What is the mass percentage of NaCl in the solution if 1.75g of NaCl is dissolved in 5.85g of water.
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 23.02
The mass percentage of a component is its mass divided by the total mass of the solution (solute + solvent), multiplied by 100:
\( \displaystyle \text{Mass \% of NaCl} = \frac{\text{mass of NaCl}}{\text{mass of NaCl} + \text{mass of water}} \times 100 \)
\( \displaystyle = \frac{1.75\ \mathrm{g}}{1.75\ \mathrm{g} + 5.85\ \mathrm{g}} \times 100 \)
\( \displaystyle = \frac{1.75}{7.60} \times 100 \approx 23.03 \)
So the mass percentage of NaCl is about 23.0, the value given in Option (1) as 23.02.