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Dry air contains at one atmosphere pressure contains $$78\%$$ nitrogen $$21\%$$ oxygen and $$1\%$$ other gases. The partial pressure of other gases is $$a \times 10^{-2}$$ atm where $$a$$ is ___.
Correct Answer: 1
By Dalton's law, the partial pressure of a component is its mole fraction times the total pressure. For the other gases this is $$0.01 \times 1 = 1 \times 10^{-2}\text{ atm}$$, so $$a = 1$$.
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