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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=mC_P DeltaT`
`Delta Q=100xx10^(-3)xx4184 x× 20 = 8.4xx10^3`
`DeltaQ=8.4 KJ, DeltaW=0`
`DeltaQ=DeltaU=8.4kJ`.
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