Question

Find the amount of sodium nitrate dissolved in $200g$ of solvent if the mass by mass percent of solute in solution is $20$%.

• A. $20g$
• B. $50g$
• C. $30g$
• D. $40g$

Answer 1

The correct option is B $50g$

$20$ mass by mass percentage of solute in a solution $=\frac{\text{Mass of solute}}{\text{Mass of solution}}$ $\times 100$

Let, mass of solute $=$ $xg$.

$\frac{x}{x+200}=\frac{20}{100};5x=x+200$

$x=50g$