Chemistry Calculations

Question

3. The blood serum acetone level for a person is determined to be 1.8 mg of acetone per 100 mL of

serum. Express this concentration as % (v/v) is liquid acetone has a density of 0.79 g/mL.

4. Calculate the following:

a. The number of grams of NaOH in 20.0 mL of a 1.20% (w/v) NaOH solution.

b. The number of milliliters of alcohol in 500 mL of a 20.0% (v/v) solution.

Answer 1

For question #3:

First, you would convert mg of acetone to grams of acetone. Since the question is asking you to find %v/v (volume percent), you will need to find the volume of acetone. You can do this by using the density equation (d=m/v). For the final calculation, you need to find the percent volume of acetone per volume of serum.

[(volume acetone)/(volume serum)] * 100