Areal gas behaves more like an ideal gas when the gas molecules are
a. close and have strong attractive forces between them
b. close and have weak attractive forces between them
c. far apart and have strong attractive forces between them
d. far apart and have weak attractive forces between them

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).