Ch4 + 2o2 ? co2 + 2h2o in the chemical reaction, if 10 moles of h2o are produced, moles of co2 are also produced.

5 moles

Explanation:

This reaction (in the question) is a combustion reaction.

A combustion reaction is a reaction in which a substance (in this case an organic compound) is burnt in excess oxygen to produce carbon dioxide and water.

From the equation in the question, it can be deduced that the moles of the products are in the ratio 1:2 for CO₂ and H₂O respectively. Hence, when 10 moles of H₂O is produced, 5 moles of CO₂ will be produced.

1:2      (from the equation)

5:10   (for the answer)  ⇔ which is still the same as 1:2