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Coefficient of performance, Cop = T2/(T1 − T2).

1. 5 = 273 − 20/253
2. T1 − (273 − 20)/T1 − 253
3. 5T1 − (5 × 253) = 253
4. T1 = 303.6 − 273 = 31°C

Correct answer: 5T1 − (5 × 253) = 253

Solution

The coefficient of performance (COP) equation is given as Cop = T2 / (T1 − T2). Rearranging the terms in the equation leads to the form 5T1 − (5 × 253) = 253, which matches option C.

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