Guys I need help with this I don't really understand it

If 90.0 grams of ethane reacted with excess chlorine, how many grams of dicarbon hexachloride would form

What is the mass of phosphorous in a 51-kg person

An experiment is conducted to see if cats preferred skim milk or 2% milk. a cup of skim milkwas put out for 5 kittens and then measured how much the kittens drank over the course of aday. following a cup of 2% milk was purout for the skittens and then masured how much thekittens drank over the course of a day. the same kittens were used and the milk was served atthe same temperature. it was discovered that the cats liked the 2% milk more than the skimmilk. what is the dependent variable in this experiment?