How much more heat is released as a result of the complete combustion of gasoline

univerkov | May 4, 2021 | education

How much more heat is released as a result of the complete combustion of gasoline with a mass of 7 kg in comparison with the complete combustion of coal of the same mass.

Data: m = m1 (mass of gasoline) = m2 (mass of coal) = 7 kg.

Reference values: q1 (specific heat of combustion of gasoline) = 4.6 * 10 ^ 7 J / kg; q2 (specific heat of combustion of coal) = 2.7 * 10 ^ 7 J / kg.

The difference in the amount of heat obtained from the combustion of gasoline and coal is determined by the formula: ΔQ = q1 * m1 – q2 * m2 = m * (q1 – q2).

Calculation: ΔQ = 7 * (4.6 * 10 ^ 7 – 2.7 * 10 ^ 7) = 13.3 * 10 ^ 7 J (133 MJ).

Answer: With complete combustion of gasoline, 133 MJ more heat will be released.

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