Quiz Chapter 5 A
Name _________________________
2pts 1. Is work a state function? Explain.
2pts 2. A gas piston absorbs 23 kJ of heat from its surroundings and does 12 kJ of work. What is
the DE for the gas?
2pts 3. A 23.1 g sample of ethanol was warmed from 25.00 to 27.34 oC by absorbing 132 J of
heat. What is the specific heat of ethanol?
2pts 4. Find the standard enthalpy change (DHoRx) for the reaction below. Use the tabulated
standard enthalpies of formation values in the appendix of your text.
12NH3(g) + 21O2(g) ---> 8HNO3(aq) + 4NO(g) + 14H2O(g)
2pts 5. Given the gas phase reactions:
a) NO + O3 ® NO2 + O2DH = -198.9 kJ
b) O3 ® 3/2O2 DH = -142.3 kJ
c) O2 ® 2O DH = 495.0 kJ
Determine the DH for the reaction: NO + O ® NO2