- #1
Philip Wong
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Homework Statement
A sealed cubical container 20.0 cm on a side contains three times Avogadro’s number of molecules at a temperature of 20.0°C. Find the force exerted by the gas on one of the walls of the container.
Homework Equations
[itex]PV=nRT[/itex]
[itex]P=F/A[/itex]
The Attempt at a Solution
Hello people, here is what I understands from the question
[itex]V=(0.2)^3[/itex]
[itex]PV=3*n*R*(20+273K)[/itex]
[itex]P*(0.2)^3=3*n*8.31*(293)[/itex]
[itex]P=(7304.49n)/(0.2)^3[/itex]
[itex]P=913061.25n[/itex]
This is where I don't understands, according to the answer shown by the lecturer, he uses n=3 instead of 3n (which is what I've suggested). Can someone show me why is this?
thanks,
Phil