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Module 2: Characteristics of Gases - Ideal Gas Law - Answers

Q icon #1
Do gases A, B, and C have the same or different volumes?

Figure 1

A icon
Answer: Gases A, B, and C have the same volume of 423.4 ft3.

Solution:
This problem illustrates the point that a mole of any ideal gas occupies the same volume at the same conditions of temperature and pressure. This is evident from the ideal gas law equation:

practice equation 1(b)

Where:
V = Volume
n = Number of moles
R = Universal gas constant
T = Absolute temperature
P = Absolute pressure
Mass does not affect the volume of an ideal gas. Under identical conditions of temperature and pressure, gas volume is a function of the number of moles (i.e. number of molecules present). Gases A, B, and C have the same number of moles; therefore, they have the same number of molecules (6.02 1023 molecules per gram mole).

Each gas has the following volume:

practice equation 1(c)

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