How many degrees will 50 liters of water be heated by the energy obtained from burning 1 kg of dry firewood?
| February 1, 2021 | education
Q1 (water heating) = Q2 (dry wood burning).
Q1 = C * m1 * Δt, where C (specific heat capacity of water) = 4200 J / (K * kg), m1 (mass of water for heating) = 50 l (50 liters of water have a mass of 50 kg), Δt (temperature change) …
Q = q * m2, where q (specific heat of combustion of dry wood) = 1 * 10 ^ 7 J / kg, m2 (mass of burned wood) = 1 kg.
С * m1 * Δt = q * m2.
Δt = q * m2 / (С * m1).
Let’s calculate: Δt = 1 * 10 ^ 7 * 1 / (4200 * 50) = 47.62 ºС.
Answer: 50 liters of water will heat up to 47.62 ºС.
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