Question

How many grams of glucose are needed to prepare 400. ml of a 2.0%(m/v) glucose solution?

Answer 1

8 grams

A 2.0%m/v (mass/volume) solution is 2 grams of solute in 100 mL of final solution.

So for 400 mL of solution, you require

400mL⋅2 g100mL=8 g

Answer 2

Answer:8 grams of glucose are needed to prepare 400. ml of a 2.0%(m/v) glucose solution.

Explanation:

Volume of the solution = 400 mL

Mass by volume percentage of the solution = 2%

Mass of the glucose = m

The mass by volume percent is given by formula ;

$(m/v\%)=\frac{\text{mass of the solute}}{\text{Volume of the solution}}\times 100$

$2\%=\frac{m}{400}\times 100$

m = 8 g

8 grams of glucose are needed to prepare 400. ml of a 2.0%(m/v) glucose solution.