# Thread: I need help with more gas laws problems?

1. ## I need help with more gas laws problems?

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?

Carbon dioxide is produced during the combustion of liquid propane fuel. If 5.0kg of propane are burned at 1.000 atm and 400degrees C, what colume of CO2 gas is produced?

C3H8 + 5O2 ---> 3CO2 + 4H2O

If you collect 350.0 mL h2 gas over water at 90.0C and under 115.4kPa of pressure, what will the dry gas volume be at STP? (water vapor pressure at 90.0C is 70.1kPa)

2. 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?

First

perform PV=nRT, just rearrange to get moles, convert the mmHg into atm, and the degrees to Kelvin.

Second.

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

3. i dont get it i got 60.5 g HCl i dont know what i did wrong.