What is the amount of a solute (in mol) needed to make 0.250 L of an NaF solution with a concentration of 1.25 M?

Not a  mixture of two common elements that can be separated by physical means.

Answer    "a salt" would be the best answerexplanationsalts can be defined as ionic compounds that are neither acids nor bases. nacl is an example of a salt, and its ionic.an enzyme is an organic compound which is covalently bonded, not ionically bonded.acids are generally held together by covalent bondsan element does not need any bonds to exist