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Assume that air is 21% oxygen and 79% nitrogen by volume. If the barometric pressure ts740 mm, the partial pressure of oxygen is closest to which one of the following?

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155.4 mm

310 mm

580 mm

740 mm

answer is A.

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Detailed Solution

$P_{O_{2}}^{'} = P \times mole fraction of O_{2}$
$P_{O_{2}}^{'} = 740 \times \frac{21}{100} = 155 .4 mm$

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