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NaOH is one molecule (sodium hydroxide). The coefficient (20) is telling you that there are 20 molecules of NaOH. Sodium hydroxide is composed of one sodium atom (Na), one oxygen atom (O), and one hydrogen (H) atom. If one molecule has three atoms, then 20 molecules will have 60 atoms total.

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14y ago
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Wiki User

12y ago

Note that there are symbols of two different atoms present and that neither has an explicit subscript. This means that there are two atoms in a formula unit of NaCl.

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Gloria Thompson

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4y ago

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Q: How do you determine the number of atoms in 20NaOH?
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