What's the rms speed of the molecules?

[cdymdcool]

1. A canister containing 150kg of an ideal gas has a volume of 8 m^3. If the gas exerts a pressure of 5*10^5 Pa, what's the rms speed of the modecules?



I can't get the temperature of the canister...

 

[ideasrule]

You don't need it. You have PV=nRT, so T=PV/nR. Leave it as that and continue solving the problem. Eventually, you should get a "nm" in your solution. What's this equal to?

 

[cdymdcool]

so nm equals the #of moles times its mass, what isn't the #of moles still unknow?

 

[ideasrule]

nm is the #of moles times the molar mass (mass per mole). What's # of moles times the mass per mole?

 

[cdymdcool]

nm is the #of moles times the molar mass (mass per mole). What's # of moles times the mass per mole?

I use the formula v = square root of(3kT/m), which k stands for boltzmann's constant and m stants for the mass of molecule.