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Question
200 cm3 of hydrogen and 150 cm3 of oxygen are mixed and ignited, as per the following reaction,
\[\ce{2H2 + O2 → 2H2O}\]
What volume of oxygen remains unreacted?
Solution
\[\ce{2H2 + O2 → 2H2O}\]
2 V 1V 2V
From the equation, 2V of hydrogen reacts with 1V of oxygen
so 200cm3 of Hydrogen reacts with = `200/2`
= 100 cm3
Hence, the unreacted oxygen is 150 −100 = 50cm3 of oxygen.
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