# chemistry

posted by
**claire**
.

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!