PLS HELP ASAP this student's experiment had an additional variable that made the conclusion unreliable. What was the additional variable, and how did it affect the experiment? Hint there are 16 tablespoons in a cup, so one tablespoon is 6.25 percent of one cup

4. propanol and isopropanol are isomers. this means that they have a) the same molecular formula but different chemical properties. b) different molecular formulas but the same chemical properties. c) the same molecular formula and the same chemical properties. d) the same molecular formula but represent different states of the compound