Use data from the table below to calculate the equilibrium constants at 25?C for

Question

Use data from the table below to calculate the equilibrium constants at 25?C for each reaction.

Standard Thermodynamic Quantities for Selected Substances
at 25?C

Part A

2NO(g)+O2(g)?2NO2(g)

Express your answer using two significant figures.

Part B

2H2S(g)?2H2(g)+S2(g)

Express your answer using two significant figures.

Substance ?H?f(kJ/mol) ?G?f(kJ/mol) S?(J/mol?K) H2(g) 0 0 130.7 N2(g) 0 0 191.6 O2(g) 0 0 205.2 NO(g) 91.3 87.6 210.8 CO(g) -110.5 -137.2 197.7 CO2(g) -393.5 -394.4 213.8 H2S(g) -20.6 -33.4 205.8 S2(g) 128.6 79.7 228.2

Explanation / Answer

Part B:

?G° = (Total ?Gf)p- (Total ?Gf)r

= 0+79.7 - 2×(-33.4) = 146.5 kj/mol

?G° = -R×T×lnK

146.5 = -8.314×298×lnK

K = 2.1×10-26

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