THERMOCHEMISTRY QUIZ Part II

1. Given the following equations and Ho values, determine the heat of reaction (kJ) at 298 K for the reaction: N2(g) + O2(g) --> 2 NO(g)
4 NH3(g) + 5 O2(g) --> 6 H2O(l) + 4 NO(g) Ho/kJ = -6134
NH3(g) + 3O2(g) --> 2 N2(g) + 6 H2O(l) Ho/kJ = -790
a. +177
b. +89
c. -89
d. -177
e. -1403
2. Calculate the value of Ho/kJ for the following reaction using the listed thermochemical equations: CuCl2(s) + Cu(s) --> 2 CuCl(s)
Cu(s) + Cl2(g) --> CuCl2(s) Ho/kJ = -206 kJ
2 Cu(s) + Cl2(g) --> 2 CuCl(s) Ho/kJ = -36 kJ
a. -242
b. -170
c. +121
d. +170
e. +242
3. Given the following equations and Ho values, determine the heat of reaction (kJ) at 298 K for the reaction: XeF2(s) + F2(g) --> XeF4(s)
Xe(g) + F2(g) --> XeF2(s) Ho/kJ = -164
Xe(g) + 2 F2(g) --> XeF4(s) Ho/kJ = -262
a. -426
b. -213
c. -98
d. +98
e. +426
4. Calculate the value of Ho/kJ for the following reaction using the listed thermochemical equations: N2(g) + ½ O2(g) --> N2O(g)
2 NH3(g) + 3 N2O(g) --> 4 N2(g) + 3 H2O(l) Ho/kJ = -1010 kJ
4 NH3(g) + 3 O2(g) --> 2 N2(g) + 6 H2O(l) Ho/kJ = -1531 kJ
a. -489
b. -163
c. -81.5
d. +81.5
e. +163
5. Calculate Ho/kJ for the following reaction using the listed standard enthapy of reaction data: (C2H5)2O(l) --> C4H9OH(l)
C4H9OH(l)+6O2(g) --> 4 CO2(g) + 5 H2O(g) Ho/kJ=-2456.1 kJ
(C2H5)2O(l) + 6 O2(g) --> 4 CO2(g) + 5 H2O(g) Ho/kJ = -2510.0 kJ
a. -4966.1
b. -2483.1
c. -53.9
d. +53.9
e. +4966.1
6. Given the following equations and Ho values, determine the heat of reaction at 298 K for the reaction: P4(s) + 10 Cl2(g) --> 4 PCl5(g)
P4(s) + 6 Cl2(g) --> 4 PCl3(l) Ho/kJ = -1150
PCl3(l) + Cl2(g) --> PCl5(g) Ho/kJ = -111
a. +1261
b. +399
c. -399
d. -1261
e. -1594
7. Given the following equations and Ho values, determine the heat of reaction at 298 K for the reaction which occurs in a welder's acetylene torch:
2 C2H2(g) + 5 O2(g) --> 4 CO2(g) + 2 H2O(l)
H2(g) + 1/2 O2(g) --> H2O(l) Ho/kJ = -285.8
2 C(s) + H2(g) --> C2H2(g) Ho/kJ = +226.7
C(s) + O2(g) --> CO2(g) Ho/kJ = -393.5
a. -285.8
b. -571.6
c. -1574.0
d. -2145.6
e. -2599.0
8.Given the following equations and Ho values, determine the heat of reaction at 298 K for the reaction: C(s) + 2 H2(g) --> CH4(g)
C(s) + O2(g) --> CO2(g) Ho/kJ = -393.5
H2(g) + 1/2 O2(g) --> H2O(l) Ho/kJ = -285.8
CO2(g) + 2 H2O(l) --> CH4(g) + 2 O2(g) Ho/kJ = +890.3
a. +211.0
b. +74.8
c. -74.8
d. -192.2
e. -211.0
9. Calculate Ho/kJ for the following reaction using the listed standard enthapy of reaction data: 2 N2(g) + 5 O2(g) --> 2 N2O5(s)
N2(g) + 3 O2(g) + H2(g) --> 2 HNO3(aq) Ho/kJ = -414.0
N2O5(s) + H2O(l) --> 2 HNO3(aq) Ho/kJ = -86.0
2 H2(g) + O2(g) --> 2 H2O(l) Ho/kJ = -571.6
a. -42.2
b. -71.2
c. -84.4
d. -121.8
e. -243.6