During the combustion of 250 g of some fuel, 10 MJ of heat was released. What kind of fuel burned?

m = 250 g = 0.25 kg.
Q = 10 MJ = 10 * 10 ^ 6 J.
λ -?
The amount of thermal energy 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 substance, m is the mass of the fuel that has burned.
Let’s find the specific heat of combustion of the substance: λ = Q / m.
λ = 10 * 10 ^ 6 J / 0.25 kg = 40 * 10 ^ 6 J / kg.
According to the table of specific heat of combustion of substances, it can be seen that λ = 40 * 10 ^ 6 J / kg has fuel oil.
Answer: fuel oil burned out.