Need help with chemistry homework?

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Skarmclops

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I have a couple of questions that deal with ideal gas theory along with math like the combined gas law. Here are the following questions I'd like to be solved:

"Which gas would behave most nearly like an ideal gas at STP?
CL2, NH3, CO2, or H2?"

"Using your knowledge of chemistry, which statement concerning Propanone and water at 50 degrees C is true?

1.Propanone has a lower vapor pressure and weaker intermolecular forces than water.

2.Propanone has a higher vapor pressure and weaker intermolecular forces than water.

3.Propanone has a higher vapor pressure and stronger intermolecular forces than water.

4.Propanone has a lower vapor pressure and stronger intermolecular forces than water."

"Under which conditions of temperature and pressure would Helium behave most like an ideal gas?

1.50 degrees K and 600kPa
2.50 degrees K and 20 kPa
3.750 degrees K and 20 kPa
4.750 degrees K and 600 kPa"

"The gas volume in the cylinder is 6.2 milliliters and its pressure is 1.4 atmospheres. The piston is then pushed in until the gas volume is 3.1 milliliters while the temperature remains constant.

Calculate the pressure, in atm, after the change in volume. Show all work."

PLEASE HELP ME. THANKS IN ADVANCE
 
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