February 25, 2017

Homework Help: Chemistry

Posted by Donna on Wednesday, May 21, 2008 at 12:47am.

Write rate law expressions?
2NOCl(g) --> 2NO(g) + Cl2(g)
S2O3^2-(aq) + H^+(aq) --> HSO3^-(aq) + S(s)

(Sulfur initially forms a colloid solution so it can be treated as aqueous.)

(1) Write the rate law expression for the above reactions, assuming these are elementary.

(2) If total pressure in the system is doubled, how will it affect the rate of the reaction in each case?

1. So since these are elementary, I think they're written just like this:

rate = k[NOCl]
rate = k[S2O3^2-][H^+]

2. For gaseous reactions, when pressure increases the rate of reaction increases, so the first one would have an increased rate of reaction.

I'm not really sure about the second one though. Tell me if I'm thinking about this the right way: since the reaction is aqueous and nothing is gaseous, then pressure will not affect the rate of reaction


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