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The answer to your question is given below

Explanation:

To prepare 3 M solution of NaOH, do the following:

1. Determine the number of mole of NaOH in the solution. This can be obtained as follow:

Molarity of NaOH = 3 M

Volume = 1 L

Mole of NaOH =?

Mole = Molarity × Volume

Mole of NaOH = 3 × 1

Mole of NaOH = 3 moles

2. Determine the mass of 3 moles of NaOH. This can be obtained as follow:

Mole of NaOH = 3 moles

Molar mass of NaOH = 23 + 16 + 1

= 40 g/mol

Mass of NaOH =?

Mass = Mole × molar mass

Mass of NaOH = 3 × 40

Mass of NaOH = 120 g

3. Measure 120 g of NaOH and dissolve in 1 L of water in a volumetric flask to produce 3 M of the solution.

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