$C{O_2}(O - C - O)$ is a triatomic gas. Mean kinetic energy of one gram gas will be (If $N-$Avogadro's number, $k-$Boltzmann's constant and molecular weight of $C{O_2} = 44$)
A$(3/88)NkT$
B$(5/88)NkT$
C$6/88NkT$
D$(7/88)NkT$
Medium
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D$(7/88)NkT$
d Mean kinetic energy for $n$ mole gas $=\mu \cdot \frac{f}{2} R T$
$\therefore E=\mu \frac{7}{2} R T=\left(\frac{m}{M}\right) \frac{7}{2} N k T$
$=\frac{1}{44}\left(\frac{7}{2}\right) N k T=\frac{7}{88} N k T$
[As $f=7$ and $M=44$ for $CO _{2}$ ]
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