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Question

# Air is a mixture of gases. By percentage, it is roughly 78 percent nitrogen, 21 percent oxygen, and 1 percent argon. (There are trace amounts of many other gases in air.) if the atmospheric pressure is 760 mmHg, what are the partial pressure of nitrogen, oxygen, and argon in the atmospheric?

Solution

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Given atmospheric pressure is 760 $\mathrm{mm Hg}$

Now since percentage of Nitrogen in atmosphere is 78 , therefore partial pressure of nitrogen is 760 $\mathrm{mm Hg}$ $\times$0.78 = 590 $\mathrm{mm Hg}$

Now since percentage of Oxygen in atmosphere is 21 , therefore partial pressure of Oxygen is 760 $\mathrm{mm Hg}$ $\times$0.21 = 160 $\mathrm{mm Hg}$

Now since percentage of Argon in atmosphere is 1 , therefore partial pressure of Argon is 760 $\mathrm{mm Hg}$ $\times$0.01 = 8 $\mathrm{mm Hg}$

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