The total pressure of gas is found to be 345 kPa. The partial pressure of oxygen gas is 45% of the mixture. What is the partial pressure of oxygen gas? kPa (just type your numerical answer with 3 sig digs to be counted correct)
Ideal and Real Gases
Ideal gases obey conditions of the general gas laws under all states of pressure and temperature. Ideal gases are also named perfect gases. The attributes of ideal gases are as follows,
Gas Laws
Gas laws describe the ways in which volume, temperature, pressure, and other conditions correlate when matter is in a gaseous state. The very first observations about the physical properties of gases was made by Robert Boyle in 1662. Later discoveries were made by Charles, Gay-Lussac, Avogadro, and others. Eventually, these observations were combined to produce the ideal gas law.
Gaseous State
It is well known that matter exists in different forms in our surroundings. There are five known states of matter, such as solids, gases, liquids, plasma and Bose-Einstein condensate. The last two are known newly in the recent days. Thus, the detailed forms of matter studied are solids, gases and liquids. The best example of a substance that is present in different states is water. It is solid ice, gaseous vapor or steam and liquid water depending on the temperature and pressure conditions. This is due to the difference in the intermolecular forces and distances. The occurrence of three different phases is due to the difference in the two major forces, the force which tends to tightly hold molecules i.e., forces of attraction and the disruptive forces obtained from the thermal energy of molecules.
According to Dalton's law of partial pressure,
The pressure exerted by each gas in a gas mixture (its partial pressure) is independent of the pressure exerted by all other gases present.
The total pressure exerted by a mixture of gases is the sum of the partial pressures of the components .
- The percent of each gas in the total volume is the same as the percent of each partial pressure in the total pressure.
So, from the total pressure of a mixture of gases and its percent composition, we can calculate the partial pressure of the individual gases.
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