could you answer all of these please? ndow Help ngagenow.com Review Topics Use t

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could you answer all of these please? ndow Help ngagenow.com Review Topics Use the References to access important values if needed for this question. Match the following aqueous solutions with the appropriate letter from the column on the right. 1, 0.22 m MgSO, A. Highest boiling point 2.0.16 m CaBr B. Second highest boiling point 3.0.15 m MnCI C. Third highest boiling point 4. 0.40 m Sucrose(nonelectrolyte) D. Lowest boiling point Submit Answer Retry Entire Group 8 more group attempts remaining

Explanation / Answer

change in boiling point = molality x boiling point constant for water (0.51 °C/m) x i

where i is the number of ions produced when dissolved in aqueous solution. For example: i for NaCl is 2 and for BaCl2 it is 3.

Therefore, a 3 m NaCl solution will have a change in boiling point of:

change = (3 m)(0.51°C/m)(2) = 3.06°C.

Since the boiling pt. of pure water is 100°C, the boiling point of the NaCl solution will be 103.06oC

change in freezing point = molality x freezing point constant for water (1.86 °C/m) x i

Therefore, a 3 m NaCl solution will have a change in freezing point of:

change = (3 m)(1.86°C/m)(2) = 11.16°C

Since the freezing pt. of pure water is 0°C, the freezing point of the NaCl solution will be -11.16°C.

Using these concepts we can solve MCQs as follows:

First Question

1 - C

2 - A

3 - B

4 - D

Second Question

1 - D

2 - C

3 - A

4 - B

Third Question

1 - C

2 - B

3 - D

4 - A

Fourth Question

1 - A

2 - B

3 - D

4 - C

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