7. Equal numbers of moles of CO2(g), N2(g), and NH3(g) are placed in a sealed vessel at room temperature. If the vessel has a pinhole-size leak, which of the following will be true after some of the gas mixture has effused? I. The mole fraction of CO2 in the sample will increase.
II. The N, will effuse the fastest since it is the lightest.
III. All gases will effuse at the same rate since the temperature is held constant.

I only
III only
I and II
II and III
I, II, and III​