Question

How many grams of a drug must be used to prepare 4 liters of a 1 percent solution?

A. 4000 g
B. 400 g
C. 4 g
D. 40 g

Answer 1

40g.

Explanation:

Assuming that the solvent for thje drug is water, 4 liters of water equal 4000ml of water, and that has a mass of 4000 grams. Therefore, in order to get a 4% drug you need to add 40 grams of the drug (4000*0.01) and the rest is going to be water (3960 ml). The final product is going to consist on 40g of the drug + 3960ml of water.