An open flask sitting in a lab fridge looks empty, but it is filled with a mixture of gases called air. If the flask volume is 2.50 L, and the air is at standard temperature and pressure, how many gaseous molecules does the flask contain?

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Answer 1 · 2016-11-02T05:02:55

If we assume that the temperature inside the fridge is #5# #""^@C#, there are #0.219*molxx6.022xx10^23*mol^-1# of dinitrogen and dioxygen molecules.

From the Ideal Gas Law: #n=(PV)/(RT)# #=# #(1*atmxx5*L)/(0.0821*L*atm*K^-1*mol^-1xx278*K)# #=# #0.219*mol#

And thus we mulitply #0.219*mol# by #"Avogadro's number"#.

#0.219*molxx6.022xx10^23*mol^-1=??#

If the flask were at room temperature, would it contain the same number of molecules?