- #1

songoku

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- Homework Statement
- The concentration of oxygen O2 at the atmospheric pressure is 20.9% v/v. The partial pressure of this concentration is 21.2 kPa. At an altitude of 6962 m above sea level (approximately 7000 m), what is the partial pressure of oxygen?

a. 44 kPa

b. 9.33 kPa

c. 0.21 kPa

d. 0.44 kPa

e. 21 kPa

- Relevant Equations
- Not sure (maybe ideal gas or P = ρgh)

The pressure of oxygen at sea level = ##\frac{20.9}{100} ~\text{x} ~(21.2 ~\text{x} ~ 10^3) = 4430.8~ \text{Pa}##

Then I do not know how to calculate the pressure at altitude 7000 m. I tried using P = ρgh (taking ρ as density of air = 1.3 kg/m

Thanks

Then I do not know how to calculate the pressure at altitude 7000 m. I tried using P = ρgh (taking ρ as density of air = 1.3 kg/m

^{3}) then subtract the result from 4430.8 Pa but got negative result so I guess the formula I used is wrong but I do not know what other formula to use.Thanks