A platform balance showed the mass of a molded glass figurine to be 247.6 g. When immersed in water, the figurine displaced 83.9 ml. What is the density of the glass?

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).