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The total pressure of a mixture of non-reacting gases is $750 mm Hg$ . If the mole fraction of $CO X_{2}$ is $0.2$ , its partial pressure is

A $150 mm Hg$
B $600 mm Hg$
C $375 mm Hg$
D $75 mm Hg$

Answer: A

Dalton's law:

p_{CO X_{2}} = x_{CO X_{2}} P = 0.2 \times 750 = 150 mm Hg

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