1. What is the law of conservation of mass? 2. 5 grams of a metal is heated to 100°C and placed in 30 grams of water at 10°C. The final temperature of the water is 24.5°C. What is the specific heat capacity of the metal? Hint: Heat Capacity for water is 4.184 J/gK 3. 12.8 grams We also discuss several other topics like phys 2210
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of iron was placed in 42.1 grams of water at 20°C. If the final temperature of the water was 50°C, what was the initial temperature of the iron? Note that the Heat Capacity for iron is 0.450 J/g°C 4. Which had a bigger temperature change in the problem above? Water or iron or were they the same? 5. If you are going from a gas straight to a solid what is it called?6. What is the heat absorbed as 372 grams of ice at -10°C is raised to 90°C? Note that the heat of fusion of water is 334.16 J/g and the heat of evaporation is 2.26 kJ/g. 7. Which is a state function: Distance travelled, time to drive, or change in enthalpy? 8. What is the change in enthalpy for the following reaction: N2 + 2O2 ----> 2NO2 given N2 + O2 --- 2NO H= 181 kJ 2NO + O2 ----> 2NO2 H= -131 9. What is the enthalpy of the following reaction given the enthalpy of formation for ZYX is 10 kJ, 30 kJ for ZX, and 33 kJ for XY. 3XY + 4ZX -----> 6ZYX