How much anthracite must be burned in order to obtain an amount of heat of 60 MJ?

univerkov | June 18, 2021 | education

Initial data: Q (the amount of heat obtained by burning anthracite) = 60 MJ = 60 * 10 ^ 6 J.

Reference data: q (specific heat of combustion of anthracite) = 30 * 10 ^ 6 J / kg.

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

Let’s calculate: m = 60 * 10 ^ 6 / (30 * 10 ^ 6) = 60/30 = 2 kg.

Answer: 2 kilograms of anthracite was burned.

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