I don't know this article, but I do know some major changes: first, the change from the plum pudding model (no nucleus, just electrons) to the gold foil experiment, which had Rutherford shoot alpha particles at a sheet of gold only to find them rebounding, proving the existence of a positively charged mass, i.e a nucleus, in the atom. However, this changed again when Bohr realized that the negatively charged electrons should be attracted to the positively charged center, so that there must be something else inside the nucleus.
Possibly C or D i wanna say sorry if i’m wrong
The molar mass of gas = 238.29 g/mol
<h3>Further explanation</h3>
Given
mass = 81.5 g
P=1.75 atm
V=4.92 L
T=307 K
Required
molar mass
Solution
The gas equation can be written


So the equation becomes :

Input the value :

Hello,
Here is your answer:
The proper answer to this question is that "e<span>ach sub-level electron type has a unique path where it will likely to be found".
If you need anymore help feel free to ask me!
Hope this helps!</span>
Answer:
26.8224 Meters per Second.