Question

The molar concentration of 250ml solution that contain5g Na2CO3 is?​

Answer 1

Molarity = 0.2 M

Step-by-step explanation:

Given data:

Molar concentration = ?

Volume of solution = 250 mL (250 mL/1000 = 0.25 L)

Mass of Na₂CO₃ = 5 g

Solution:

Number of moles of Na₂CO₃:

Number of moles = mass/molar mass

Number of moles = 5 g / 106 g/mol

Number of moles = 0.05 mol

Molarity = number of moles / volume of solution in L

Molarity = 0.05 mol / 0.25 L

Molarity = 0.2 M (M = mol/L)