Question

What do the coefficients in the following balanced chemical equation mean?

2H2 + O2 → 2H2O

A) 2 moles of oxygen and 1 mole of hydrogen in the products

B) 2 moles of hydrogen and 1 mole of oxygen in the products

C) 2 moles of oxygen and 1 mole of hydrogen in the reactants

D) 2 moles of hydrogen and 1 mole of oxygen in the reactants

Answer 1

It's either B or D because there would be 2 coefficients of hydrogen and one of oxygen

Answer 2

In the following balanced equation, the coefficients show that there are 2 moles of hydrogen and 1 mole of oxygen in the reactants.  

• Coefficients refer to the numbers assigned in front of the formulas.  

• In the given reaction, the presence of 2 in front of the hydrogen in the reactants side, and the presence of 2 in front of the H2O on the products side show the coefficients.  

• The coefficients indicate the number of moles of each substance taking part in the reaction. Like in the given reaction, 2 moles of hydrogen react with 1 mole of oxygen and generate 2 moles of H2O.  

Thus, option D is correct, that is, coefficients show that two moles of hydrogen and one mole of oxygen are present on the reactant's side.

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