Question

$9.8g$ of $H_2{SO}_4$ is dissolved in $250g$ of aqueous solution, Calculate its percentage by mass, mole & density.

Answer 1

$9.8g$ of $H_2{SO}_4$ dissolved in $250g$ of aqueous solution.

Molecular weight $98g$.

Mole $=\frac{9.8}{98}=0.1$ mol of $H_2{SO}_4$

Mass percentage of solution $=(\frac{32}{98}\times 100)=32.65$%

oxygen $=(\frac{63.996}{98}\times 100)=65.3$

Hydrogen $=(\frac{2.016}{98}\times 100)=2.05$%

Molarity $=\frac{molesofsolutes}{volumeofsolutioninlitres}=\frac{0.1mol}{0.025litres}=250ml=25{cm}^3=4$