The composition of earths dry atmosphere is #78.8% N_2#, #21.0% O_2#, and #1.00% Ar#. Using the atospheric pressure recorded, which was 763 mm Hg with and an ambient temperature of 25 C, how do you calculate the partial pressures of these three gases?

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Answer 1 · 2016-08-14T05:57:07

The partial pressure of each gas is simply the individual percentage of the measured pressure.

And thus #P_"dinitrogen"# #=# #78.8%xx763*mm*Hg#.

And #P_"dioxygen"# #=# #21.0%xx763*mm*Hg#.........etc.

And the sum of the individual partial pressures is necessarily the overall pressure, #P=763*mm*Hg#