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April 25, 2015

Homework Help: chemistry

Posted by maura on Sunday, March 11, 2012 at 8:06pm.

Ammonium bisulfide, NH2HS, forms ammonia NH3, and hydrogen sulfide, H2S through the reaction:
NH4HS (s) <--> NH3(g) + H2S(g)
Kp value of .120 at 25C
in a 5L flask is charged with .300g of H2S at 25C.

A) What are the partial pressures of NH3 and H2S at equilibrium, what are the values of P(NH3) and P(H2S)?
[i have a value of 0.043 for initial pressure of H2S, am i suppose to use this?]

B) What is the mole fraction of H2S in the gas mixture at equilibrium?
[since the temps are the same and they have the same mole to mole ratio is my answer .5?]

C)What is the minimum mass of NH4HS that must be added to the 5L flask when charged with the 0.3 g of H2S at 25C to achieve equilibrium?
[no clue what to do!? any help with these questions would be great! thank you in advance]

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