For divers going to great depths, the composition of the air in the tank must be modified. The ideal composition is to have approximately the same number of O2 molecules per unit volume as in surface air (to avoid oxygen poisoning), and to use helium instead of nitrogen for the remainder of the gas (to avoid nitrogen narcosis, which results from nitrogen dissolving in the bloodstream). Of the molecules in dry surface air, 78.0% are N2, 21.0% are O2, and 1.00% are Ar. (Assume that the density of seawater is 1025 kg/m³ and the temperature is 20.0°C.) Density of dry air at 20.0°C is 1.20 kg/m3. Molar mass of N2 is 14.007 g/mol, O2 is 15.999 g/mol, and Ar is 39.948 g/mol. (See Table B.7.)

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Chapter2: The Kinetic Theory Of Gases
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Problem 88AP: Find the total number of collisions between molecules in 1.00 s in 1.00 L of nitrogen gas at...
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Required information
For divers going to great depths, the composition of the air in the tank must be modified. The ideal composition is to
have approximately the same number of O2 molecules per unit volume as in surface air (to avoid oxygen poisoning),
and to use helium instead of nitrogen for the remainder of the gas (to avoid nitrogen narcosis, which results from
nitrogen dissolving in the bloodstream). Of the molecules in dry surface air, 78.0% are N2, 21.0% are 02, and 1.00% are
Ar. (Assume that the density of seawater is 1025 kg/m³ and the temperature is 20.0°C.) Density of dry air at 20.0°C is
1.20 kg/m3. Molar mass of N2 is 14.007 g/mol, 02 is 15.999 g/mol, and Ar is 39.948 g/mol. (See Table B.7.)
For a diver going to a depth of 153 m, what percentage of the gas molecules in the tank should be 02?
| %
Transcribed Image Text:! Required information For divers going to great depths, the composition of the air in the tank must be modified. The ideal composition is to have approximately the same number of O2 molecules per unit volume as in surface air (to avoid oxygen poisoning), and to use helium instead of nitrogen for the remainder of the gas (to avoid nitrogen narcosis, which results from nitrogen dissolving in the bloodstream). Of the molecules in dry surface air, 78.0% are N2, 21.0% are 02, and 1.00% are Ar. (Assume that the density of seawater is 1025 kg/m³ and the temperature is 20.0°C.) Density of dry air at 20.0°C is 1.20 kg/m3. Molar mass of N2 is 14.007 g/mol, 02 is 15.999 g/mol, and Ar is 39.948 g/mol. (See Table B.7.) For a diver going to a depth of 153 m, what percentage of the gas molecules in the tank should be 02? | %
Required information
For divers going to great depths, the composition of the air in the tank must be modified. The ideal composition is to
have approximately the same number of O2 molecules per unit volume as in surface air (to avoid oxygen poisoning),
and to use helium instead of nitrogen for the remainder of the gas (to avoid nitrogen narcosis, which results from
nitrogen dissolving in the bloodstream). Of the molecules in dry surface air, 78.0% are N2, 21.0% are O2, and 1.00% are
Ar. (Assume that the density of seawater is 1025 kg/m³ and the temperature is 20.0°C.) Density of dry air at 20.0°C is
1.20 kg/m3. Molar mass of N2 is 14.007 g/mol, O2 is 15.999 g/mol, and Ar is 39.948 g/mol. (See Table B.7.)
How many 02 molecules per cubic meter are there in surface air at 20.0°C and 1.00 atm?
m
-3
Transcribed Image Text:Required information For divers going to great depths, the composition of the air in the tank must be modified. The ideal composition is to have approximately the same number of O2 molecules per unit volume as in surface air (to avoid oxygen poisoning), and to use helium instead of nitrogen for the remainder of the gas (to avoid nitrogen narcosis, which results from nitrogen dissolving in the bloodstream). Of the molecules in dry surface air, 78.0% are N2, 21.0% are O2, and 1.00% are Ar. (Assume that the density of seawater is 1025 kg/m³ and the temperature is 20.0°C.) Density of dry air at 20.0°C is 1.20 kg/m3. Molar mass of N2 is 14.007 g/mol, O2 is 15.999 g/mol, and Ar is 39.948 g/mol. (See Table B.7.) How many 02 molecules per cubic meter are there in surface air at 20.0°C and 1.00 atm? m -3
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