Question

A solution in prepared by adding 2g if substance a in 18g of water calculate the mass percent of solute ​

Answer 1

Answer:

Given -

Amount of Solute = 2 g

Amount of Solvent = 18 g

To Find -

Mass per cent ?

Solution -

Mass percent = (Mass of Solute/Mass of Solution) × 100

➸ (2 g/2 g + 18 g) × 100

➸ (2 g/20 g) × 100

➸ (1/10) × 100

➸ 10 %

So, the mass per cent of Solute = 10 %.

SOME FORMULAS -

Mole fraction of A = No. of moles of A/No. of moles of Solution.

Mole fraction of B = No. of moles of B/No. of moles of Solution.

Molarity = No. of moles of Solute/Volume of Solution in litres.

Molality = No. of moles of Solute/Mass of solvent in kg.

Explanation:

Answer 2

Answer 10%

refer the attachment.