How much alcohol must be burned in order to obtain the same amount of heat as when burning coal
| September 3, 2021 | education
How much alcohol must be burned in order to obtain the same amount of heat as when burning coal with a mass of 2 kg? Specific heat of combustion of coal q = 27 × 10^6 J / kg, alcohol q = 30 × 10^6 J / kg.
Problem data: m2 (mass of taken coal) = 2 kg.
Reference values: according to the condition q1 (specific heat of combustion of alcohol) = 30 * 10 ^ 6 J / kg; q2 (specific heat of combustion of coal) = 27 * 10 ^ 6 J / kg.
The desired mass of alcohol can be expressed from the equality: m1 * q1 = Q (heat due to fuel combustion) = m2 * q2 and m1 = q2 * m2 / q1.
Calculation: m1 = 2 * 27 * 10 ^ 6 / (30 * 10 ^ 6) = 1.8 kg.
Answer: You will need to burn 1.8 kg of alcohol.
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