How can you tell if a problem is a limiting reactant problem or if it is a regular stoichiometry problem?

A limiting reactant problem will most likely give the starting amounts of reactants, but you won't be told which reactant is going to determine the regular stoichiometry problem. I hope this helps  

Explanation:

consider the reaction below.

 no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

24