Which of these elements is most likely to be a colorless gas based on the type of element? Al, Pd, Ar, Cs

How do you find a theoretical mass? is there a difference between theoretical mass and theoretical yield?

If a plot weight (in g) vs. volume (in ml) for a metal gave the equation y= 13.41x and r^2=0.9981 what is the density of the metal?

Draw the skeletal structures of two different molecules that are each made of 5 carbon atoms and 12 hydrogen atoms.