Quiz 1 vA Solutions

Quiz 1
Version A
Chapter 9
1/17/14
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may want to mark your answers on this sheet. Each question is worth 2 points.
Consider a process carried out on 1.00 mol of a monatomic ideal gas by the following two
different pathways. The first pathway is A (3.00 atm, 20.0 L) to C (1.00 atm, 20.0 L) to D (1.00
atm, 50.0 L); and the second pathway is A (3.00 atm, 20.0 L) to B (3.00 atm, 50.0 L) to D (1.00
atm, 50.0 L). In each case, the gas is taken from state A to state D.
1. Calculate HABD.
A)
B)
C)
D)
E)
475 L•atm
25 L•atm
–25 L•atm
–475 L•atm
None of the above
2. Consider the following reaction:
2SO2(g) + O2(g)  2SO3(g) H = –198 kJ
Calculate the energy change associated with 21.4 g of SO2 reacting with excess O2.
A)
B)
C)
D)
E)
–132 kJ
–33.1 kJ
–66.1 kJ
–4.24  103 kJ
None of the above
3. Using Hess's law and equations 1-3 below, find H° at 25°C for the oxidation of C2H5OH(l).
C2H5OH(l) + 3O2(g)  3H2O(l) + 2CO2(g)
1.
2.
3.
A)
B)
C)
D)
E)
C2H4(g) + 3O2(g)  2CO2(g) + 2H2O(l)
C(graphite) + 3H2(g) + (1/2)O2(g)  C2H5OH(l)
C2H4(g) + H2O(l)  C2H5OH(l)
H° = –1411 kJ
H° = –278 kJ
H° = –44 kJ
–1367 kJ
44 kJ
632 kJ
–1742 kJ
None of the above
4. Calculate
(kJ) for the following reaction from the listed standard enthalpies of formation:
4NH3(g) + 5O2(g)
4NO(g) + 6H2O(g)
Substance
NH3(g)
NO(g)
H2O(g)
A)
B)
C)
D)
E)
-46
90.
-242
-1276 kJ
-862 kJ
-908 kJ
Not enough information
None of the above
5. In a system composed of nitrogen gas in a cylinder fitted with a piston, when 2.00 kJ of energy is
transferred into the system as heat at an external pressure of 2.00 atm, the nitrogen gas expands
form 2.00 L to 5.00 L against this constant pressure. What is E for the process?
A)
B)
C)
D)
E)
+1.39 kJ
0
+2.61 kJ
-0.608 kJ
None of the above
6. 75.0 mL of a pure liquid at 245 K is mixed with 100.0 mL of the same pure liquid at 365. K. What
is the final temperature of the mixture?
A) 305 K
B) 314 K
C) 295 K
D) 325 K
E) None of the above

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