How much charcoal is needed to generate 20 kJ of heat?

univerkov | September 22, 2021 | education

Given: Q (heat that should be released from burning charcoal) = 20 kJ (20 * 10 ^ 3 J).

Constants: q (specific heat of combustion of charcoal) = 3.4 * 10 ^ 7 J / kg.

We express the required mass of charcoal to obtain 20 kJ of heat from the formula: Q = q * m, whence m = Q / q.

Let’s calculate: m = 20 * 10 ^ 3 / (3.4 * 10 ^ 7) = 5.88 * 10 ^ -4 kg = 0.588 g.

Answer: To obtain 20 kJ of heat, 0.588 grams of charcoal is needed.

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