Question

The internal energy of 10 g of nitrogen at NTP is about

2575 J

2025 J

3721 J

4051 J

Answer 1

internal energy = nCv∆T

Answer 2

Given that,

Mass of Nitrogen is 10 gram.

To find,

The internal energy of 10 g of Nitrogen

Solution,

Internal energy of any gas at NTP is given by :

$E=n\dfrac{f}{2}T$

n is number of moles of Nitrogen, $n=\dfrac{10}{28}=0.35\ moles$

f is degree of freedom, for nitrogen, f = 5

T is temperature at NTP, T = 273 K

Internal energy becomes,

$E=n\dfrac{f}{2}T\\\\E=0.3571\times \dfrac{5}{2}\times 8.31\times 273\\\\E=2025.31\ J$

Hence, the correct option is (b).

Learn more,

Internal energy of gas molecules

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