1.

Molar heat capacity of aluminium is 25 JK^(-1) mol^(-1). The heat necessary to raise the temperature of 54 g of aluminium (atomic mass 27 g mol^(-1)) from 30^(@)C to 50^(@)C is

Answer»

1.5 kJ
0.5 kJ
1.0 kJ
2.5 kJ

Solution :`Q = nC Delta T`
`N = (54)/(27) = 2 MOL`,
`Delta T = 50 - 30 = 20^(@)`
`Q = 2 mol xx 25 JK^(-1) mol^(-1) xx 20 K`
= 1000 J = 1.0 kJ


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