I reported a volume of #8.32*mL# for a mass of #6.54*g# with respect to acetone, where #rho_"acetone"=0.7857*g*mL^-1#. Is this correct?
We simply use the given equation to solve for mass or volume. We know or should know that
So my answer is consistent with yours (of course, we might have both made the same error, however, my answer is consistent dimensionally so this is unlikely).
For a mass of
So, I think you are batting on a firm wicket.