For clouds to form water vapor in the air must condense and change from gas to a liquid

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure

In what environment would mineral formation caused by high pressures and high temperatures most likely occur?

4.25g sample of solid ammonium nitrate dissolves in 60.0g of water in a coffee-cup calorimeter, the temperature drops from 22.0 c to 16.9 c. assume that the specific heat of the solution is the same as that of pure water. calculate delta(h) (in kj/mol nh4no3) for the solution proces.