Consider the generic reaction between reactants A and B:

3A+4B→2C

If a reaction vessel initially contains 9 mol A and 4 mol B, how many moles of A will be in the reaction vessel once the reactants have reacted as much as possible? (Assume 100% actual yield.)

How many moles of B will be in the reaction vessel once the reactants have reacted as much as possible? (Assume 100% actual yield.)

How many moles of C will be in the reaction vessel once the reactants have reacted as much as possible? (Assume 100% actual yield.)

Express your answer using two significant figures.

Reaction:

3A+4B→2C

Stoichiometrial proportions:

3A : 4B : 2C

initial quantities:

9 mol A and 4 mol B.

actual ratio, 9A / 4B > theoretical ratio 3A/4B = > A is in excess and B is the limiting reagent.

Initial moles Consumed moles produced moles Final moles

A 9 3 0 9 - 3 = 6

B 4 4 0 4 - 4 = 0

C 0 0 2 2

That table contains all the answers:

1) how many moles of A will be in the reaction vessel once the reactants have reacted as much as possible? (Assume 100% actual yield.)

6.0 moles

2) How many moles of B will be in the reaction vessel once the reactants have reacted as much as possible? (Assume 100% actual yield.)

0.0 moles

3) How many moles of C will be in the reaction vessel once the reactants have reacted as much as possible? (Assume 100% actual yield.)

2.0 moles