Given the following data:    2C2H6 (g) + 7O2 (g) ------> 4CO2 (g) + 6H2 (g)             ΔH= -3120kJ C (s) + O2 (g) -----> CO2 (g)                                          ΔH= -394kJ 2H2 (g) + O2 (g) ----->  2H2O (l)                                     ΔH= -572kJ Use Hess’s law to calculate ΔH for the reaction: 2C(s) + 3H2 (g) -----> C2H6 (g)   ΔH= Answer.................. kJ

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