Practice Limiting Reactant in Chemistry

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

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Quick Recap

The reactant that is completely consumed first in a chemical reaction, thereby determining the maximum amount of product that can be formed.

If you have 10 buns and 5 patties, you can only make 5 burgers—patties are limiting.

Showing a random 20 of 50 problems.

Example 1

medium
If 4.0 mol of H2 reacts with 1.0 mol of O2 in the reaction 2H2+O2→2H2O, which is the limiting reactant?

Example 2

easy
If reactant X gives 4 mol product and reactant Y gives 6 mol product, which is limiting?

Example 3

medium
Which is limiting in A+3B→C when you have 5 mol A and 9 mol B?

Example 4

medium
For 2Al+3Cl2→2AlCl3 with 4 mol Al and 5 mol Cl2, how many mol of AlCl3 form?

Example 5

easy
In a sandwich shop, each sandwich needs 2 slices of bread and 1 slice of cheese. With 20 slices of bread and 8 slices of cheese, which is limiting?

Example 6

medium
In CH4+2O2→CO2+2H2O, you have 2 mol CH4 and 3 mol O2. Which is limiting?

Example 7

hard
Using 2H2+O2→2H2O with 6 mol H2 and 2 mol O2, how many mol of H2 are left over?

Example 8

medium
For CaCO3+2HCl→CaCl2+H2O+CO2, with 1.0 mol CaCO3 and 1.0 mol HCl, which is limiting?

Example 9

medium
In 2Al+3Cl2→2AlCl3 with 2 mol Al and 2 mol Cl2, which is limiting?

Example 10

medium
For S+O2→SO2 with 3.2 g S (M = 32.0) and 3.2 g O2 (M = 32.0), which is limiting?

Example 11

easy
A recipe needs 2 eggs and 1 cup of flour per cake. You have 10 eggs and 4 cups of flour. Which ingredient is the limiting 'reactant'?

Example 12

medium
In 2H2+O2→2H2O with 4 g H2 (M=2) and 16 g O2 (M=32), which is limiting?

Example 13

hard
If 0.50 mol of Al reacts with 0.60 mol of Br2 in 2Al+3Br2→2AlBr3, how many mol of AlBr3 form?

Example 14

medium
In a reaction A+2B→C, if you have 3 mol of A and 4 mol of B, which is limiting?

Example 15

easy
True or false: The reactant present in the largest amount is always the limiting reactant.

Example 16

easy
Why must you find the limiting reactant before computing product?

Example 17

challenge
In 2Al+3Cl2→2AlCl3 with 4 mol Al and 3 mol Cl2, how much AlCl3 and which is in excess?

Example 18

medium
In A+2B→C with 3 mol A and 4 mol B, which is limiting and how much C?

Example 19

easy
Fill in the blank: The reactant left over after a reaction finishes is called the ____ reactant.

Example 20

medium
After running N2+3H2→2NH3 with 2 mol N2 and 5 mol H2, how many mol of N2 remain?
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