Solution of task 88 of Chemistry Book Shimanovich 2003

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88. The thermal effect of which reaction is equal to the heat of methane formation?
Calculate the heat of formation of methane, based on the following thermochemical equations:
H2 (r) + 1 / 2O2 (r) = H2O (x); H = -285.84 kJ.
C (k) + O2 (r) = C02 (r); H = -393.51 kJ.
CH4 (r) + 2O2 (g) = 2H2O (g) + CO2 (g); H = -393.51 kJ.

Answer: -74.88 kJ.

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