Consider the following data
Heat of combustion of H2 (g) = -241.8 kJ mol-1
Heat of combustion of C (s) = -393.5 kJ mol-1
Heat of combustion of C2H5OH (l) = -1234.7 kJ mol-1.
The heat of formation of C2H5OH(l) is (-) ____ kJ mol-1 (Nearest integer)

Answer: 278
Solution:

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