Question

State whether each of these statements about reactions involving two reactants is correct, and why it is correct or incorrect. A) In a reaction, both reactants can be limiting. B)In a reaction, both reactants can be in excess. C) In a reaction, one reactant can be limiting and one can be in excess. Make sure to explain why.

Answer 1

A) In a reaction, both reactants can be limiting. (correct)

suppose if we take 6 g H2 and 28 g N2 react with each then formed ammonia

in this case both are limiting reagents .

N2 + 3H2 ----------------> 2NH3

28g 6g 34g

B) In a reaction, both reactants can be in excess. ( incorrect)

in it not possible one reactant only excess or none

3 g H2 react with 28 g N2 then NH3 formed

N2 + 3H2 -------------> 2NH3

28g 6g 34g

28g 3g ?

so limiting reagent is H2 and excess reagent is N2

C) In a reaction, one reactant can be limiting and one can be in excess. (correct)

3 g H2 react with 28 g N2 then NH3 formed

N2 + 3H2 -------------> 2NH3

28g 6g 34g

28g 3g ?

so limiting reagent is H2 and excess reagent is N2