Problem: A toxicologist studying mustard gas, S(CH2CH2Cl)2, a blistering agent, prepares a mixture of 0.675 M SCl2 and 0.973 M C2H4 and allows it to react at room temperature (20.0°C):SCl2(g) + 2C2H4(g) ⇌ S(CH2CH2Cl)2(g)At equilibrium, [S(CH2CH2Cl)2] = 0.350 M. Calculate Kp.

FREE Expert Solution

Equilibrium equation: SCl2(g) + 2C2H4(g) ⇌ S(CH2CH2Cl)2(g)


When dealing with equilibrium:

• Kc → equilibrium units are in molarity 
• Kp → equilibrium units in terms of pressure


Kc is an equilibrium expression:

Kc=productsreactants=[S(CH2CH2Cl)2][SCl2][C2H4]2


Kp and Kc are related:


Kp=KcRT∆n


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At equilibrium: [S(CH2CH2Cl)2] = x = 0.350 M


  • [SCl2] = 0.675 - 0.350 = 0.325 M
  • [C2H4] = 0.973 - 2(0.350) = 0.273 M


Kc=[S(CH2CH2Cl)2][SCl2][C2H4]2Kc=0.3500.3250.2732

Kc = 14.45

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Problem Details

A toxicologist studying mustard gas, S(CH2CH2Cl)2, a blistering agent, prepares a mixture of 0.675 M SCl2 and 0.973 M C2H4 and allows it to react at room temperature (20.0°C):
SCl2(g) + 2C2H4(g) ⇌ S(CH2CH2Cl)2(g)
At equilibrium, [S(CH2CH2Cl)2] = 0.350 M. Calculate Kp.

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