Question

How much heat is evolved when 2 moles of methane (CH4) is burned according to this equation? CH4(g) + 2O2(g) CO2(g) + 2H2O(l) Hcomb = -890 kJ/mol. . a. -1780 kJ. b. 445 kJ. c. 1780 kJ. d. 27,400 kJ

Answer 1

To calculate the amount of heat evolved when 2 moles of methane that is burned, we use the value of the heat of combustion and multiply it by the number of moles. We calculate as follows:

Heat = 2 mol ( - 890 kJ/mol) = -1780 kJ -------> OPTION A