For the complete melting of a bar of iron at a temperature of 1535 ° C, 135 kJ of energy was expended.
| August 9, 2021 | education
For the complete melting of a bar of iron at a temperature of 1535 ° C, 135 kJ of energy was expended. what is the mass of the bar.
The iron bar has a temperature of 1535 ºС, which is the melting temperature for iron, therefore additional heating was not required and the energy expended was only spent on the smelting process.
Q = λ * m, where Q = 135 kJ = 135 * 10 ^ 3 J, λ is the specific heat of fusion of iron (λ = 2.7 * 10 ^ 5 J / kg), m is the mass of the iron bar.
m = Q / λ = 135 * 10 ^ 3 / (2.7 * 10 ^ 5) = 0.5 kg.
Answer: The mass of the iron bar is 0.5 kg.
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