Question

How an increase in the total pressure of the system (PT) would affect the molar volume of CO2

Answer 1

According to the ideal gas equation, $(PV=nRT)$ , an increase in pressure $(P)$ results into a decrease in volume$(V)$ occupied by $CO_2$

In this case, the total number of $CO_2$ molecules within the volume$(n, molar mass)$ remains constant.