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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Chemistry

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24 April, 22:06

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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Khalil Larsen · Answer 1

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.