How much heat will be released during the combustion of a fuel mixture consisting of 4 kg of dry wood and 2 kg of charcoal?

Initial data: m1 (mass in a mixture of dry wood) = 4 kg; m2 (mass in charcoal mixture) = 2 kg.

Reference values: q1 (specific heat of combustion of dry wood) = 10 MJ / kg = 10 * 10 ^ 6 J / kg; q2 (specific heat of combustion of charcoal) = 34 MJ / kg = 34 * 10 ^ 6 J / kg.

The amount of heat that will be released during the combustion of this fuel mixture: Q = Q1 + Q2 = q1 * m1 + q2 * m2.

Let’s perform the calculation: Q = 10 * 10 ^ 6 * 4 + 34 * 10 ^ 6 * 2 = (10 * 4 + 34 * 2) * 10 ^ 6 = 108 * 10 ^ 6 J = 108 MJ.