L. What will be molarity of 100 mL of pure water? (1) 0.55 M (2) 5.5 M (3) 1.8 M (4)

August 2023 2 6 Report

The molarity of 1 L of pure water is 55.55 mol/L. What will be molarity of 100 mL of pure water? (1) 0.55 M (2) 5.5 M (3) 1.8 M (4) 55.55 M

Answer:

Molarity =

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No of moles of solute

Volume of solution in litre Step 1: To find the mass of water in one liter.

We know that,

Density of water = 1g/ml

or = 1kg/L

Therefore, the mass of 1L of water will

be: Mass = Density of water × Volume

kg Mass = 1 × 1L

Mass = 1kg = 1000g

Step 2: To find the molar mass of water

Molar mass of H2O = 2 x H + 1×0

Molar mass of H2O = 2 × 1+1 × 16

Molar mass of H20=2+16= 18 g/