Question

$100$gm of an aq. solution of sugar contains $40\%$ sugar by mass. How much water should be evaporated get $50\%$ sugar solution by mass?

• A. $10g$
• B. $20g$
• C. $0.0g$
• D. $40g$

Answer 1

The correct option is A $10g$

$\underset{–}{\text{Initial condition}}:-$ $40\%$ sugar (by mass),

Therefore, In $100gm$ of an aqueous solution, $40g$ sugar and $60g$ water is present.

$\underset{–}{\text{Final condition}}:-$ $50\%$ sugar (by mass),

Therefore, In $100gm$ of an aqueous solution, $50g$ sugar and $50g$ water is present.

Amount of water to be evaporated $=60-50=10grams$