3 molecules element hydrogen gas. 2 hydrogen atoms in each molecule., 4 molecules of the compound calcium chloride. 1 calcium atom and 2 chlorine atoms in the compound.. There is 1 calcium atom and 2 chlorine atoms in the compounds., 1 molecule of the compound water. 2 hydrogen atoms and 1 oxygen atom in the compound. , 1 molecule of compound sodium sulfate. 2 sodium atoms, 1 sulfur atom, and 4 oxygen atoms in the compound. , The symbol for the element iron., 1 molecule of the compound sodium oxide. 2 sodium atoms and 1 oxygen atom in the compound.  ,

Compounds - Counting Atoms

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