You have completed several dives using SCUBA apparatus and are ready for a deep dive in seawater. You have arranged to have tanks of heliox prepared for your dive. Heliox is a mixture of helium and oxygen. Oxygen at pressures much greater than 1 atm is toxic to lung cells, so you want partial pressure of a gas in a mixture is the pressure the gas would have if it existed by itself in the same volume. Dalton's law of partial pressures tells us that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the individual gases. (The density of seawater is 1,030 kg/m. Assume the air pressure at sea level is 1 atm.) keep the partial pressure of oxygen from your diving equipment at 1 atm or less during your dive. You will be diving at a depth of h= 41.8 m. What ratio of helium to oxygen, by weight, should you request for the mixtures in your tanks? The WHe - 0.77 Wo

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Chapter16: Temperature And The Kinetic Theory Of Gases
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You have completed several dives using SCUBA apparatus and are ready for a deep dive in seawater. You have arranged to have tanks of heliox prepared for your dive. Heliox is a mixture of helium and oxygen. Oxygen at pressures much greater than 1 atm is toxic to
lung cells, so you want to keep the partial pressure of oxygen from your diving equipment at 1 atm or less during your dive. You will be diving at a depth of h = 41.8 m. What ratio of helium to oxygen, by weight, should you request for the mixtures in your tanks? The
partial pressure of a gas in a mixture is the pressure the gas would have if it existed by itself in the same volume. Dalton's law of partial pressures tells us that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the individual gases.
(The density of seawater is 1,030 kg/m³. Assume the air pressure at sea level is 1 atm.)
WHe
= 0.77
Wo2
Find the ratio of numbers of molecules for the two gases first, demanding that the oxygen pressure be atmospheric and that the total pressure of both gases must be equal to the water pressure at the given depth.
Transcribed Image Text:You have completed several dives using SCUBA apparatus and are ready for a deep dive in seawater. You have arranged to have tanks of heliox prepared for your dive. Heliox is a mixture of helium and oxygen. Oxygen at pressures much greater than 1 atm is toxic to lung cells, so you want to keep the partial pressure of oxygen from your diving equipment at 1 atm or less during your dive. You will be diving at a depth of h = 41.8 m. What ratio of helium to oxygen, by weight, should you request for the mixtures in your tanks? The partial pressure of a gas in a mixture is the pressure the gas would have if it existed by itself in the same volume. Dalton's law of partial pressures tells us that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the individual gases. (The density of seawater is 1,030 kg/m³. Assume the air pressure at sea level is 1 atm.) WHe = 0.77 Wo2 Find the ratio of numbers of molecules for the two gases first, demanding that the oxygen pressure be atmospheric and that the total pressure of both gases must be equal to the water pressure at the given depth.
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