We can use Hess's law to calculate enthalpy changes that
Chapter , Problem 104AE(choose chapter or problem)
Problem 104AE
We can use Hess's law to calculate enthalpy changes that cannot be measured. One such reaction is the conversion of methane to ethylene:
2 CH4(g) — C2H4(g) + H2(g)
Calculate the AH° for this reaction using the following thermochemical data:
CH4(g) + 2 02 (g) — C02(g) + 2 H2O(0 AH° = -890.3 kJ
C2H4(g) + H2(g) — C2H6(g) AH° = -136.3 kJ
2 H2(g) + 02(g) — 2 H2O(0 AH° = -571.6 kJ
2 C2H6(g) + 7 02(g) -»■ 4 C02(g) + 6 H20(/) AH° =-3120.8 kJ
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