Calculate the concentration of NaOH in terms of molarity.....?

Question

If a solution contains 5 g NaOH per litre, calculate the concentration of NaOH in term of molarity. Atomic weight: Na=23; O=16; H=1;

5

5000

0.125

0.09

thanks for anyone that can help!

Answer 1

Molarity = moles of solute / liters of solution

moles of solute = mass of solute / molar mass of solute

Molarity = (mass of solute / molar mass of solute) / liters of solution

Given:

mass of solute NaOH = 5g

1 liter of solution

Molarity = (5g / 40g/mol) / 1 L

Molarity = 0.125 moles/L = 0.125 M

Answer: 0.125 M

Answer 2

Moles NaOH = mass / molar mass = 5 g / 40 g/mol =0.125

Molarity = moles / Volume ( in L) = 0.125 mol / 1 L = 0.125 M