Question

What is the mass % of a solution if it contains 10 g of salt mixed with 100 g of water? *
A.9%
B. 10%
C. 110%

Answer 1

We need to find the Mass% of the solution , that contains 10g of salt mixed with 100g of water. Mass % can be calculated by dividing the mass of solute divided by total mass of solution ( solute + solvent) times 100 .

• Here salt is solute and is 10g , whereas water is solvent and has weight of 100g. So the total mass of the Solution will be 100g + 10g = 110g . Now let's Calculate the mass percentage .

$\sf\dashrightarrow Mass\% =\dfrac{Mass_{(Solute)}}{Mass_{(Solution)}}\times 100 \\\\\sf\dashrightarrow Mass\% = \dfrac{ 10g}{100g + 10g}\times 100 \\\\\sf\dashrightarrow Mass\% = \dfrac{ 10g}{110g}\times 100 \\\\\sf\dashrightarrow Mass\% = \dfrac{ 100}{11}\% \\\\\sf\dashrightarrow \boxed{\pink{\sf Mass\% = 9.09 \approx 9\% }}$