Question

Determine the percent composition by mass of a 100g salt solution which contains 20g salt

Answer 1

Answer:

Mass of solution=100g

mass of salt=20g

so; mass of solute=80g

percentage composition =(mass of salt/total

mass) ×100

=  \frac{20}{100}  \times 100 \\  = 20\%

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Answer 2

The percent composition by mass of a 100g salt solution which contains 20g salt is $\bold{16.6\%}$

Solution:  

Percent composition is calculated as, weight of the solute divided by amount of solute added to 100 g is solution multiplied by 100.

$\Rightarrow \frac{\text {weight of solute}(g)}{\text {weight of solute}(g)+\text {weight of solution(g)}} \times 100$

Given, 100 g of salt solution with 20 g of salt  

Weight of the solute and solvent is $20 + 100 g = 120 g$  

$percent composition=\frac{20}{120} \times 100=\frac{200}{12}=16.6$

$\therefore \text { percent composition } =16.6 \%$