During the combustion of coal, an amount of heat was released equal to 54 MJ. What is the mass of coal?

Formula for finding the amount of heat released during fuel combustion:

Q = q × m

Therefore, the formula for finding the mass of fuel by the amount of released heat is derived from it:

m = Q / q

To solve the problem, it is necessary to know the specific heat of combustion of coal. This table value:

q = 34,000,000 J / kg

Substitute the values into the formula, converting all units of measurement to the SI system:

1 MJ = 1,000,000 J

54 MJ = 54,000,000 J

m = 54,000,000 J / 34,000,000 J / kg

m = 54/34

m = ~ 1.6 kg

Answer: m = ~ 1.6 kg