# Solving Molarity Problems

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Determine the mass of miconazole used to form the aforementioned solution in milligrams.” C Step 1: Determine which formula(s) to use. Using the relationship between mass, moles and molecular weight, we can convert the number of moles to mass later (see previous article). The concentration is already expressed in M so we do not need to do any conversion here. Now that we are using the correct units, we may now use Formula 1 to determine the number of moles.

On the other hand, the volume of the solvent is expressed in ml so we will need to convert the volume from ml to l. Step 4: Convert moles to mass Recall from the previous article that the relationship between moles and mass is as follows: Using a periodic table and the provided chemical formula of miconazole, the molecular weight of miconazole is determined as 416.13 g/mol. 0.0208 g = 20.8 mg Answer to Problem 2: 20.8 mg of miconazole was dissolved in 50 ml of solvent to form a solution with a concentration of 0.001 M.

To get around this problem chemists commonly make up their solutions in volumetric flasks.

These are flasks that have a long neck with an etched line indicating the volume.

The solute is defined as the substance being dissolved, while the solvent is the substance where the solute is dissolved (usually water).

The solution is the combination of the solute and the solvent.

You will need a periodic table of elements for this.

“0.02 mol of D-Xylose was dissolved in 160 ml of water.

Solution #1 is the one for which you have only concentration - the solution that is already sitting on the shelf.

Solution #2 is the one for which you have both concentration and volume - the solution that you are going to prepare.