Posted by **claire** on Wednesday, February 20, 2013 at 6:00pm.

What is the pressure in millimeters of mercury of 0.0115mol of helium gas with a volume of 211ml at a temperature of 25 degrees celsius?

Ok so I've come up with many different answers but none are right. You convert the mL to L and the temperature to Kelvin by adding 273 right? and you're using PV=NRT? And is the answer in psi so that I need to convert it to mmHg? Sorry, so many question!

- chemistry -
**claire**, Wednesday, February 20, 2013 at 6:02pm
questions**

- chemistry -
**claire**, Wednesday, February 20, 2013 at 6:22pm
Just kidding. I'm stupid. I converted psi to mmHg and not atm to mmHg instead.

- chemistry -
**DrBob222**, Wednesday, February 20, 2013 at 7:24pm
I assume you know what went wrong but I'll play it safe and answer.

Yes, T must be in kelvin, P in atmospheres, V in L. n = grams/molar mass.

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