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H2 + 1/2 O2 --> H2O ΔHc = -283,8kj
2C + 3H2 --> C2H6. ΔHf = 226,7kj
2CO2 --> 2C + 2O2. ΔH = 787 kj
H2O --> H2 + 1/2O2. ΔH = 283,8 kj
2C + 3H2 --> C2H6. ΔH. = 226,7kj
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2CO2 + H2O --> C2H6 + 5/2 O2 ΔH = 1297,5kj