Determine the change in temperature of water, the mass of which is 15 kg, if energy is transferred

| September 6, 2021 | education

Determine the change in temperature of water, the mass of which is 15 kg, if energy is transferred to it, which is released during the combustion of 15 kg of kerosene.

1). Let us find the amount of heat released during combustion m = 15 g = 0.015 kg of kerosene according to the formula: Q = q • m, where the specific heat of combustion of kerosene q = 46 MJ / kg, Q = 15 kg • 46 MJ / kg = 0.69 MJ … We will assume that all the heat released during the combustion of kerosene is transferred to the water.
2). To calculate how much heat the water should receive when heated, we use the formula: Q = m • c • Δt. Water mass m = 15 kg. Specific heat capacity of water c = 4200 J / (kg • deg). Let us express the change in steam temperature Δt = Q: (m • s), Δt = 690000 J: (15 kg • 4200 J / (kg • deg)), Δt = 10.95 deg ≈ 11 deg.
Answer: ≈ 11º.



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