Homework Answers
Mw benzoic acid = 122.12
wt benzoic acid = 4.6434g
Now, moles of benzoic acid = 4.6434g / 122.12 = 0.03801
Depression in freezing point = Kf X moles of solute (benzoic acid) X 1000 / wt of solvent (camphor)
Depression in freezing point = 40 X 0.3801 X 1000 / 50.0033
Depression in freezing point = 30.41 oC
From now, Depression in freezing point = Tsolvent - Tsolution
or, Tsolution = Tsolvent - Depression in freezing point
Tsolution = 179.5 - 30.41 = 149.09 oC
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