Jan 2012
Percents and gases

A gas cylinder contains a mixture of helium, nitrogen and oxygen. The pressure of the helium is 825 torr; the pressure of the nitrogen is 785 torr; and the pressure of the oxygen is 575 torr. What are the % (to the tenths place) of each gas in this tank?

I know normally you take the number you have and divide it by 100 but what do you do if the numbers you have are over 100? I just want to know how to do this? Like how do I set this up?
Last edited:
May 2010
volume %

add the partial pressures to give total pressure.Compute the volume % of each gas.
Since you only know volume % ,you cannot go further without more data