If benzoic acid has a Rf value of 0.3 and a mixture of three "unknown" compounds shows "spots" with Rf values of 0.2, 0.3, and 0.6, which statement is most likely true? Group of answer choices one cannot determine Rf values for compounds in a mixture there are three different forms of benzoic acid in the mixture one of the compounds in the mixture could be benzoic acid and the other two are different compounds