Question

The molar mass of NaOH is 40.00 g/mol. If 5.20 g NaOH are dissolved in 0.500 L of solution, what is the molarity of the solution?
Use Molarity equals StartFraction moles of solute over liters of solution EndFraction..
0.0125 M
0.260 M
3.85 M
7.69 M

Answer 1

5.20 g / 40.00 g = 0.130 moles NaOH

molarity = moles of solute / liters of solution

M = 0.130 moles / 0.500 L

M = 0.260

b) 0.260 M

Answer 2

The molarity of the solution is 0.260M

What is molarity?

Molarity is the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution. It is denoted by M.

What is solution?

Solution is a homogeneous mixture composed of two or more substances.

Molarity = Moles of solute / litres of solution

5.20g / 40.00g/mol = 0.130 moles NaOH

M = 0.130 moles / 0.500L

M = 0.260M

Hence, option 2 is the answer.

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