Author Question: The freezing point of pure benzene was measured as 5.49 C. With the same benzene and the same ... (Read 139 times)

vHAUNG6011 · **on:** Jul 8, 2021

Question 1

The freezing point of a solution made by dissolving 8.9 g of MgCl₂ in 98 g H₂O is -4.3 °C. K_f for water is 1.86 °C m^-1. The van't Hoff i factor for this solution is ________.
◦ 1.2
◦ 2.7
◦ 2.4
◦ 2.0
◦ 3.0

Question 2

The freezing point of pure benzene was measured as 5.49 °C. With the same benzene and the same equipment, the freezing point of a solution containing 6.60 g of an unknown molecular compound in 140 g of benzene was found to be 2.35 °C. The cryoscopic constant, K_f, for benzene is 5.12 °C kg/mol. Calculate the mole weight of the unknown.
◦ 103 g/mol
◦ 76.9 g/mol
◦ 44.0 g/mol
◦ 28.9 g/mol
◦ 17.4 g/mol

Liamb2179 · **Reply #1 on:** Jul 8, 2021

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