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Standard XII

Chemistry

Real Gases

2 L of H2 a...

Question

2 L of $H_{2}$ and 2L of $O_{2}$ are mixed at $10^{o} C$ and 1 atm. An electric spark is passed through the mixture, upon which there is a 'pop'. On bringing back the temperature and pressure to the original values, what will be the volume of the gas left?

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Solution

The equation for the reaction between hydrogen and oxygen can be written as:
$2 H_{2} + O_{2} \to 2 H_{2} O$

Therefore the volume ratio is = 2: 1: 2

Given that 2L of $H_{2}$ and 2L of $O_{2}$ are made to react together, but according to the reacting volume ratio, 2L of hydrogen needs 1 L of oxygen.

Therefore 1 L of oxygen remains unreacted.

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