Question

A solution is prepared of dissolving 5 g of salt and 8 g of sugar in 77 g of water. Calculate the mass percentage of each component of the solution

Answer 1

Given

Mass of salt = 5 g, mass of sugar = 8 g, mass of water = 77 g

Total mass of the mixture is 5 + 8 + 77 = 90 g

Mass % of an item = mass of that item * 100 / total mass of the mixture

mass % of salt = 5 * 100 / 90 = 5.55%

mass % of sugar = 8 * 100 / 90 = 8.88 %

mass % of water = 77 * 100 / 90 = 85.55 %

Answer 2

5.55%, 8.89% and 85.56% are the mass percentages of salt, sugar and water respectively in the given solution.

Given,

Mass of salt=5 g.

Mass of sugar=8 g.

Mass of water(solvent) in which they are being dissolved=77 g.

To find,

the mass percentage of each component of the solution.

Solution:

• A solution is a homogeneous mixture of two or more components.
• The substance which is dissolved is known as solute and the one in which the solute gets dissolved is known as solvent.
• Mass percentage of a substance in a solution is defined as the mass of substance present in 100 g of a solution.

It can be calculated as:

Mass percentage of solute=(Mass of solute/Mass of solution) x 100

Mass percentage of solvent=(Mass of solvent/ Mass of solution) x 100.

Mass of solution=Mass of solute+Mass of solvent

The solution given here has three components, two of which are solutes and the other is a solvent.

Mass of solution=(5+8+77) g

Mass of solution=90 g.

Mass percentage of salt=$\frac{5}{90} X100$=5.55%.

Mass percentage of salt in the solution is 5.55%.

Mass percentage of sugar=$\frac{8}{90} X100$=8.89%.

Mass percentage of sugar in the solution is 8.89%.

Mass percentage of water(solvent)=$\frac{77}{90} X100$=85.56%

Mass percentage of water in the solution is 85.56%.

#SPJ2