Answer
Please see the work below.
Work Step by Step
We know that
$PV=nRT$
This can be rearranged as:
$n=\frac{PV}{RT}$
We plug in the known values to obtain:
$n=\frac{(14\times 10^6)(0.00688)}{(8.314)(20+273)}$
$n=40 moles $
Thus, you did not get what you paid for.
