Gas Question

[blinktonheim]

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if 4 g of a gas occupies 11.2 L at 0 degrees C and .25 atm, the molecular mass of the gas is:


thanks for your help!

 

[CANgnome]

32 right?

4g / [(11.2)(.25)(1/0.0821)(1/273)]

 

[rjm546]

if 4 g of a gas occupies 11.2 L at 0 degrees C and .25 atm, the molecular mass of the gas is:


thanks for your help!

You would use pv=nrt, solve for n which gives you moles. Grams is already given to you and you are trying to find molar mass which is grams/moles.

Hope this helps

 

[blinktonheim]

oh haha.. duh... my brain is ready for bed, thanks for your help

 

[Troyvdg]

You would use pv=nrt, solve for n which gives you moles. Grams is already given to you and you are trying to find molar mass which is grams/moles.

Hope this helps

you can also solve this using the combined gas law. I think for the DAT we have to know both ways