1) Recall: Cx (concentration) Px (partial pressure) Sx (solubility) where solubi
ID: 1034624 • Letter: 1
Question
1) Recall: Cx (concentration) Px (partial pressure) Sx (solubility) where solubility has units of (mol/L)/pressure which is equal to mol/(L * pressure) Coke8 is packaged at 2.4 atm of CO2 and roughly 25°C: the CO2 solubility in water at that temp is 0.0336 (mol/L) /atm- 0.0336 mol/(L *atm) So what is the CO2 content of per liter of coke? (4 points) a) b) in mol in mL CO2 (STP) 2) The barometric pressure on top of Mt. Everest is 250 mmHg. At an ambient temp of-30°C and 50% relative humidity, what is the PO2 a) in the atmospheric air and b) in the mammalian lung (assume that PCO2 is "normal"). Can ignore the RER for part (b). Early text books flatly stated no one would ever summit Everest without supplemental oxygen, now you see why. Reinhold Messner was the first to summit Everest with no supplemental oxygen in 1978. C) Should a person eat a diet of fat or carbohydrates on Everest? Explain why (with numbers!)** (5 points) a) b) c) 3) Lance Armstrong (fully doped) had a maximum oxygen consumption (3) of 5.5 liters O,/min. If during maximum exertion his arterial oxygen content is 20 ml/100 ml blood and his venous content is 2 ml/100ml blood, a) calculate his cardiac output. In mammals in general, blood volume is equal to 7% of body mass (assume one liter of blood weighs 1.0 kg). If he weighs 65kg b) during this maximum exertion how long will it take to circulate his entire blood volume (i.e., how long for heart to pump his blood volume once?) (3 points) Potentially useful information: PV - nRT, one mole of STP gas occupies 22.4L. Saturation water vapor at 37°C is 47 mmHg, at 25°C is 24 mmHg and at-30°C is 0.4 mmHg. Atmospheric air is 21%?2. Sea level barometric pressure (Pb) Is 760 mmHg ???? = 0.21 (R-47) _ Paco:RER (As arterial a zalveolar) Note RER - respiratory exchange ratio - CO2 produced / O2 consumed normal value: PaCO2-40 mmHg Fick equation: = COCa02-CK) where CO = cardiac output. **Use textbook RER values for fat: 0.7, Protein: 0.8 and Carbs: 1Explanation / Answer
1) Here Px = 2.4 atm and Sx = 0.0336 mol / (L*atm)
a) So the Conentration of CO2 = 2.4 atm * 0.0336 mol / (L*atm)
= 0.08064 mol / L
b) One mole of STP gas occupies 22.4 L volume
So total CO2 contain in ml = 0.08064 * 22.4 L = 1.8063 L = 1806.3 ml
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