The volume of a sample of hydrogen gas was decreased from 11.89 L to 5.18 L at constant temperature. If the final pressure exerted by the hydrogen gas sample was 8.46 atm, what pressure did the hydrogen gas exert before its volume was decreased?
From 11.89 to 5.18 litres it is a decrease of 6.71 litres. The 5.18 liters of hydrogen gas has a pressure of 8.46 atm. 11.89/5.18=2.295 so 8.46x2,295=19.42 atm. This is assuming that the pressure of a gas is directly proportional to its volume.
