if you know the molarity (m) of a solution, what additional information do you need to calculate its mass…

if you know the molarity (m) of a solution, what additional information do you need to calculate its mass concentration in g/l?\nthe density of the solution\nthe molar mass of the solute\nthe volume of the solution\nthe temperature of the solution

if you know the molarity (m) of a solution, what additional information do you need to calculate its mass concentration in g/l?\nthe density of the solution\nthe molar mass of the solute\nthe volume of the solution\nthe temperature of the solution

Answer

Explanation:

Step1: Recall molarity and mass - concentration formulas

Molarity ($M$) is defined as $M=\frac{n}{V}$, where $n$ is the number of moles of solute and $V$ is the volume of the solution in liters. Mass - concentration ($\rho$) is defined as $\rho=\frac{m}{V}$, where $m$ is the mass of the solute in grams and $V$ is the volume of the solution in liters. Also, $n = \frac{m}{M_{solute}}$, where $M_{solute}$ is the molar mass of the solute.

Step2: Relate molarity and mass - concentration

We know $M=\frac{n}{V}$ and $\rho=\frac{m}{V}$. Since $n=\frac{m}{M_{solute}}$, we can rewrite $M$ as $M = \frac{m}{M_{solute}\times V}$. Then, $\rho=\frac{m}{V}=M\times M_{solute}$. Given molarity $M$, to find $\rho$ (mass - concentration in g/L), we need the molar mass of the solute.

Answer:

The molar mass of the solute