Only 3 statements are correct. A.) Water is a compound and exist as molecules at rtp. B.) Magnesium chloride is a molecule but not a compound. C.) At rtp, nitrogen exist as diatomic molecules. D.) Rubidium Oxide is a compound but not considered a molecule. E.) Oxygen gas is classified as a compound as it is composed of molecules at rtp. pick out 3 correct statements. i pick A, C and E. am i correct? what's the different between compound and molecule? thanks lotsa.