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Use the following data to calculate the standard enthalpy of formation of ethane, C2H6 (g). 2 C2H6 (g) + 7 O2(g) → 4 CO2 (g) + 6 H2O(ℓ)     ΔH° = -3119.6 kJ/mol 2 H2 (g) + O2 (g) → 2 H2O(ℓ )     ΔH° = -571.6 kJ/mol ΔHf° of CO2 (g) = -393.5 kJ/mol