A research worker has only 300 g of a valuable solvent and wishes to use all of it to make up a 10.0 mass percent solution of solute A. How many grams of A should be weighed out?

Question

Quizplus · Accepted Answer

To calculate the mass of solute A, we can use the formula:

mass of solute = mass of solution x concentration

We are given the mass of solution (the solvent) as 300 g and the concentration as 10.0%. We need to convert the concentration to a decimal by dividing by 100:

10.0% / 100 = 0.100

Now we can plug in the values and solve for the mass of solute:

mass of solute = 300 g x 0.100

mass of solute = 30 g

Therefore, we need to weigh out 30 grams of solute A to make a 10.0% solution in 300 grams of solvent. However, since none of the answer choices match this calculation exactly, we need to pick the closest one. Answer choice C, which is 33.3 g, is the closest, so we choose that as our answer.

A Research Worker Has Only 300 G of a Valuable