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 27gmol^(-1)) from 30^(@)C to 50^(@)C is

Answer»

1.5 KJ
0.5 kJ
1.0 kJ
2.5 kJ

Solution :`Q=nCDeltaT, n=(54)/(27)=2`
`=2xx25xx20=1000 J`
Q=1.0 kJ.


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