How much firewood do you need to burn to get the same amount of heat as when burning 2 kg of gasoline?

As we know, in order to determine the amount of heat that will be released during the combustion of a substance, it is necessary to use the formula known from the school curriculum:

Q = m * q, where q is, in fact, the specific heat of combustion of the selected substance.

Let’s determine what value the amount of heat will equal, what will be released if 2 kilograms of gasoline burns:

qben = 4.6 * 10 ^ 7 J / kg;

2 * 4.6 * 10 ^ 7 = 9.2 * 107.

Let’s determine how much dry firewood you need to burn:

qdr = 1 * 10 ^ 7 J / kg;

9.2 * 10 ^ 7: 1 * 10 ^ 7 = 9.2.

Answer: 9.2 kg.