What mass of birch firewood burned out if 104 MJ of energy was released?

univerkov | January 11, 2021 | education

These tasks: Q (thermal energy from the combustion of the desired mass of firewood) = 104 MJ (104 * 10 ^ 6 J).
Reference values: q (specific heat of combustion of birch wood) = 13 MJ / kg = 13 * 10 ^ 6 J / kg.
The desired mass of birch firewood can be calculated by the formula: m = Q / q.
Calculation: m = 104 * 10 ^ 6 / (13 * 10 ^ 6) = 8 kg.
Answer: To obtain 10 ^ 4 MJ of thermal energy, 8 kg of birch firewood was burned.

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