The answer is 5.1 moles of Hydrogen gas will be produced when 3.4 moles of aluminum reacts with excess water.
What is a mole ?
A mole is defined as 6.02214076 × 10²³ atoms, molecules, ions, or other chemical units.
In this reaction
2Al(s) + 6H₂O(g) → 2Al(OH)₃(s) + 3H₂(g)
2 moles of Aluminium produces , 3 moles of Hydrogen gas
so for this question if 3.4 moles is present with excess of water
[tex]\rm\dfrac{3.4\;\times3}{2} \; moles \; of \; Hydrogen\; gas\; will\; be\; produced[/tex]
= 5.1 moles of H₂(g)
Therefore 3.4 moles of aluminum with excess water reacts and produces 5.1 moles of hydrogen gas .
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