Question

A solution of \(H_2SO_4\) is 31.4% \(H_2SO_4\) by mass and has a density of 1.25g/mL. The molarity of the \(H_2SO_4\) solution is ____ M (nearest integer)

[Given molar mass of \(H_2SO_4 =98g\,mol^{-1}\)]

Answer 1

Correct answer is : 4

\(M =\frac {n_{solute}}{V}\times 1000\)

\(=\cfrac {\left(\frac{31.4}{98}\right)}{\left(\frac{100}{1.25}\right)} \times 1000\)

\(=4.005 \approx4\)