2H2+O2-->2H2O, If you have 9 moles of Hydrogen gas (H2), how many moles of water can you form? (Enter just the number: not the number and units)

If you have 9 moles of hydrogen gas (H2) the moles of water that can be formed is 9 moles

calculation

2H2 + O2→ 2H2O

The mole of H2O is calculated using the mole ratio.

that is H2:H2O is 2:2 into simple form = 1:1

therefore if 9 moles of H2 reacted the moles of H2O = 9 x1/1 = 9 moles