Molality of the unknown solution? Molar mass of the unknown? Number Unit 9.757 M

Question

Molality of the unknown solution?
Molar mass of the unknown? Number Unit 9.757 Mass of BHT for trials 1 and 2 9.757 Mass of BHT for trail 3 same as 1 and 2 Mass of dichlorobenzene for trial 3 Mass of BHT for trial 4 9.834 Mass of Unknown for trial 4. .802 Letter of Unknown me and Temperature Data should be on your lab sheets sis #2 Unit Temperature Melting Point Trial 1 pure BHT Melting Point Trial 2 ure BHT Average Melting Point Trial 1 and 2 69 Melting Point Trial 3 BHT dichlorobenzene 63 Melting Point Trial 4 BHT unknown 63.8 Analyus 3 Use Average of Trial 1 and 2 for pure BH Value Unit Kf for BHT Incorrect Molality of unknown solution correct un Molar Mass of Unknownl

Explanation / Answer

dTf = 69-63 = 6

Freezing point constant Kf = dTf/im

                                           = 6 x 0.009757 x 112.56/1 x 0.715

                                           = 9.24 oC/m

dTf for 4 = 69 - 63.8 = 5.2 oC

Kf for BHT = literature = 11.1 oC/m

molality of unknown = 5.2/11.1 = 0.47 M

moles of unknown = 0.47 x 0.009834 = 0.00462 mols

molar mass of unknown = 0.802/0.00462 = 174 g/mol

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