Ascorbic acid (vitamin C, C6H8O6) is a water-soluble vitamin. A solution containing 81.0 g of ascorbic...

3.8 Ratings (649 Votes)

mass of solution = 81+220 = 301g

The mass percentageÂ Â = 81*100/301 = 26.9%

no of moles of ascorbic acidÂ Â = W/G.M.WtÂ Â = 81/176 = 0.46moles

no of moles of waterÂ Â Â Â Â Â Â Â Â Â Â Â Â = W/G.M.WtÂ Â = 220/18Â Â Â = 12.22 moles

Â Â molae fraction of ascorbic acidÂ Â = no of moles of ascorbic acid/no of moles of ascorbic acid + no of moles of water

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 0.46/0.46+12.22

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 0.46/12.68Â Â = 0.0363

molalityÂ Â Â = W*1000/gram molar mass * weight of solvent

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 81*1000/176*220 = 2.09m

volume of solution = 220/1.22Â Â Â = 180.32ml

molarityÂ Â Â =Â Â 81*1000/176*180.32Â Â = 2.55M

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