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Calculate the change in internal energy ...

Calculate the change in internal energy of `3 .0` mol of helium gas when its temperature is increased by `2. 0 K`.

A

`64.8 J`

B

`54.9 J`

C

`84.8 J`

D

`74.8 J`

Text Solution

Verified by Experts

The correct Answer is:
D
Helium is a monatomic gas. Internal energy of (n) moles of the gas is
`U = 3/2 nRT`
`:. Delta U = 3/2 nR (Delta T)`
Substituting the values,
`Delta U = (3/2)(3) (8.31)(2.0)`
= `74.8 J`.
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