We are being asked to calculate the concentration of PH3 and BCl3 at equilibrium:
PH3BCl3(s) ⇌ PH3(g) + BCl3(g) Kc = 1.87×10–3
When dealing with equilibrium and Kc:
• Kc → equilibrium units are in molarity
• Kc is an equilibrium expression:
▪ only aqueous and gaseous species are included in the equilibrium expression
▪ the coefficient of each compound in the reaction equation will be the exponent of the concentrations in the equilibrium expression
We're going to calculate for the final concentration of HI(g) using the following steps:
At 80°C, Kc = 1.87×10–3 for the reaction PH3BCl3(s) ⇌ PH3(g) + BCl3(g)
Part A. Calculate the equilibrium concentration of PH3 if a solid sample of PH3BCl3 is placed in a closed vessel at 80°C and decomposes until equilibrium is reached. Express your answer with the appropriate units.
Part B. Calculate the equilibrium concentration of BCl3 if a solid sample of PH3BCl3 is placed in a closed vessel at 80°C and decomposes until equilibrium is reached. Express your answer with the appropriate units.
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