The vapor density of a gas may be defined as…
A. the mass of a unit volume of the gas compared to an equal volume of water vapour.
B. the mass of a unit volume of the gas compared to an equal volume of hydrogen.
C. the mass of a unit volume of the gas compared to an equal volume of oxygen.
D. The mass of a unit volume of the gas minus the vapour pressure of water.
The vapor density of any gas is the density of such gas when compared to the density of equal volume of hydrogen at the same temperature and pressure.
Now we know that density = mass/ volume,
we can then redefine vapor density of any gas as the mass of one unit volume of such gas when compared to that of equal volume of hydrogen.
Now for the right answer to the above question:
- Option A is incorrect. water is not the standard in measuring vapor density, as it is not even a gas at room temperature.
- Option B is correct. Hydrogen is the perfect reference frame because it is a gas at room temperature, and has a unit atomic mass of 1g/mol.
- C is incorrect. the atomic number of oxygen is 8, we would ordinarily prefer to use a gas whose atomic number is 1 instead.
- D is not the correct answer.
You may please note these/this:
- Because the atomic mass of hydrogen is 1g, it is often used as a standard reference in most scientific calculations.
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/ culled from 2017 JAMB-UTME Chemistry question 6 /
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