How much heat will be released during the complete combustion of dry birch firewood weighing 1.5 m?
| April 8, 2021 | education
V = 1.5 m3.
ρ = 550 kg / m³.
q = 1 * 10 ^ 7 J / kg.
Q -?
The amount of heat Q that is released during fuel combustion is determined by the formula: Q = q * m, where q is the specific heat of combustion of a given fuel, m is the mass of the burned fuel.
We find the mass of birch firewood that has burned down by the formula: m = V * ρ, where V is the volume of firewood, ρ is the density of dry birch.
Q = q * V * ρ.
Q = 1 * 10 ^ 7 J / kg * 1.5 * 10 -³ m3 * 550 kg / m³ = 825 * 10 ^ 4 J.
Answer: when dry birch firewood is burned, Q = 825 * 10 ^ 4 J of thermal energy is released.
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