 9 12C02 g 6H20l AH 6339 kl What is the AH for the following reaction 3C2H2g C6H6 I 1 x everything by 15 3c2h2 15202 9 6C02 3H20 AH 2538 k 2 divide evevrything by 2 6C02 3H20 9 C6H6 152 02 AH 3170 k 2538 3170 632 k 3 What mass of ethane gas C2H6 must burn in excess oxygen to produce 200 x 10quot3 k of heat given the thermochemical equation 2C2H6g 702g 9 4C02g 6H20l AH 312 x 10quot3 k n x 312 x 10quot3 Zmol 200 x 10quot3 2000 x 2 3120 128 moles x 3008g1mol 385g 4 Given the data below what is AH for the following reaction P4010S 6H20G 9 4H3P0S SUBSTANCE AH f kJmol P4010S 1640 H20g 242 H3P04 1279 Step 1 Know the formula n x AHfo product m x AHfo reactants Note n amp m are the coefficients Step2 plug in numbers 4mo x 1279 kJmol 1mol x 1640 kJmol 6mo x 242 kJmol 5116 k 3092 k 2024 k 5 A sample of a gas occupies 40L at 25 degrees C and 20 atm of pressure Calculate the volume at STP T 0 degrees C P 1 atm Step 1 find out all the information you have and need in this case you don t need the n or r so just disregard it P 20 atm p 1 atm V 40 L V T 273 25 298 K t 273 K Temperature is to be recorded in Kelvin To convert from Celsius to Kelvin add 273 to the Celsius temperature Step 2 set up formulat and solve for v PVT pvt 9 PVtTp v 20 atm x40 L x273 K 298 K x 1 atm v 2184298v 1329L 6 Calculate the partial pressure of Ar gas in a container that contains 23 mol of Ar and 11 mol of Ne and is at a total pressure of 14 atm Step 1 Apply the mole fraction Xar Xar Xne 2323 11 2334 676 Step 2 Take the mole fraction and multiply it by the total pressure 676 mol x 14atm 7 What volume in milliliters of hydrogen gas at 133 atm and 33 degrees Celsius is produced by the reaction of 0223 g of lithium metal with excess water The other product is LiOH 2Li 2H20 H2 2LiOH 00223g Li x 1mol 6941 0003 mol 0003 mol x 1mol H2 2 mol Ll 00016 mol H2 V 00016 x 008206 x 306133 V 0030328 3033 mL 8 For each of the following subshells give the value of the n and the L quantum numbers a Zs b 3d c 4p a n2 L0 n3 L2 c n4 L1 9 The ground state electron configuration 152 252 2p6 3sZ 3p2 would be correct for which species listed below A Al B P C Si D S E None of these C 10 What is the molar concentration of sodium uoride in a solution prepared by dissolving 251g of NaF in enough water to form 2000 mL of solution Step 1 You know that molarity is molL so you want to convert the 251 grams to moles 251g NaF X lMol420NaF 00598 mol NaF 420 NaF came from the periodic table Step 2 convert 200 mL into Liters by moving the decimal 3 places to the left 200ml 200L Step 3 Put the moles over liters to nd the molar concentration 00598 mol NaF 200L 0299 molL 11 Calculate the molar mass of a gas if a 102 g sample occupies 220 mL at 95 degrees Celsius and a pressure of 750 torr Step 1 find out all the information you have and need P 750 torr 760 0987 atm V 220 mL 220 L n R 008206 T 95 273 368 K Step 2 Set up formula and solve for n PVnRT 9 PVRT n 987 x 220 008206 x 368 n 0217 30198 n 0007 19 mol n Step 3 Molar mass massmoles 102 g 000719mo 142 gmol 12 How may valence electrons does Fe have Fe Ar 452 3d6 Valence electron 8 13 Write the electron configuration of Co 3 Co Ar 452 3d7 Coquot3 Ar 3d6

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