Chloroethane is the answer
Is air a compound mixture or a element. compound
It depends on the Chemical the Substance has. The more Chemicals, the better the Substance gets when its mixed with another.
To find the mole of a substance, you take the mass divided by the molar mass of that substance~
Solids are packed together closely, liquids are farther apart but still relatively close, and gases are very far apart with lots of space.