The percent composition by mass of a 100g salt solution which contains 20g salt is [tex]\bold{16.6\%}[/tex]
Solution:
Percent composition is calculated as, weight of the solute divided by amount of solute added to 100 g is solution multiplied by 100.
[tex]\Rightarrow \frac{\text {weight of solute}(g)}{\text {weight of solute}(g)+\text {weight of solution(g)}} \times 100[/tex]
Given, 100 g of salt solution with 20 g of salt
Weight of the solute and solvent is [tex]20 + 100 g = 120 g[/tex]
[tex]percent composition=\frac{20}{120} \times 100=\frac{200}{12}=16.6[/tex]
[tex]\therefore \text { percent composition } =16.6 \%[/tex]
The percent composition by mass of 20 grams of salt in a 100 gram salt solution is equal to 16.67%.
Given the following data:
To determine the percent composition by mass of salt in the salt solution:
First of all, we would determine the total weight of the solution.
[tex]Total\;weight = mass\;of\;salt + mass\;of \;salt \;solution\\\\Total\;weight = 20 + 100\\\\Total\;weight = 120 \;grams[/tex]
Mathematically, percent composition is given by the formula:
[tex]Percent\;composition = \frac{Mass\;of\;solute}{Total\;weight} \times 100[/tex]
Substituting the given parameters into the formula, we have;
[tex]Percent\;composition = \frac{20}{120} \times 100\\\\Percent\;composition = \frac{2000}{120}[/tex]
Percent composition = 16.67%
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