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May 29, 2015

Homework Help: AP CHEM

Posted by Ashley on Saturday, February 7, 2009 at 12:13am.

Kc = 1.87 10-3 for the following reaction.
PH3BCl3(s)=>PH3(g) + BCl3(g)
(a) Calculate the equilibrium concentrations of PH3 and BCl3 if a solid sample of PH3BCl3 is placed in a closed vessel and decomposes until equilibrium is reached.
(b) If the flask has a volume of 0.400 L, what is the minimum mass of PH3BCl3(s) that must be added to the flask in order to achieve equilibrium?

I got part a (0.0432 M) but I can't get part b, please help!

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