The answer is motion, this is what I would go with because when you are dealing with gases it puts motion in the term of particles.
The idea is that all continents move at a rate of approximately 2 inches per year because their moving ever since pangea (all continents were one) separated
Na has a +1 charge, and O has a -1 charge.
Answer: The molar mass of the given compound is 
Explanation:
In molecular formula of
there are two chlorine atoms and one calcium atom.
The atomic mass of the calcium = 40.07 g/mol
The atomic mass of chlorine = 35.5 g/mol
Molar mass of the guven compound is :

The molar mass of the given compound is 
Answer:
Ethane & propane are members of same homologous series : alkane which is indicated with Cn H2n+2
Explanation: