Determine the mass of an iron bar taken at the melting temperature, if 54 kJ of energy is needed for melting?
| November 29, 2020 | education
We need a formula:
Q = lm (instead of l lambda)
l-constant, this is the specific heat of fusion. l iron is 27 × 10 ^ 4 J / kg. Let’s convert 54 kJ to 5.4 × 10 ^ 4 J for an easier calculation. We substitute.
m = Q / l = 5.4 × 10 ^ 4 J / 27 × 10 ^ 4 J / kg = 0.2 kg
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