Answer:
1 mole
Step-by-step explanation:
Given parameters:
number of moles of H₂O = 6moles
Number of moles of Al used up= 4 moles
Number of moles of Al given = 5 moles
Unknown:
Number of moles of Al left unreacted = ?
Solution
To solve this problem, we are going to use the mole approach. The balanced chemical equation furnishes us with an overview of the amount of reactants used in the reaction.
The balanced equation is shown below:
2Al + 3H₂O → Al₂O₃ + 3H₂
we can also see that 4 moles of aluminium was used up in the reaction.
The amount of unreacted aluminum = Number of moles given - number of moles used
= 5 mole - 4 mole
= 1 mole