Question

Hydrogen is generated by passing hot steam over iron, which oxidizes to form Fe3O4, in the following equation:
a. if 625 g of Fe3O4 is produced in the reaction, how many moles of hydrogen are produced at the same time?
b. how many moles of iron would be needed to generate 27 g of hydrogen?
Just follow the stoichiometry example I gave you earlier.
I don't have answer
Someone post the awnser?

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