During the combustion of coal, an amount of heat was released equal to 54 MJ.

univerkov | May 23, 2021 | education

During the combustion of coal, an amount of heat was released equal to 54 MJ. What is the mass of coal? Specific heat of combustion of coal = 24 MJ / kg

Initial data: Q (the amount of heat released during the combustion of coal) = 54 MJ (54 * 10 ^ 6 J).

Reference values: according to the condition q (specific heat of combustion of coal) = 24 MJ / kg (24 * 10 ^ 6 J / kg).

We express the mass of coal from the formula: Q = q * m, whence m = Q / q.

Calculation: m = 54 * 10 ^ 6 / (24 * 10 ^ 6) = 2.25 kg.

Answer: 2.25 kg of coal burned out.

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