Question

FIND THE MOLARITY OF 2.69 G OFNa2So4 disolved in 16.7ml of the solution

Answer 1

Answer:

1.137 M

Step-by-step explanation:

Find molar mass of Na₂SO₄:

Molar mass = 2(23) + 32 + 4(16)

→ Molar mass = 46 + 32 + 64

→ Molar mass = 142 g/mol

Find the number of moles of solute:

Number of moles = Given Mass ÷ Molar mass

⇒ Number of moles = 2.69 ÷ 142

⇒ Number of moles = 0.019

Find the Molarity of the solution:

Molarity = Number of moles of solute ÷ Volume of solution

⇒ Molarity = (0.019 ÷ 16.7) × 1000

Here we multiplied by 1000 because the volume of solution should always be in litres

⇒ Molarity = 19 ÷ 16.7

⇒ Molarity = 1.137 M

∴ The Molarity of the solution = 1.137 M