Question

In $500$ grams of water dissolved 2 moles of potassium sulphate the mass precentage of salt in soluton:

• A. $41\%$
• B. $60\%$
• C. $35\%$
• D. $48\%$

Answer 1

The correct option is A $41\%$

Given that ,

$2$ moles of potassium sulphate is dissolved in $500$ gm of water

we know that ,

Molar mass of potassium sulphate$=174g$

$\therefore$ Mass of potassium sulphate dissolved $=2\times 174=348g$

Mass percentage of salt$=\frac{\text{Mass of solute}}{\text{Mass of solution}}\times 100\text{\%}=\frac{348}{500+348}\times 100\text{\%}=\frac{348}{848}\times 100\text{\%}=41.03\text{\%}=41\text{\%}$