Question

Question: 2 Based on the mass of lactose of 0.28 grams in 1 mL of skim milk, calculate the percent composition of lactose in skim milk.​

Answer 1

Considering the definition of mass volume percent, the percent composition of lactose in skim milk is 28%.

Mass volume percent

The concentration of solutions is the amount of solute contained in a given amount of solvent or solution. In other words, the relationship between the amount of solute and the amount of solvent is called concentration.

Mass volume percent (% m/V) is a measure of concentration that indicates the number of grams of solute in each 100 mL of solution.

In other words, mass-volume percent is an intensive property that is defined as the mass of solute (in grams) that there are in 100 mL of solution and it is calculated by applying the following equation:

$Mass volume percent=\frac{mass solute (grams)}{volume solution (mL)}x100$

This is, mass volume percent is defined as the ratio of the mass of solute that is present in a solution, relative to the volume of the solution, as a whole.

Percent composition of lactose in skim milk

In this case, you know:

• mass solute= 0.28 grams
• volume solution= 1 mL

Replacing in the definition of mass volume percent:

$Mass volume percent=\frac{0.28 grams}{1 mL}x100$

Solving:

mass volume percent= 28 %

Finally, the percent composition of lactose in skim milk is 28%.

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