How many moles of hydrogen molecules (h2) are present in 9 x 1023 molecules of hydrogen?

1,5 moles of H₂

Explanation:

Avogadro's number is defined as a constant that relates the number of particles presents in 1 mole. This number is 6,022x10²³.

Thus, 9x10²³ molecules of hydrogen are:

9x10²³ molecules of hydrogen × (1 mole / 6,022x10²³molecules) =

1,5 moles of H₂

I hope it helps!

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a corroding iron, if that's one of your choices