# How many times more heat will be released during the combustion of 2 kg of gasoline compared

How many times more heat will be released during the combustion of 2 kg of gasoline compared to the combustion of 2 kg of birch firewood? Specific heat of combustion of firewood 10 MJ / kg, gasoline 46 MJ / kg

mb = 2 kg.
mdr = 2 kg.

λb = 46 MJ / kg = 46 * 10 ^ 6 J / kg.

λdr = 10 MJ / kg = 10 * 10 ^ 6 J / kg.

Qb / Qdr – 7

The amount of heat Q that is released during fuel combustion is determined by the formula: Q = λ * m, where λ is the specific heat of combustion of the fuel, m is the mass of the fuel that has burned.

Qb = λb * mb, Qdr = λdr * mdr.

Qb / Qdr = λb * mb / λdr * mdr.

Qb / Qdr = 46 * 10 ^ 6 J / kg * 2 kg / 10 * 10 ^ 6 J / kg * 2 kg = 4.6.

Answer: from gasoline 4.6 times more heat will be released than from firewood.

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