Calculate the number of kj of heat necessary to raise the temperature of 60 g of aluminium from 35°C to 55°C. Molar heat capacity of Al is 24 J mol-1 K-1.
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No. of moles of Al (m) = (60g)/(27 g mol-1)
= 2.22 mol
•Molar heat capacity (C) = 24 J mol-1 K-1.
•Rise in temperature (∆T) = 55 – 35 = 20°C = 20 K
•Heat evolved (q) = C x m x T
By calculating ,
= (24 ) x (2.22) x (20 K)
= 1065.6 J
= 1.067 kj
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