Question

Which of the following represents the mass of glucose and mass of water required to make 250g solution which contains 25% glucose.

• A. Mass of water = 187.5 g
• B. Mass of glucose = 75 g
• C. Mass of water = 375 g
• D. Mass of glucose = 62.5 g

Answer 1

Answer: (A), (D)

Mass of glucose = 62.5 g

Given mass of solution (M) = 250 g Concentration of solution = 25% Concentration (mass by mass percentage)= $\frac{\text{mass of solute (m)}}{\text{mass of solution (M)}}\times 100$

$\Rightarrow$ 25 = $\frac{m}{250}\times 100$
$\Rightarrow$ m = $\frac{25}{100}\times 250$ = 62.5 g
$\Rightarrow$ Mass of solute = 62.5 g Mass of solvent (water) = M - m = (250 - 62.5) g = 187.5 g