Calculate the standard molar entropy change for the combustion of methane. CH4(g

Question

Calculate the standard molar entropy change for the combustion of methane. CH4(g) + 2 O2(g) rightarrow CO2(g) + 2 H2O(g) Write a balanced chemical equation for the overall reaction represented by the cell notation below. Pt 1 Sn2+(aq), Sn4+(aq) || Cd2+(aq) | Cd(s) If a process is endothermic and spontaneous, which of the following must be true? Calculate E for the following electrochemical cell at 25 degree C Ag | Ag+(aq, 0.150 M) || Sn2+(aq, 0.500 M), Sn4+(aq, 0.500 M) | Pt given the following standard reduction potentials. Ag+(aq) + e- rightarrow Ag(s) E degree = +0.80 V Sn4+(aq) + 2 e- rightarrow Sn2+(aq) E degree = +0.14 V

Explanation / Answer

1) delta S = 2 x 188.8 + 213.7 - (2 x 205.1 + 186.3) = -5.2 J/mol K

2) b) Cd2+ + Sn2+ ----> Cd + Sn4+

3) d) delta H < 0 and delta S >0

4) -0.915 V

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