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Answer:
6.67 moles
Explanation:
Given that:-
Moles of hydrogen gas produced = 10.0 moles
According the reaction shown below:-
3 moles of hydrogen gas are produced when 2 moles of aluminium undergoes reaction.
Also,
1 mole of hydrogen gas are produced when moles of aluminium undergoes reaction.
So,
10.0 moles of hydrogen gas are produced when moles of aluminium undergoes reaction.
<u>Moles of Al needed = moles = 6.67 moles</u>