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    Any help on this kinetics question would be greatly appreciated:

    The question is about chlorine; in parts a and b we work out arrhenius' constant, activation energy and the mean speed.

    Part c asks "given that chlorine atoms may be considered as hard spheres of radius 0.08nm calculate the collision cross section for gaseous atoms"... this is fine, I've used sigma = pi * d^2

    Then it asks "hence derive an expression for the single atom collision frequency, and the total collision frequency and evaluate them at T=268.2K"

    I have z = sigma * sqrt2 * <s> * p / k * T and have all the information to put in apart from pressure? Any ideas?

    I can't sub it for N/V either as I don't have either of those.
 
 
 
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