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Summary
So far you only learn how to write chemical formula for ONE molecule. How do you describe two molecules? For instance, the chemical formula for two sodium hydroxide molecules is written
as
This means there are two sodium, two oxygen and two hydrogen. This is NOT two sodium, one oxygen and one hydrogen atom.
Below shows the summary of the chemical notation, using aluminium sulfate as an example (this example indicate two aluminium sulfate).
End of lesson
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