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    1.) Calculate the heat of combustion for the reaction in which ethane combines with oxyen to give carbon dioxide and water vapor. C2H6 + 7/2 O2 ----- 2CO2 + 3H2O
    a.) 2C(s) + 3H2(g) ----- C2H6(g) delta H = -20.2 Kcal
    b.) C(s) + O2 (g) ------- CO2(g) delta H = -94.0 Kcal
    c.) H2(g) + 1/2 O2 ----- H2O(g) delta H = -57.8 Kcal

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    https://brainmass.com/chemistry/energetics-and-thermodynamics/heat-combustion-reaction-106618

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    1.) Calculate the heat of combustion for the reaction in which ethane combines with oxygen to give carbon dioxide ...

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    It shows how to calculate the heat of combustion of ethane.

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