2CH4(g) → C2H6(g) + H2(g)      ΔHrxn = ?        Calculate ΔHrxn using the data below.   Include negative sign if appropriate.                                                                                     ΔHrxn (kJ)       H2(g) + ½ O2(g) → H2O(ℓ)                                 -285.8        CH4(g) + 2O2(g) → CO2(g) +2H2O(ℓ)                  -890.4 C2H6(g) + 7/2 O2(g) → 2CO2(g) + 3H2O(ℓ)              -1559.9

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