How much coal must be burned to release 1.5 * 10 ^ 5 kJ of heat?
| August 13, 2021 | education
To find the desired mass of burnt coal, we use the formula: Q = qу * m, whence we express: m = Q / qу.
Variables and constants: Q – released amount of heat (Q = 1.5 * 10 ^ 5 kJ = 1.5 * 10 ^ 8 J); qу – specific heat of combustion of coal (qу = 2.7 * 107 J / kg).
Calculation: m = Q / qу = 1.5 * 10 ^ 8 / (2.7 * 10 ^ 7) = 5.56 kg.
Answer: It is necessary to burn 5.56 kg of coal.
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