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Stoichiometric Calculations

What volume o...

Question

What volume of oxygen gas measured at $0^{\circ} C$ and 1 atm pressure is needed to burn 1 L of propane gas completely, measured under the same conditions?

10 L

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7 L

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6 L

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5 L

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Solution

The correct option is D 5 L
$C_{3} H_{8} + 5 O_{2} \to 3 C O_{2} + 4 H_{2} O$
At STP, 1 mole of a gas occupies 22.4 L
22.4 L of propane reacts with $5 \times 22.4$ L of $O_{2}$
So, 1 L mole of propane gas will require 5 L of $O_{2}$ for complete combustion.

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