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

Chemistry: Principles and Practice
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Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
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Chapter5: Thermochemistry
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Problem 5.27QE
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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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So, when there is no value given for a substance O2, you are to assume that it is zero? 

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