What amount of heat is released during the complete combustion of charcoal weighing 15kg? Alcohol weighing 200g?

The amount of heat that will be released during the combustion of fuel:
Q = q * m, q – specific heat of combustion (J / kg), m – fuel mass (kg).
The released heat for alcohol weighing 200 g (0.2 kg):
Q2 = q2 * m2, q2 = 27 * 10 ^ 6 J / kg.
Q2 = 27 * 10 ^ 6 * 0.2 = 5.4 * 10 ^ 6 J = 5.4 MJ.
The released heat for charcoal weighing 15 kg:
Q1 = q1 * m1, q1 = 34 * 10 ^ 6 J / kg.
Q1 = 34 * 10 ^ 6 * 15 = 510 * 10 ^ 6 J = 510 MJ.
Answer: When burning alcohol, 5.4 MJ of heat will be released, charcoal – 510 MJ.