The composition of dry air is approximately 78% nitrogen, 21% oxygen, and 1% other gases. What is the partial pressure of nitrogen at standard atmospheric pressure?

Jul 3, 2017

Well approx. $\frac{4}{5} \cdot a t m$.........

Explanation:

So partial pressures of the constituent gases are.......

${P}_{{N}_{2}} = 0.78 \times 1 \cdot a t m$; ${P}_{{O}_{2}} = 0.21 \times 1 \cdot a t m$; and ${P}_{\text{other gases}} = 0.01 \times 1 \cdot a t m$.

Does the sum of the partial pressures add up to ${P}_{\text{atmospheric}}$? Why should it?