Question

Calculate the mass of glucose and the mass of water required to make 500 g glucose solution, given that the concentration of solution (m/m%) is 25%.

• A. Mass of glucose = 125 g; Mass of water = 350 g
• B. Mass of glucose = 125 g; Mass of water = 375 g
• C. Mass of glucose = 100 g; Mass of water = 350 g
• D. Mass of glucose = 100 g; Mass of water = 375 g

Answer 1

The correct option is B

Mass of glucose = 125 g; Mass of water = 375 g

Given-
Mass of glucose solution = 500 g
Concentration of solution (m/m%) = 25%

Let's say, that the mass of solute (glucose) = m g

Since, mass by mass percentage of solution = (Mass of solute/Mass of solution) $\times$ 100
$\Rightarrow$ 25 = $\frac{m}{500}\times 100$

$\Rightarrow$ m = $\frac{25}{100}\times 500$ = 125 g

$\Rightarrow$ Mass of solute (glucose) = 125 g

Therefore, mass of solvent (water) = Mass of solution - Mass of solute (glucose) = 500 g - 125 g = 375 g