Respuesta :

Answer:

2.11 X10^24 atoms

Explanation:

the number of atoms in 3.50 mole of hydrogen

1 mole contains Avogadros number of 6.022 X10^23 atoms

so

3.5 moles contain 3.5 X 6.022 X 10^23

2.11 X10^24 atoms

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