Avogadro s number is part of the conversion factor needed to solve a moles of A to grams of A problem. The sum of the coefficients in the balanced equation for the production of water from hydrogen gas and oxygen gas is 5. The vapor pressure of a liquid increases as temperature increases. Liquids are very compressible because there is a lot of empty space between particles. The compound H 2 O has a greater formula mass than does the compound NH 3 .
Gases expand when they are cooled.
Choose the one, BEST answer 11. A mole of butane contains four moles of carbon atoms and ten moles of hydrogen atoms. A sample of Helium has a volume of 480 mL at 47.0 C and 740 mm Hg. The temp is lowered to 22.0 C and the pressure to 625 mm Hg. London forces 22.