Question

When 1 volume of gas R reacts with exactly 5 volumes of oxygen, it forms carbon dioxide and water only. What is R? *

Answer 1

Answer: C₃H₈ , which is propane.

Explanation:

Hydrocarbons are organic compounds that on combustion to the formation of CO₂ and H₂O only.

So the equation for balancing any hydrocarbon combustion reaction is:

CₓHᵧ + (x + y/4) O₂ => x CO₂ + y/2 H₂0

On trial and error, we get :

x = 3

y = 8

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