Which equation clearly defines the entropy change during the constant pressure process for a system with m kg of gas at pressure $$P_1$$ , volume $$V_1$$, . temperature $$T_1$$ and entropy $$s_1$$, when heated to state points of pressure $$P_2$$ , volume $$V_2$$, temperature $$T_2$$ and entropy $$s_2$$?

A

$$mc_vIn\frac{T_2}{T_1}$$

B

$$mc_pIn\frac{T_2}{T_1}$$

C

$$mRIn\frac{V_2}{V_1}$$

D

$$mc_v\left(\frac{n - \gamma}{n - 1} \right)In\frac{T_2}{T_1}$$