Question

The molecular mass of sulphuric acid is .

• A. 95.55 $g{\mathrm{mol}}^{-1}$
• B. 55.01 $g{\mathrm{mol}}^{-1}$
• C. 98.07 $g{\mathrm{mol}}^{-1}$
• D. 101.25 $g{\mathrm{mol}}^{-1}$

Answer 1

The correct option is C 98.07 $g{\mathrm{mol}}^{-1}$

The molecular mass of sulphuric acid $\left(H_2{\mathrm{SO}}_4\right)$is 98.075 $g{\mathrm{mol}}^{-1}$.
Molecular mass of sulphuric acid = Atomic mass of two hydrogen atoms + Atomic mass of one sulphur atom + Atomic mass of four oxygen atoms
$2\times 1.007u+1\times 32.065u+4\times 16u=98\mathrm{u\; (approx)}$