“na2so3” represents sodium sulfite. what does the 4 mean in the formula 4na2so3?

The mass of substance which consists the equal number of particles as 12 grams of Carbon-12 is said to be mole.

For example:

The balanced chemical equation for production of water from hydrogen and oxygen is:

That means 2 moles of reacts with 1 mole of to give 2 moles of  .

The given formula is .

Hence, 4 represents the number of moles in formula that is 4 moles of .

The number of atoms of sodium, in is:

The number of atoms of sulfur, in is:

The number of atoms of oxygen in, in is:

a chemical reaction

explanation:

yes

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