If 1.858 moles of Fe2O3 are produced, how many grams of Fe(OH) 3 were reacted?

What is the chemical formula of the following compound

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

Naoki's bicycle has a mass of 10 kg. if naoki sits on her bicycle and starts pedaling with a force of 168 n, causing an acceleration of 2.8 m/s2, what is naoki's mass?