Determine the specific heat of a substance if it is known that 85 kJ
| June 19, 2021 | education
Determine the specific heat of a substance if it is known that 85 kJ of energy is required to heat it by 50 degrees, the mass of a substance is 4 kg.
Data: Δt (temperature change of the substance during heating) = 50 ºС; Q (required amount of heat) = 85 kJ (85 * 10 ^ 3 J); m (mass of unknown substance) = 4 kg.
We express the specific heat of the unknown substance from the formula: Q = Cх * m * Δt and Cх = Q / (m * Δt).
Calculation: Cx = 85 * 10 ^ 3 / (4 * 50) = 425 J / (kg * ºС).
Answer: The specific heat capacity of the unknown substance is 425 J / (kg * ºС); most likely the unknown substance is either aluminum bronze (420 J / (kg * ºС) or manganin (420 J / (kg * ºС)).
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