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An aqueous solution of a weak monobasic acid containing 0.1g in 21.7g of water freezes at 272.813K. If the value of Kf for water is 1.86K/m, what is the molecular mass of the monobasic acid? Hope someone can answer this ASAP, I`ll be grateful. :)

An aqueous solution of a weak monobasic acid containing 0.1g in 21.7g of water freezes at 272.813K. If the value of Kf for water is 1.86K/m, what is the molecular mass of the monobasic acid? Hope someone can answer this ASAP, I`ll be grateful. :)

Grade:12th pass

1 Answers

Vikas TU
14149 Points
7 years ago
We know that,
Tf = i Kf m
where m is the molality.
Putting all the values,
272.813 = 2* 1.86 * m
m = 73.33 
Therefore,
73.33 = (0.1/M)/(21.7/1000)
Solving for M,
we get M = 0.6628 g

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