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14 April, 00:38

If 78.4 grams of aluminum metal react with excess hydrochloric acid, how many grams of hydrogen gas can be produced?2al + 6hcl yields 2alcl3 + 3h2

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  1. 14 April, 03:34
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    Answer is: 8,7g.

    Chemical reaction: 2Al + 6HCl → 2AlCl₃ + 3H₂.

    m (Al) = 78,4g.

    n (Al) = m (Al) : M (Al) = 78,4g : 27g/mol = 2,9 mol.

    n - amount of substance.

    from reaction: n (Al) : n (H₂) = 2 : 3.

    2,9mol : n (H₂) = 2 : 3.

    n (H₂) = 4,35 mol.

    m (H₂) = n (H₂) ·M (H₂) = 4,35mol · 2g/mol = 8,7g.
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