For winter, dry birch firewood with a volume of 3m³ and coal with a weight of 1.5 tons were prepared.

For winter, dry birch firewood with a volume of 3m³ and coal with a weight of 1.5 tons were prepared. How much heat will be released in the furnace when the prepared fuel is completely burned in it?

These tasks: V1 (volume of harvested dry birch firewood) = 3 m3; m2 (mass of harvested coal) = 1.5 tons (in SI m2 = 1500 kg).

Reference values: ρ (density of birch firewood after air-dry drying) = 600 kg / m3; q1 (specific heat of combustion of dry birch wood) = 13 * 10 ^ 6 J / kg; q2 (specific heat of combustion of coal) = 2.7 * 10 ^ 7 J / kg.

Heat released in the furnace: Q = Q1 + Q2 = q1 * ρ * V1 + q2 * m2 = 13 * 10 ^ 6 * 600 * 3 + 2.7 * 10 ^ 7 * 1500 = 63.9 * 10 ^ 9 J ( 63.9 GJ).