What is the ratio of specific heats at constant pressure and constant volume for $NH_3$?

One mole of an ideal monatomic gas requires $210 \, J$ of heat to raise the temperature by $10 \, K$ when heated at constant pressure. If the same gas is heated at constant volume to raise the temperature by $10 \, K$,then the heat required is ....... $J$.

The molar specific heat at constant pressure of an ideal gas is $(7/2)R$. The ratio of specific heat at constant pressure to that at constant volume is

Molar specific heat at constant volume,for a non-linear triatomic gas is (vibration mode neglected).

Statement $A: C_P - C_V = R$
Statement $B: \frac{C_P}{C_V} = 1.67$

If the degree of freedom of a gas is $f,$ then the ratio of two specific heats ${C_P}/{C_V}$ is given by