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  • Calculate the change in internal energy of  of Helium gas when its temperature

Calculate the change in internal energy of 3.0 \mathrm{~mol} of Helium gas when its temperature is increased by 2.0 \mathrm{~K}.

Option: 1

80 \mathrm{~J}


Option: 2

74.8 \mathrm{~J}


Option: 3

64 \mathrm{~J}


Option: 4

80.3 \mathrm{~J}


Answers (1)

best_answer

Helium is a mono atomic gas . Internal energy of n moles of the gas is,

U=\frac{3}{2} n R T \Rightarrow \Delta U=\frac{3}{2} n R(\Delta T)

substituting the values,

\Delta u=\frac{3}{2} \times 3 \times 8.31 \times 2.0=74.8 \mathrm{~J}

Hence, option b is correct.

 

Posted by

rishi.raj

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