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14/12/2020 12:18 pm
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The heat produced by burning of cow dung cake of mass 210 g raised the temperature of 50 g of water by 2°C. Assuming that all the heat was utilized for heating water whose specific heat capacity is 4.2 J/g °C, calculate the calorific value of the dung cake.
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14/12/2020 12:19 pm
Mass of cow dung = 210 g
Mass of water, m = 50 g
Specific heat of water, s = 4.2 J/g/°C
Rise in temperature, t = 2 °C
Heat produced Q = m × s × t = 50 × 4.2 × 2 = 420 Joules
Calorific value of cow dung = 420/210 = 2 J/g.