What mass of NaOH is needed to make 450 mL of a 2.0 molar solution?

Name: What mass of NaOH is needed to make 450 mL of a 2.0 molar solution?
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Question

Quizplus · Accepted Answer

Molarity = moles of solute / liters of solution
2.0 M = x moles / 0.45 L
x = 0.9 moles of NaOH
To find the mass of NaOH needed, we need to use its molar mass:
- Na: 1 x 23 = 23 g/mol
- O: 1 x 16 = 16 g/mol
- H: 1 x 1 = 1 g/mol
Molar mass NaOH = 23 + 16 + 1 = 40 g/mol
Mass = moles x molar mass = 0.9 mol x 40 g/mol = 36 g

What Mass of NaOH Is Needed to Make 450 ML