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Luca Taccagni · Answer 1 · 2021-01-21T15:27:33+0000

Answer:

There are 20 atoms in hydrogen.

Step-by-step explanation:

Multiply Coefficient with Hydrogens subscript. In this case the coefficient is a 4 so you multiply that with Hydrogens subscript which is 5. So it would be (4)(5)=20

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