Question

You are trying to determine the
mass of sodium chloride required to
create a 0.875 m solution in 534 g of water. How many moles of NaCl are required?
[?] mol NaCl

Answer 1

The number of mole of NaCl required to prepare the solution is 0.467 mole

What is molality?

The molality of a solution is simply defined as the mole of solute per kilogram of water. It is expressed mathematically as

Molality = mole / mass (Kg) of water

How to determine the mole of NaCl required

• Molality = 0.875 M
• Mass of water = 534 g = 534 / 1000 = 0.534 Kg
• Mole of NaCl =?

Molality = mole / mass (Kg) of water

0.875 = mole of NaCl / 0.534

Cross multiply

Mole of NaCl = 0.875 × 0.534

Mole of NaCl = 0.467 mole

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