Using the following equation and the standard enthalpies of formation given below, calculate the molar enthalpy of combustion (DHocomb; in kJ/mol) for ethane gas, C2H6.              2C2H6(g)  +  7O2(g)  -->  4CO2(g)  +  6H2O(g)  (DHof; kJ/mol: C2H6 = -84.0;  CO2 = -393.5, and H2O(g) = -241.8. (DHof (O2) = 0.0).          (A) -3192.8 kJ/mol          (B) -2856.8 kJ/mol          (C) -1428.4 kJ/mol          (D) -551.3 kJ/mol

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