SELECT * FROM question_mgmt as q WHERE id=1233 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=42 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

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

Answer:

Mass of sugar= 20g

 

Molecular mass of sugar=12x12 +1x22 +16x11=342 g

 

Mass of water= 2 liter

 

Molarity (M) = number of moles of solute/volume of solution in liters

 

= 20/(342x2) =0.02924 mol/liter

 

Therefore Molar concentration of sugar = 0.03 mol L–1


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