0.5 mol CCl4 is introduced into a 10.0L flask .what fraction of the total volume of flask is occupied by CCl4 molecules?

Answer 1

all of it if it's a gas.
If a liquid, then you need to look up the density of CCl4 (convert to g/L)
find how many grams is .5 mol
volume = mass/density
divide that by 10.0L