When a hydrocarbon A undergoes combustion in the presence of air, it requires 9.5 equivalents of oxygen and produces 3 equivalents of water. What is the molecular formula of A?
Solution
<p>$${C_x}{H_y} + \left( {x + {y \over 4}} \right){O_2} \to xC{O_2} + {y \over 2}{H_2}O$$</p>
<p>${y \over 2} = 3$</p>
<p>$y = 6$</p>
<p>$x + {y \over 4} = {{19} \over 2}$</p>
<p>$x = {{19} \over 2} - {3 \over 2} = 8$</p>
<p>So, formula is ${C_8}{H_6}$.</p>
About this question
Subject: Chemistry · Chapter: Some Basic Concepts of Chemistry · Topic: Mole Concept
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