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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
`DeltaQ = M, S, DeltaT`
`= 100 xx 10^(-3) xx 4.184 xx 20`
`= 8.4 xx 10^(3)`
`DeltaQ = 8.4 kJ, DeltaW = 0`
`DeltaQ = Deltau +DeltaW`
`:. Deltau = 8.4 kJ`.
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