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100g of water is heated from 30^@C to 50...

100g of water is heated from `30^@C to 50^@C`. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is `4184J//kg//K`):

A

`4.2 kJ`

B

`8.4 KJ`

C

`84 kJ`

D

`2.1 kJ`

Text Solution

Verified by Experts

The correct Answer is:
B
Since there is no expansion W=0
`triangleU=Q`
`=ms triangleT= (100)/(1000)xx 4184x20= 84KJ`.
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