Question 11

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?


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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