1. For the reaction 3H2(g) + N2(g) ⇔ 2NH3(g) ∆H < 0, the best set of conditions to produce more product are:
A. high temperature and low pressure
B. low temperature and high pressure
C. low temperature and low pressure
D. high temperature and high pressure
2.Consider the following constant expression: Keq = [CO2]. Which one of the following equilibrium systems does the above expression represent?
A. CO2(g) ⇔CO2(s)
B. PbO(s) + CO2(g) ⇔ PbCO3(s)
C. CaCO3(s) ⇔ CaO(s) + CO2(g)
D. H2CO3(aq) ⇔ H2O(l) + CO2(aq)
3.For which of the following would you expect the entropy change to be positive?
A. HCl (g) + NH3(g) ⇔ NH4Cl(s)
B. 2SO2(g) + O2(g) ⇔ 2SO3(g)
C. CaCO3(s) ⇔ CaO(s) + CO2(g)
D. N2(g) + 3H2(g) ⇔ 2NH3(g)
4. Calculate Δ Gf at 298K for PbCl2(s) from the following information. Δ G°for the reaction below is -58.4kJ at 298K.
PbS(s) + 2HCl(g) → PbCl2(s) + H2S(g)
Δ Gf (kJ/mol) -98.7 -95.3 ? -33.6
A. -16.0 kJ/mol
B. -314.1 kJ/mol
C. -47.6 kJ/mol
D. -36.2 kJ/mol
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