The amount off oxygen present in the blood depends in part on the partial pressu

Question

The amount off oxygen present in the blood depends in part on the partial pressure of inspired oxygen in the trachea, P_Ioc. This can be calculated from the barometric pressure, the fraction of O_2 molecules in dry air, and the vapor pressure of water at body temperature (because inhaled air is humidified in the trachea). 20.9% of the molecules in dry air are O_2, molecules and the vapor pressure of water at body temperature (37 degree C) is 47 mm Hg. Taking the total pressure of the humidified inhaled air to be equal to the barometric pressure, calculate the P_Ioc for a person in Albuquerque, NM (elevation 1620 meters), if the prevailing barometric pressure is 608 mm Hg. P_Ioc = mm Hg A mixture of hydrogen and krypton gases is maintained in a 8.75L flask at a temperature of 14 degree C. If the partial pressure of hydrogen is 0.294 atm and the partial pressure of krypton is 0.364 atm, what is the total pressure in the flask? atm

Explanation / Answer

Q1.

x-O2 = 0.209

Pvapor = 47 mm Hg

Ptotal = 608 mm Hg

then...

Pair = Ptotal - Pvapor = 608-47 = 561 mm Hg

P-O2 = x-O2 * Pair = 0.209*561 = 117.249 mm Hg

the oxygen pressure will be then 117.249 mm Hg

Q2.

H2 and Kr are present...

V = 8.75 L, T = 14°C = 287 K,

P-H2 = 0.294 atm

P-Kr = 0.364 atm

find totla P

Note that

the total pressure of a container = Sum of individual pressures

since the mix has only hydrogen + krypton

then

Ptotal == P-Kr + P-Hyrogen = 0.294 + 0.364 = 0.658 atm

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