If you have 4.0 moles of hydrogen and 3.0 moles of oxygen, which will be the limiting reactant? H2O

O2

There is no limiting reactant.

H2

H2 is the limiting reactant.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

2H2 + O2 —> 2H2O

Next, we shall determine the limiting reactant as follow:

From the balanced equation above,

2 moles of H2 reacted with 1 mole of O2.

Therefore, 4 moles of H2 will react with = (4 x 1)/2 = 2 moles of O2.

From the calculations made above, we can see that only 2 moles out of 3 moles of O2 given, is needed react completely with 4 moles of H2.

Therefore, H2 is the limiting reactant and O2 is the excess reactant.

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