Determine how many times more heat will be released when burning 5 kg of gasoline than when burning 5 kg of peat.
| September 2, 2021 | education
mb = 5 kg.
qb = 4.6 * 10 ^ 7 J / kg.
mt = 5 kg.
qt = 1.4 * 10 ^ 7 J / kg.
Qb / Qt -?
The amount of thermal energy Q, which is released during fuel combustion, is determined by the formula: Q = q * m, where q is the specific heat of combustion of the fuel, m is the mass of the fuel that has burned.
We take the specific heat of combustion of gasoline and peat from the table of specific heat of combustion of fuel qb = 4.6 * 10 ^ 7 J / kg, qt = 1.4 * 10 ^ 7 J / kg.
Qb = 4.6 * 10 ^ 7 J / kg * 5 kg = 23 * 10 ^ 7 J.
Qt = 1.4 * 10 ^ 7 J / kg * 5 kg = 7 * 10 ^ 7 J.
Qb / Qt = 23 * 10 ^ 7 J / 7 * 10 ^ 7 J = 3.3.
Answer: when gasoline is burned, 3.3 times more heat will be released than when peat is burned: Qb / Qt = 3.3.
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