In what respect will two dry samples of nitrogen gas differ from each other if sample 1 is prepared by completely removing CO₂ and O₂ from air, and sample 2 is prepared by passing purified nitrogen(i)oxide over heated copper? sample 1 is

Noxus

1 year ago

The correct answer is B. slightly denser than sample 2.

Here's a breakdown of why:

Sample 1 (from air):
Air contains trace amounts of noble gases, primarily argon. Even after removing CO₂ and O₂, argon will still be present.
Argon has a higher molar mass than nitrogen (Ar: ~40 g/mol, N₂: ~28 g/mol).
Sample 2 (from N₂O and Cu):
The reaction of nitrogen(I) oxide (N₂O) with heated copper (Cu) produces pure nitrogen gas (N₂) and copper(II) oxide (CuO).
N₂O + Cu → CuO + N₂
This method produces very pure nitrogen.
Density Difference:
Because Sample 1 contains trace argon, its average molar mass will be slightly higher than that of pure nitrogen in Sample 2.
Since density is directly proportional to molar mass, Sample 1 will be slightly denser than Sample 2.
Other Options:
A: Sample 2 is actually purer, as it's produced by a specific chemical reaction.
C: They are not the same because of the density difference.
D: Both samples of Nitrogen are colourless.
E: Nitrogen's reactivity is generally low, and the slight impurities won't significantly affect it.