Molar specific heat at constant volume, for a non-linear triatomic gas is (vibration mode neglected)
A$3 R$
B$4 R$
C$2 R$
D$R$
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A$3 R$
a (a)
Molar heat capacities for a gas is given by $C_v=\frac{f}{2} R T$
Where $f=6$ in triatomic molecules
$C_v=3 R T$
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