Calculate the standard free-energy changes for the following reactions at 25°C. CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) 2MgO(s) → 2Mg(s) + O2(g)   Inorganic Substances Substance ΔHo (kJ/mol) f ΔGo (kJ/mol) f So (J/K·mol) CO(g) -110.5 -137.3 197.9 CO2(g) -393.5 -394.4 213.6 H2(g) 0 0 131.0 H2O(l) -285.8 -237.2 69.9 O2(g) 0 0 205.0 Organic Substances CH4(g) -74.85 -50.8 186.2 Mg(s) 0 0 32.5 MgO(s) -601.8 569.6 26.78

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Calculate the standard free-energy changes for the following reactions at 25°C.

CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)

2MgO(s) → 2Mg(s) + O2(g)

 

Inorganic Substances

Substance

ΔHo (kJ/mol)

f

ΔGo (kJ/mol)

f

So (J/K·mol)

CO(g)

-110.5

-137.3

197.9

CO2(g)

-393.5

-394.4

213.6

H2(g)

0

0

131.0

H2O(l)

-285.8

-237.2

69.9

O2(g)

0

0

205.0

Organic Substances

CH4(g)

-74.85

-50.8

186.2

Mg(s)

0

0

32.5

MgO(s)

-601.8

569.6

26.78

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