Compare the movement of molecules in a state of matter to the movement of molecules during a phase change?

The length of a vector arrow represents its magnitude and the point represents its direction true or false apex

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.

Butane gas reacts with oxygen gas to give carbon dioxide gas and water vapor (gas). if you mix butane and oxygen in the correct stoichiometric ratio, and if the total pressure of the mixture is 390 mmhg, what is the pressure (in mmhg) of water vapor after the reaction is completed (temperature and volume do not change).