We are being asked to calculate the equilibrium constant, Kc for the given equilibrium reaction:
SCl2(g) + 2 C2H4(g) ↔ S(CH2CH2Cl)2(g)
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
Given: SCl2(g) + 2 C2H4(g) ↔ S(CH2CH2Cl)2(g)
Mustard gas, S(CH2CH2Cl)2 can be made at room temperature as shown:
SCl2(g) + 2 C2H4(g) <=> S(CH2CH2Cl)2(g)
In a particular experiment, 0.816 M of SCl2 and 0.288 M C2H4 were mixed. At equilibrium,
{S(CH2CH2Cl)2(g)} was 0.187 M.
Calculate the value of Kc for the reaction.
Give your answer to 2 decimal places.
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