now this is something I love doing.. (chem major here)
hydrogen gas and chlorine gas react to produce gaseous hydrogen chloride. if the volume of the HCl produced is 28.3L at 630. mmHg and 200 degrees , how many grams of HCl were produced?
perform PV=nRT, just rearrange to get moles, convert the mmHg into atm, and the degrees to Kelvin.
Find the reaction formula for Cl(g) and H(g)
Try not to look at this before figuring it out.. you need to know this(not sure if you do or not)
H2(g) + Cl2(g) --> 2HCl(g)
We have 2 moles of H and Cl, therefore we have to balance the equation by putting a coefficient of 2 in front of the Product HCl(g)
Now you have the moles produced and the mol to mol ratio.. from there it should be easy.. if not let me know, but I don't want to give you everything, part of learning chemistry is doing it yourself