Homework Help: Chemistry

Posted by Paul on Thursday, January 13, 2011 at 2:14pm.

NH4HS(s) NH3(g) + H2S(g) ∆H_ = +93 kilojoules

The equilibrium above is established by placing solid NH4HS in an evacuated container at 25°C. At equilibrium, some solid NH4HS remains in the container. Predict and explain each of the following.

(a) The effect on the equilibrium partial pressure of NH3 gas when additional solid NH4HS is introduced into the container

b) The effect on the equilibrium partial pressure of NH3 gas when additional solid H2S is introduced into the container

c) The effect on the mass of solid NH4HS present when the volume of the container is decreased
(d) The effect on the mass of solid NH4HS present when the temperature is increased.

Chemistry - DrBob222, Thursday, January 13, 2011 at 3:10pm
You need an arrow. How do you which are the products and which the reactants?
a) If there is solid NH4HS initially, adding more solid NH4HS will not cause the equilibrium to change; therefore, no effect.

b) Confusing. There is NO solid H2S present initially; therefore, how can ADDITIONAL solid H2S be added.

c)Volume is decreased, pressure is increased. Equilibrium changes to the side with the smaller number of moles; therefore, the equilibrium will shift to the left and NH3 will be decreased, H2S is decreased, mass of NH4HS is increased.

d) This is an endothermic reaction which can be written as
NH4HS(s) + heat ==> NH3(g) + H2S(g)
Adding heat will shift the equilibrium to the right; therefore, the mass of the NH4HS will decrease.

Answer this Question

Related Questions

Chemistry - NH4HS(s )<=>NH3(g)+ H2S(g) ∆H = +93 ...
AP CHEM - I would really appreciate some help on this problem. =) At 218 C, Kc...
chemistry - At 23°C, Kp = 0.075 for the equilibrium: NH4HS (s) ↔ ...
chemistry, plz check work - NH3+H2S-->NH4HS <-- Kc=400 at 35 ...
chem - The decomposition of ammonium hydrogen sulfide that is shown below is an ...
chem - Consider the decomposition of ammonium hydrogen sulfide: NH4Hs(s) &lt...
chemistry - Ammonium bisulfide, NH2HS, forms ammonia NH3, and hydrogen sulfide, ...
CHEM HELP! - NH4HS<-->NH3+H2S What is the minimum mass of NH4HS ...
chm152 - When solid NH4HS is placed in a closed flask at 28 C, the solid ...
Chemistry - For the following reaction, the equilibrium constant KC = 97.0 at ...

For Further Reading

First Name:
School Subject:
Answer: