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Chemistry check please... Thank you!
1. The partial pressure of oxygen at 310 K in one lung (3.0 L) is 21.3 kPa. How many moles of oxygen are in that lung?
0.025
2. You collect hydrogen gas over water at 323 K. The partial pressure of hydrogen is 122.4, and the total pressure is 134.7 kPa. What is the pressure of the water vapor?
12.3 kPa
3. Trimix 10/50 is a gas mixture that contains 10% oxygen and 50% helium, and the rest is nitrogen. If a tank of Trimix 10/50 has a total pressure of 2.07 _ 104 kPa, then what is the partial pressure of oxygen?
2.07 * 103 kPa

Respuesta :

scme1702
1) We apply the ideal gas equation:
PV = nRT
n = (21300 x 3/1000) / (8.314 x 323)
n = 0.024
Your answer is correct.

2) Total pressure = Partial pressure of Hydrogen + Partial pressure of water
134.7  = 122.4 + Pw
Pw = 12.3 kPa
Your answer is correct

3) The molar fraction, volume fraction and pressure fraction of gasses are the same thing.
Thus, percentage pressure of Oxygen = 10%
Pressure of Oxygen = 2.04 x 10⁴ x 0.1
= 2.04 x 10³ kPa
Your answer is correct

Well done!

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