There are 2.6 moles HCl are needed to react with 0.87 mol of Al.
The mole would be an equivalent to Avogadro's number in terms of chemistry units.
HCl is a mixture of hydrogen and chlorine .
The reaction between the HCl and Al is shown as:
Al + HCl → AlCl3 + H2
By balancing the above equation.
2Al + 6HCl → 2AlCl3 + H2
It can be seen that there are 2 mole Al will be reacted with 6 mole of HCl hence, 0.87 mole Al will be react with 2.6 mole of HCl.
Therefore, there are 2.6 moles HCl are needed to react with 0.87 mol of Al.
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