Consider the following generic chemical reaction:

2A+3B→3C How many moles of B are required to completely react with: 8 mol of A, 9 mol of A, 3 mol of A, and 10 mol of A?

The number of moles of B that will completely react with;

8 moles of A is 12 moles of B

9 moles of A is 13.5 moles of B

3 moles of A is 4.5 moles of B

10 moles of A is 15 moles of B

Explanation:

From the reaction, we have the mole ratio of the reactants is 2 moles of A combines with 3 moles of B to form 3 moles of C

Therefore, one mole of A which is 2 moles/2 will combine with 3/2 moles of B

Hence 8 moles of A will combine with 8*3/2 or 12 moles of B

9 moles of A will combine with 9*3/2 or 13.5 moles of B

3 moles of A will combine with 3*3/2 or 4.5 moles of B

10 moles of A will combine with 10*3/2 or 15 moles of B