Hydrocarbon molecular weight grade 11

[lunapt]

Homework Statement

A gaseous hydrocarbon weighing 0.185g occupies a volume of 110.cm^3 at 26 celsius and 743mmHg. what is the molecular weight of this compound?

Homework Equations

PV=nRT

The Attempt at a Solution

i have no idea where to start ;(

 

[Bohrok]

The molecular weight is in g/mol; you have the mass of the sample, so now you need to find the moles so you can divide them. Rewriting the equation to get n, or the moles, by itself gives you n = ^PV/_RT. Convert everything to the correct units, then plug them into the equation.

 

[lunapt]

ohh, i see it now.. many thanks =]