Use the information below to solve the next two questions: An ideal solution is

Question

Use the information below to solve the next two questions: An ideal solution is prepared by dissolving 6.0 g of urea, CO(NH_2)_2 in 32.0 of methanol, C vapor pressure of pure methanol at 20 degree C is 89 mmHg. Calculate the mole fraction of urea in the solution above. A) 0.91 B) 0.84 C) 0.091 D) 0.16 Calculate the vapor pressure lowering (Delta P) for the methanol solution described above. A) 14 mmHg B) 8.1 mmHg C) 81 mmHg D) 6.0 mmHg Which of the following solutions would be expected to have the lowest freezing point? A) 0.030 m CaSO_4 B) 0.030 m acetic acid, HC_2H_3O_2 C) 0.030 m urea, CO(NH_2)_2 D) 0.030 m BaCl_2

Explanation / Answer

Ans 1. C . 0.091

Number of moles of urea = 6/60 = 0.1

Number of moles of methanol = 32 /32 = 1

mole fraction of urea = 0.1 / (0.1 + 1)

=0.091

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