Question

2.5g of sugar is dissolved in 47.5g of water. calcuate its concentration as percent by mass

Answer 1

Amount of sugar=2.5g
Amount of water=47.5g
Total amount=47.5+2.5=50g
Percent by mass of sugar= 2.5÷50×100
=5℅
So the percent by mass of water =100-5=95℅
Percent of sugar=5℅and per. Of water=95℅

Answer 2

Given:

2.5g of sugar is dissolved in 47.5g of water.

To find:

We have to find its concentration.

Solution:

The concentration by mass percentage is given as-

Concentration=mass of solute/mass of solution×100.

The mass of the solute that is sugar is 2.5 grams.

The mass of solvent that is water is 47.5 grams.

Thus, the mass of the solution is 2.5+47.5=50 grams.

Thus, the concentration is as follows-

Concentration=2.5/50×100

Concentration=5%.

Its concentration is 5% by mass.