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

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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 Option: D

Thermal capacity = ms = 40 × 0.2 = 8 cal/°C
= 4.2 × 8 J = 33.6 joules/°C