P(mw)=drt

[kjpage]

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Will this formula work for determining Molecular weight or density of a gas? I have seen places where this formula was used, but achiever uses MW=D(RT/P), where RT is the only part divided by P.

 

[jj2chemastray6]

the two formulas you put up are the same.... essentially...

order of operations has multiplication and division at the same step

since everything in the equations is multiplication and division, the parentheses don't matter

 

[kjpage]

ha yeah you're right...can't believe I didn't recognize that? thanks for the lesson in pre-algebra!

 

[GCT]

Will this formula work for determining Molecular weight or density of a gas? I have seen places where this formula was used, but achiever uses MW=D(RT/P), where RT is the only part divided by P.

Yeah it's going to work , density is grams / volume molecular weight is grams / mole it all cancels out to give PV=nRT .

 

[Moka11]

P(MW)=DRT

For this equation why isn't P inversely related to MW?

For example (Destroyer 13' Q131): If I have a vessel with Ar and I replace the gas with He, and both vessels contained 10 moles. then why is the only thing that changes the density? Shouldn't the pressure decrease? Why would this be different than PV=nRT?