For this reaction: 3A + 2B + C ---> Product, answer the following:?

Question

A) Give the rate equation.
B) Give the overall order of the reaction (as a number).
C) Give the order of the reaction (as a number) with respect to B.
D) What is the order of the reaction (as a number) with respect to B, if B is in excess?
E) What is the overall order of the reaction (as a number), if B is in excess?

Answer 1

A
Assume that is an elementary reaction. Then the reaction rate is proportional to concentration of each reactant raised to the power of its stoichiometric coefficient. The rate equation is:
r = k·[A]³·[B]²·[C]

B
This is the sum of the exponents:
n = 3+2+1 = 6

C
the exponent of [B] :
2

D
If a reactant is in excess, its change of concentration is negligible. The concentration remains at its initial level:
[B] ≈ [B]₀. Therefore the reaction can be treated as independent from [B]:
r ≈ k·[A]³·[B]₀²·[C] = k'·[A]³·[C]
where k = k·[B]₀² is constant.
Because the rate of reaction is independent from [B] the answer is 0

E
As shown in D the rate of reaction depends only on [A] and [C] the overall order is:
n' = 3 + 1= 4

NOTE:
The preliminary assumption of an elementary reaction is very doubtful. According to collision theory elementary reactions occur with maximum of two molecules as reactants. Here we got six!. The real reaction mechanism will consist of set of elementary reactions, which may lead to a complex overall rate of reaction. Sometimes (or for certain range of concentration) the proposed elementary rate of reaction will match this complex rate equation, quite often it does not.
Anyway without any further information, you have not other possibility to state a rate of reaction than the elementary rate. But this is rather a first guess than a fact.

Answer 2

once you're right here for getting to know Chemistry, all of those solutions are the perfect option. For Jeff Nowlin, examine to verify you have the comparable known equation that produces the comparable deltaH=163kJ

Answer 3

Simple - it is completely impossible to write the rate equation from the balanced chemical equation. There is usually no relationship whatsoever.

Get a new chemistry teacher, or whoever set this question.

Answer 4

This can only be found from experimental data, not the stoichiometry.