83. Solving a chemistry problem

83. Solving a chemistry problem

3. Calculate the heat of formation of methane if the heat of combustion is 212 kcal The heat of combustion of carbon and hydrogen, respectively, are:
a) C O2 = CO2 97.8 kcal;
b) 2H-2 O2 \u003d 2H2O 2 * 68.4 kcal

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