Posted by **Andy** on Monday, May 10, 2010 at 10:20pm.

Dr Bob

Can you confirm please

Given a cylinder of fixed volume filled with one mole of Ar gas,which of the following is CORRECT?

(assume that all gases obey the ideal gas laws)

A: if the cylinder temp. is changed from 20 to 25 deg.C the pressure will double

B:a cylinder of identical volume filled with the same PRESSURE of He must contain more atoms of gas as He atoms are smaller than Ar atoms.

C:if a second mole of Ar is added to the cylinder, the ratio T/P would remain constant

D: two of the above

E: none of the above

I think its E none of the above..after scouring through the text book for way to many hours I have reached the conclusion that if all the gases obey the same ideal gas law ....then none can be right!!!

Am I correct please in my thoughts?

Thanks Andy

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