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Solid ammonium hydrosulphide (NH4HS) is mixed with arbitrary amounts of gaseous NH3 and H2S, forming a three-constituent system of two phases, undergoing the reaction
NH4HSNH3 + H2S.
(a) How many components are there, and what is the variance?
(b) Assuming that the gaseous phase is a mixture of ideal gases, show that
PNH3PH2S/PNH4HS = K.
(c) If solid NH4HS is placed in an evacuated chamber, how many components are there, and what is the variance?
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