Question

a solution is prepared by adding two gram of a substance A to 18 gram of water calculate the mass percent of solute

Answer 1

Mass % of solute = Mass of solute/ Mass of solution× 100
=2 /( 18 +2)× 100
= 2/20× 100
= 1/10× 100
= 10%

Answer 2

we need to get the total mass of the solution.

The total mass of the solution is given by :

Total mass = Mass of the solute + Mass of the solvent

= 18 + 2 = 20

The mass of the solute = 2

The mass percent of the solute will therefore be given by :

2/20 × 100%

We compute this as follows:

1/10 × 100%

This gives us the following percentage as our answer.

= 10%

The mass percent of the solute is thus 10%