Finding Pv in Pv=nRT for molecular hydrogen
You can solve for either $P$ or $V$.  Choose one, say $P$, and then divide that into the right hand side $nRT$ to get $V$; i.e. $V=\frac{nRT}{P}$.

More seriously, you need to check your units!  You seem to be using Kelvins for $T$, which is right, and $n$ is just a count in moles.  But I do not recognize your value of $R$.  The SI value for $R$ is $8.3144621(75)$, in units of joules per Kelvin-mole.  Joules, in turn, are Pascal-meters$^3$. Personally, I think most people find Pascals too small a unit for pressure.  Far more practical would be Torr-liters, and then $R=62.36367(11)$.  You can examine lots of different unit combinations for $R$ at the ideal gas constant page on Wiki: Ideal Gas Constant