Practice:
Q 1,:Consider the reaction: 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)
ΔHs(kJ/mol) -45.9 0 91.3 -241.8
ΔS(J/mol.K) 192.8 205.2 210,8 188.8
Calculate ΔH at 250C and determine whether the reaction is spontaneous.
Q 2:The following data were collected for the reaction: CH3Cl(g) + 3Cl2(g) → CCl4(g) + 3HCl(g)
Experiment |
Initial [CH3Cl] (M) |
Initial [Cl2] (M) |
Initial rate (M/s) |
1 |
0.05 |
0.05 |
0.014 |
2 |
0.1 |
0.05 |
0.028 |
3 |
0.2 |
0.1 |
0.112 |
Q 3:Consider the reaction: N2(g) + O2(g) → 2NO(g) at 20000C, KC = 0.1.
a) If a reaction mixture initially contains 0.1M N2, 0.2M O2.What are the equilibrium concentrations of NO, N2, O2? Calculate KP.
b) Increasing pressure, how will the following changes affect the equilibrium?
Q 4:Calculate ΔH for the equation: 4Al(s) + 3MnO2(s) → 2Al2O3(s) + 3Mn(s) using the following data:
2Al(s) + 3/2O2(g) → Al2O3(s); ∆H0 = -1676 kJ (1)
Mn(s) + O2(g) → MnO2(s); ∆H0 = -520 kJ (2)
Q 5:
5.1. Rank each of substances in order of increasing standard molar entropy (S0):
(1)CH4(g) (2) CCl4(g) (3) H2(g)
A. (1), (2), (3) B. (2), (3), (1) C. (3), (1), (2)
5.2.For which of the following would you expect the entropy change to be positive?
A. 2 KClO3(s) → 2 KCl(s) + 3 O2(g) B. CH2=CH2(g) + H2(g) → CH3CH3( g)
C. Na(s) + ½Cl2(g) → NaCl(s) D. N2(g) + 3 H2(g) → 2 NH3(g)
5.3. Calculate ΔH at 298K for PbCl2(s) from the following information.
C8H18(l) + 25/2O2(g) → 8CO2(g) + 9H2O(g)
-250.1 0 91.3 -241.8
A. -1195.7 kJ B. 99.6 kJ
C. 1195.7 kJ D. -99.6 kJ
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