NCERT Class XI Chemistry Some Basic Concepts of Chemistry Solutions

Question : 11

Total: 36

What is the concentration of sugar (C12H22O11) in molL–1 if its 20 g are dissolved in enough water to make a final volume up to 2 L?

Solution:

The molecular mass of sugar (C12H22O11) = 12 × 12 + 1 × 22 + 11 × 16
= 144 + 22 + 176 = 342
∴ Moles of sugar =

342

= 0.058
Volume of solution = 2 L
∴ Molarity =

Moles‌of‌solute

Volume‌of‌solution‌in‌litre

0.058

= 0.029 molL−1

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