Question

what is the molarity of 2.0 mol nacl in 4.0 l solution?
a 0.5 m
b 2.0 m
c 0.25 m
d 4.0 m

Explanation:

Step1: Recall the formula for molarity

Molarity ($M$) is calculated as $M=\frac{n}{V}$, where $n$ is the number of moles of solute and $V$ is the volume of the solution in liters.

Step2: Substitute the given values into the formula

Given $n = 2.0\space mol$ (moles of $NaCl$) and $V=4.0\space L$ (volume of the solution). Then $M=\frac{2.0\space mol}{4.0\space L}$.

Step3: Calculate the molarity

$\frac{2.0}{4.0}= 0.5$.

Answer:

A. $0.5\space M$