
Concept explainers
(a)
Interpretation:
The total pressure of the gases in the system is to be determined.
Concept Introduction :
According to Dalton’s law of partial pressure of gases, the sum of the partial pressure of the individual gases is equal to the total pressure of the system.
(a)

Answer to Problem 68A
The total pressure is
Explanation of Solution
The entire pressure of the system is equal to the sum of partial pressures of different gases.
The entire pressure is given as,
(b)
Interpretation:
The gas which contains a greater number of moles is to be explained.
Concept Introduction:
According to the ideal gas equation, the pressure of the gas is directly proportional to the number of moles of the gas.
(b)

Answer to Problem 68A
Oxygen gas contains the greatest number of molecules.
Explanation of Solution
The number of moles is calculated as;
In the above expression, we take the volume of the gas is 1L
So,
Here, the value of gas constant and temperature is the same for all gases. Therefore, the number of moles is directly based on the pressure of the gas. So, out of the given pressures of different gases, the pressure of oxygen gas is maximum. So, oxygen gas contains the greatest number of moles.
Chapter 13 Solutions
World of Chemistry, 3rd edition
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