Week 1 Worksheet PDF

Week 1 Worksheet Review 1. What are the units for joules? 2. What is a consecutive reaction? What is an intermediate in a consecutive reaction? --------------------------------------------------------------------------------------------------------------------- Heat *Sim...

Week 1 Worksheet Review 1. What are the units for joules? 2. What is a consecutive reaction? What is an intermediate in a consecutive reaction? --------------------------------------------------------------------------------------------------------------------- Heat *Similar to Thermochemistry Postlab Calculations 3. How much heat is required to raise the temperature of 175 g of aluminum from 21.0°C to 145°C? 4. 250.0 g of hot coffee at 95.0°C are placed in a 0.2000 kg mug at 20.0°C. The specific heat of the coffee is 4.00 J/g °C, while that of the mug is 0.80 J/g °C. Assuming no heat is lost to the surroundings, what is the final temperature of the system: mug + coffee? Calorimetry 5. The complete combustion of 1 mole of nitrobenzene, C6H5NO2, in a bomb calorimeter liberates 3088 kJ of heat and increases the temperature of the calorimeter assembly by 140.0 °C. What is the heat capacity of this bomb calorimeter? A) 1.25 kJ/°C B) 4.53 kJ/°C C) 22.1 kJ/°C D) 432 kJ/°C E) 43.1 kJ/°C Enderle  6. Cyclohexanol, C6H12O, has a heat of combustion of -890.7 kcal/mol. A sample containing only 0.708 g of cyclohexanol undergoes complete combustion in a bomb calorimeter that has a heat capacity of 2.70 kcal/°C. What is the final temperature if the initial water temperature is 27.0°C? First Law of Thermodynamics 7. What is the work done (in joules) by the system when H2 expands against a constant pressure of 75 atm at 45.3°C? The change in volume is 24.0 L. A) 1.8 × 103 J B) -8.2 × 104 J C) 8.2 × 104 J D) 1.8 × 105 J E) -1.8 × 105 J Heats of Reaction: ΔU and ΔH 8. The complete combustion of propane, C3H8(g), is represented by the equation (not balanced): C3H8(g) + O2(g) → CO2(g) + H2O(l) ΔH° = -2220 kJ How much heat is evolved in the complete combustion of 12.5 L C3H8(g) at 25°C and 790 mmHg? Indirect Determination of ΔH: Hess’s Law 9. Using the heat of combustion of methanol as -726.6 kJ and the following data: C(graph) + 1/2O2 →CO(g) ΔH° = -110.5 kJ C(graph) + O2(g) →CO2(g) ΔH° = -393.5 kJ H2(g) + 1/2O2(g) →H2O(l) ΔH° = -285.8 kJ Determine ΔH° for the following reaction: CO(g) + 2 H2(g) → CH3OH(l) Enderle