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1. A solution is formed by adding 36 g of sodium chloride to 250ml of water. What is the percent by mass of sodium chloride?





2. A solution is made by adding 25 mL of sugar to 75 mL of water. What is the percent by volume of sugar?
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Sagot :

Epay0507id

Explanation:

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Carlenesagaoinitid

Answer:

1. Mass percentage of NaCl= ((mass of NaCl added)/(mass of solution))*100

Mass of NaCl added=15g

Mass of solution = mass of NaCl added+maas of water taken=215g

Mass percentage =(15/215)*100

=6.97%

2. We can express the concentrations as mass percent and the units of such concentration is mass(Kg or g) of solute per unit mass(Kg or g) of mixture.

Here mixture is made up of water and sugar.

Given mass of water and sugar is 80 and 25 g respectively.

So the total mass of the mixture is 80 + 25 is equals to 105 grams.

Mass % of sugar(solute) is ( 25/105)*100

=23.81%

Mass % of water (solvent) is (80/105)*100

=76.19%

Explanation:

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