Problem 2 , Question1. You obtained the following graphical data from two experi

Question

Problem 2, Question1.

You obtained the following graphical data from two experimental runs to determine the freezing point depression constant for a pure solvent. The solution was made up by adding 3.025 g of naphthalene, C10H8, to 45.320 g of pure solvent.

1.What is the freezing point temperature of the pure solvent (in oC)?

2.What is the solution freezing point temperature (in oC)?

4.What is the molar mass of naphthalene (in g/mol)?

5.How many moles of naphthalene are in the solution?

6.What is the molality of the solution (in mol/kg-solvent)?

7.What is the freezing point depression constant, kfp, of the pure solvent (inoC/m)?

Explanation / Answer

as the image attachted is not opening .so i can see the graph and can only solve 4 and 5

4.

molar mass of napthalene = 10×mass of Carbon +8× mass of Hydrogen= 10×12+8×1.008 g =128.064 g

5. no. of moles of napthalene = 3.025/128.064

0.024

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