What amount of heat will be released during the combustion of peat weighing 5 kg?

Given:

m = 5 kilograms is the mass of peat;

q = 14 MJ / kg is the specific heat of combustion of peat.

It is required to determine Q (Joule) – the heat that will be released during the combustion of peat of mass m.

Since the condition of the problem is not specified, we believe that complete combustion of the fuel occurs, that is, all the released energy will go to heat.

Let’s convert units of measurement of specific heat of combustion from MJ / kg to J / kg:

q = 14 MJ / kg = 14 * 106 = 14,000,000 J / kg.

Then the released energy will be equal to:

Q = q * m = 14000000 * 5 = 70,000,000 Joules = 70 MJ.

Answer: when peat is burned, heat will be released equal to 70 MJ.