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Quiz #7 Chem 130 Sec 208 GSI: Andrea Geyer Please show all work or no credit will be given Name:______________________ 1) Which of the following phase changes is or are endothermic? a) Sublimation b) Vaporization c) Condensation d) Both a and b e) Both b and c f) Both a and c 2) 2CH 6 N 2(l) + 5O 2(g) 2N 2(g) + 2CO 2(g) + 6H 2 O (g) When methylhydrazine is combusted in a bomb calorimeter, the temperature of the calorimeter increases from 20.00°C to 40.60°C. In a separate experiment, the heat capacity of the calorimeter is measured to be 8.254 kJ/°C. What is the heat of reaction? q = -C cal ΔT = -8.254 kJ/°C * (40.60 – 20.00) = -1.70*10 2 kJ 3) What is the enthalpy change for the following reaction: 2C (s) + O 2(g) 2CO (g) Relevant Information: C (s) + O 2(g) → CO 2(g) ΔH = -393.5 kJ/mol 4CO (g) + 2O 2(g) → 4CO 2 ΔH = -1131.4 kJ/mol ΔH = 2(-393.5 kJ/mol) + (1131.4kJ/mol/2) = -221.3 kJ/mol 4) Indicate which 2 processes are independent of the path by which a change occurs: a. The change in potential energy when a book is transferred from table to shelf b. The heat evolved when a cube of sugar is oxidized to CO 2 (g) and H 2 O(g) c. The work accomplished by burning a gallon of gasoline

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