The Solubilities of Ammonium Bromide, NH₄Br, in Water at 0°C

question 47

Multiple Choice

The solubilities of ammonium bromide, NH₄Br, in water at 0°C, 20°C, and 80°C are as follows:
Which of the following fractional crystallization schemes would produce the highest percent yield for the recrystallization of ammonium bromide?

• A) A solution containing 50.5 g NH₄Br in 100.0 g H₂O at 20°C is cooled to 0°C.
• B) A solution containing 115 g NH₄Br in 200 g H₂O at 80°C is cooled to 0°C.
• C) A solution containing 120 g NH₄Br in 100 g H₂O at 80°C is cooled to 20°C.
• D) A solution containing 100 g NH₄Br in 100.0 g H₂O at 80°C is cooled to 20°C.
• E) A solution containing 95 g NH₄Br in 175 g H₂O at 80°C is cooled to 0°C.

Distinguish between discrete and continuous random variables.

Apply probability concepts to determine the probability distributions for discrete random variables.

Understand the concept and characteristics of random variables.

Identify the differences between continuous and discrete random variables.

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