Question

How many mL of 2.50% glucose solution are needed to obtain 0.500g glucose

Answer 1

To determine the volume of the solution given the amount of solute, we need the concentration of the solute. As we can see the given percent are in units of mass per volume. We calculate as follows:
.0250 = .500 / Volume of solutionVolume of solution = 20 mL

Hope this answers the question.