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Calculate the freezing point of a solution of 1.95 g of naphthalene (C10H8) in 15.50 g of benzene. The freezing point of pure benzene is 5.5°C. Kf = 5.12°C kg/mol

Calculate the freezing point of a solution of 1.95 g of naphthalene (C10H8) in 15.50 g of benzene. The freezing point of pure benzene is 5.5°C. Kf = 5.12°C kg/mol

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Calculate the freezing point of a solution of 1.95 g of naphthalene (C10H8) in 15.50 g of benzene.
The freezing point of pure benzene is 5.5°C.
Kf = 5.12°C kg/mol

Expert Solution
Step 1

This is a depression of freezing point or lowering of freezing point problem. This lowering of the freezing point depends on the amount or number of solute present in the solution. 

The lowering of freezing point(ΔTf) is formulated as

                ΔTf = Kf * m

 Where  Kf is freezing point depression constant

                m is the molality of the solution

                ΔTf  =  freezing point of pure                                   substance - freezing point of solution

 

 

 

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