QUESTION
A sugar syrup of weight 214.2g contains 34.2g of sugar. Calculate the molal concentration (Molality)
ANSWER
Weight of sugar syrup = 214.2 g
Weight of sugar =34.2g
Molecular mass of sugar = 342 ( 12 *12 + 22*1 +11*16)
a) Number of moles = 34.2/342 =0.1
Weight of water = 214.2-34.2 = 180g
Molal concentration or Molality= (No of moles×1000)/ (Mass of Solvent)
= ( 0.1 × 1000) / 180
= 0.555 = 0.56 mol/ Kg
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