Calculate the amount of heat corresponding to the complete combustion of 7.58 moles of coal if the heat

Calculate the amount of heat corresponding to the complete combustion of 7.58 moles of coal if the heat effect of the reaction is +393 kJ.

Let us write the thermochemical equation of the coal combustion reaction:

C (coal) + O2 (g) = CO2 (g) + 393 kJ

According to this reaction equation, 393 kJ of heat is released per 1 mol of coal, therefore, when 7.58 mol of coal is burned, 7.58 * 393 = 2978.94 (kJ) = 2.98 (MJ) of heat will be released.