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Thermal capacity of 40 g of aluminium (s = 0.2 cal/g K) is

1. 168 joule/°C
2. 672 joule/°C
3. 840 joule/°C
4. 33.6 joule/°C

Correct answer: 33.6 joule/°C

Solution

Thermal capacity is given by the product of mass and specific heat capacity. Here, mass = 40 g and specific heat capacity = 0.2 cal/g K. Thermal capacity = 40 × 0.2 = 8 cal/°C. Converting to joules (1 cal = 4.2 J), thermal capacity = 8 × 4.2 = 33.6 J/°C.

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