Question

A sample of $H_2{O}_2$ solution labelled as “28 volume” has density of 265 g/L. Mark the correct option(s) representing concentration of same solution in other units:

• A. $M_{H_2{O}_2}=2.5$
• B. $\%\frac{w}{V}=17$
• C. Mole fraction of $H_2{O}_2=0.2$
• D. $m_{H_2{O}_2}=13.88$

Answer 1

Answer: (A), (C), (D)

The correct options are
A $M_{H_2{O}_2}=2.5$
C Mole fraction of $H_2{O}_2=0.2$
D $m_{H_2{O}_2}=13.88$

$\therefore M=\frac{28}{11.2}=2.5$

$\therefore$ 1 L contain 2.5 moles of $H_2{O}_2$

or $2.5\times 34=85g{H}_2{O}_2$

Mass of 1 litre solution = 265g $(\therefore d=265g/L)$

$\therefore W_{H_{2}O}=180g$ or moles of $H_{2}O=10$

$x_{H_2{O}_2}=\frac{2.5}{2.5+10}=0.2$

$\%\frac{w}{v}=\frac{2.5\times 34}{1000}\times 100=8.5$

$m=\frac{2.5}{180}\times 1000=13.88$