Question

Calculate the volume of $320\mathrm{g}$of ${\mathrm{SO}}_2$ at stp.

(Atomic mass : $S=32$and $O=16$ ).

Answer 1

• The molar mass is expressed as g/mol (grams per mole). The molar mass is defined as the ratio of mass of a substance to the number of moles present in it.
  Step1 : Molecular weight of ${\mathrm{SO}}_2$
  $\text{M.W.}=32+16\times 2=64$
  $64g$ of${SO}_2$ occupy $22.4\mathrm{litres}$
  1 g of ${\mathrm{SO}}_2$ will occupy $\frac{22.4}{64}\text{litres}$
  Then, $320g$of ${\mathrm{SO}}_2$ will occupy $$\begin{gathered} \frac{22.4}{64}\times 320 \\ 112\mathrm{ltr} \end{gathered}$$
  The volume of $320\mathrm{g}$of ${\mathrm{SO}}_2$ at S.T.P. will be $112\mathrm{ltr}$.