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Mole Concept and Avogadro's Number

Air contains ...

Question

Air contains 20% oxygen by volume. Calculate the theoretical volume of air which will be required for burning $200 m^{3}$ of acetylene gas completely. All volumes are measured under the same conditions of temperature and pressure

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Solution

Thus, 500 m 3 oxygen is required for complete combustion of $200 m^{3}$ of acetylene. 20 m 3 of oxygen is present in 100 m 3 of air.
$500 m^{3}$ of oxygen will be present in $= \frac{100}{20} \times 500 m^{3}$ of air
$= 2500 m^{3}$ of air

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