Concept explainers
Interpretation:
The total pressure (in atm) of a 15.0-L container at 28°C that contains N2, O2 and Cl2 has to be calculated.
Concept Introduction:
- An ideal gas has is a hypothetical gas that is formed by a few molecules so that, its density is low, and the intermolecular forces are null. The model of gas facilitates mathematical calculations to study gases.
- The
ideal gas law can be expressed in the following way,
Where P is the gas pressure (atm), V is the gas volume (L), T is the gas absolute temperature (K), n is the moles number of the gas and R is the ideal gas constant (
- The ideal gas mixture is a mixture of two or more ideal gases that has the following characteristics,
- Each component of the mixture behaves as ideal gas that occupies all the mixture volume at the mixture temperature.
- Each component exercises a partial pressure. The sum of the partial pressure of the components is equal to the total pressure of the mixture.
- The mole fraction is the ratio between the moles number of the component in the mixture and the total number of moles of gas in the mixture. It can be expressed in the following way,
Where, yi is the molar fraction of component i, ni is the moles number of component i and n total is the total moles number of the mixture.
- The partial pressure is the pressure that a gas of the mixture exercises if it occupies all the volume of the mixture.
- The partial pressure of each component in the mixture is directly proportional to its molar fraction. It can be expressed in the following way,
Where, Pi is the partial pressure of component i, Ptotal is the total pressure of the mixture and yi is the molar fraction of component i.

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Chapter 5 Solutions
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