A sample of argon gas occupies a volume of 400.0ml at a temperature of 90.0 Celsius and a pressure of 735 torr how many moles of argon are present?

1 Answer
Feb 19, 2018

#n_"Ar"=0.0130*mol#...

Explanation:

We address the old Ideal Gas Equation....

#n=(PV)/(RT)#

...and we note that one atmosphere will support of mercury that is #760*mm# high...and thus we can use a unit of length to represent a unit of pressure....

#n=((735*"Torr")/(760*"Torr"*atm^-1)xx400xx10^-3*L)/(0.0821*(L*atm)/(K*mol)xx363.15*K)#

#=0.0130*mol#