What mass of anthracite was burned if it received an amount of heat of 60 MJ?
| February 17, 2021 | education
The amount of heat that will be released during the complete combustion of anthracite coal is calculated using the following formula:
Q = q * m, where Q is the amount of heat obtained (Q = 60 MJ = 60 * 10 ^ 6 J), q is the specific heat of combustion of anthracite (let us assume q = 3 * 10 ^ 7 J / kg), m is the desired mass burnt anthracite (m = 100 kg).
The sought mass of burnt anthracite is:
m = Q / q = 60 * 10 ^ 6 / (3 * 10 ^ 7) = 2 kg.
Answer: They burned 2 kg of anthracite.
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