Question

What is the percentage by mass of solution formed by dissolving 27.0 grams of HCl in 102.0 grams of water?

Answer 1

Total mass = 27.0+102.0 = 129.0 g

Proportion:

129.0 – 100%

27.0 – x

$x = \frac{27.0 \times 100 \; \%}{129.0} = 20.93 \; \%$

Answer: 20.93 %