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April 21, 2014

Homework Help: CHEM HELP!!!

Posted by Taylor on Monday, February 13, 2012 at 12:00am.

I don't get two questions out of my homework and I know the answers to them but just not how the answers were gotten. PLEASE HELP!!

1) A handbook gives the aqueous solubility of carbon monoxide at 0 C and 1 atm CO pressure to be 0.0354 mg CO per mL of solution. What would be the molarity of CO in water if the partial pressure of CO is 0.00036 atm? ANS. is 4.5*10^-7

2) The solubilities of ammonium bromide in water is as follows:
T (C) Sol. g NH4Br/100g H20
0 60.5
20 76.4
80 125

Which of the following fractional crystallization schemes would produce the highest prescient yield for the the recrystallization of ammonium bromide?

a) a solution containing 120 g NH4Br in 100 g H20 at 80 C is cooled to 20 C
b) a solution containing 95 g NH4Br in 175 g H20 at 80 C is cooled to 0 C
c) a solution containing 115 g NH4Br in 200 g H20 at 80 C is cooled to 0 C
d) a solution containing 100 g NH4Br in 100 g H20 at 80 C is cooled to 20 C
e) a solution containing 50.5 NH4Br in 100 g H20 at 20 C is cooled to 0 C

ANS: A

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