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Molar heat capacity of aluminium is 25 J...

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

A

1.5 kJ

B

0.5 kJ

C

1.0 kJ

D

2.5 kJ

Text Solution

Verified by Experts

The correct Answer is:
C
`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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