Question

to begin to solve this problem, one must first recall the equation for molarity. which of the following equations is used to describe molarity?
$m=\frac{g_{solute}}{l_{solution}}$
$m=\frac{mol_{solute}}{l_{solvent}}$
$m = \frac{mol_{solute}}{l_{solution}}$
$m=\frac{mol_{solute}}{l_{solution}}$

Explanation:

Step1: Recall molarity definition

Molarity ($M$) is defined as the number of moles of solute per liter of solution.

Step2: Analyze options

The correct formula for molarity is $M=\frac{\text{mol}_{\text{solute}}}{L_{\text{solution}}}$. The first option has grams of solute instead of moles of solute. The second option has liters of solvent instead of liters of solution. The third option has the wrong symbol ($m$ instead of $M$ for molarity).

Answer:

$M=\frac{\text{mol}_{\text{solute}}}{L_{\text{solution}}}$ (the fourth - option)