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The molar heat capacity of Al is 24 J mo...

The molar heat capacity of Al is `24 J mol^(-1) K^(-1)`. The energy required to raise the temperature of 60.0g of Al from `25^(@)C` to `45^(@)C` is

A

3.2 kJ

B

1.07 kJ

C

10.1 kJ

D

2.40 kJ

Text Solution

Verified by Experts

The correct Answer is:
B
Rise in temperature = `45^(@) - 25^(@) = 20^(@)C`
Mass of Al = 60 g
Molar heat capacity of Al = `24 JK^(-1) mol^(-1)`
Specific heat capacity of Al,
`C = (24)/(27) = 0.889 JK^(-1) g^(-1)`
Energy required = `m xx c xx Delta T`
`= 60 xx 0.889 xx 20`
= 1066.8 or = 1.07 kJ
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