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The "4" means that there are 4 water (H2O) molecules. The subscript of 2 on hydrogen means that there are two Hydrogens per molecule of water, so there are 8 hydrogens and 4 oxygens in all, since Oxygen has a subscript of 1.

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How many atoms in 4 Na2Co3?

There are a total of 28 atoms in 4 molecules of Na2CO3. This is calculated by multiplying the number of atoms of each element present in one molecule by the total number of molecules. Each Na2CO3 molecule has 2 sodium atoms, 1 carbon atom, and 3 oxygen atoms, adding up to 28 atoms in 4 molecules.


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This number is 50 atoms.


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