Question

What is the molarity of a 2.0 L sodium hydroxide solution containing 10.0 grams of solute?

A.0.80
B.0.13
C.5.0
D.0.25

Answer 1

Molar mass NaOH ( sodium hydroxide) = 40.0 g/mol

Number of moles:

n = mass / molar mass

n = 10.0 / 40.0

n = 0.25 moles

Volume = 2.0 L

Molarity = number of moles / volume in liters

M = 0.25 / 2.0

M = 0.125 M

answer D

hope this helps!