[mg21500]

I am new to this site  and I would really appreciate the help with this problem. Thanks!

A mixture of Ne and Cl2  in a flask at 33.0°C exerts a pressure of 1957 torr.  All of the of Cl2 is removed and the pressure is now 1203 torr (°T remains constant).The Cl2 removed occupies a 10.0 L container at 0.500 atm at 25°C.  How many g of Ne are present in the original container?

[Arkcon]

OK, to begin to figure this out for yourself -- you've been given pressure, and temperature of mixtures of gasses, then volumes and pressure and temperature of just one of them.  But you're asked in the end for grams.  Are you aware of a formula that's used to relate all those things together?

[mg21500]

I've used the Ideal gas formula PV=nRT, to find the moles of the Cl2.
The thing that is confusing me is whether i should use the pressure of 1203 torr in my formula to get the answer?

[Borek]

Yes, you need to use this pressure at some point of calculations. But as we don't know what you are doing at the moment it is impossible to answer your question.