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shutvik [7]
3 years ago
5

2Al + 6HCl → 2AlCl3 + 3H2 If the chemical reaction produces 129 grams of AlCl3, how many grams of H2 are also produced?

Chemistry
2 answers:
faust18 [17]3 years ago
5 0

So,

Our conceptual plan is as follows:

g AlCl3 --> mol AlCl3 --> mol H2 --> g H2

\frac{129g\ AlCl_3}{133.4g/mol}\ *\frac{3mol\ H_2}{2mol\ AlCl_3}\ *2.016g/mol \\ \\=2.92 g\ H_2

Hope this helps!

pav-90 [236]3 years ago
5 0

Answer:

B. 2.92

Explanation:

  • It is a stichiometry problem.
  • From the balanced given reaction: 2Al + 6HCl → 2AlCl₃ + 3H₂,
  • It is clear that 2.o moles of Al reacts with 6.0 moles of HCl to produce 2.0 moles of AlCl₃ and 3.0 moles of H₂.
  • Herein, we are concerned with the two products that the reaction results <em>2.0 moles of AlCl₃ with 2.0 moles of H₂.</em>
  • So, we should convert the amount of grams of AlCl₃ (129.0 g) to number of moles (n) using the relation:

<em>n = mass / molar mass,</em>

∴ n of AlCl₃ = (129.0 g) / (133.34 g/mol) = 0.967 mol.

<em><u>Using cross multiplication:</u></em>

2.0 moles of AlCl₃ produced with → 3.0 moles of H₂, from the stichiometry.

0.967 moles of AlCl₃ produced with → ??? moles of H₂.

∴ the number of moles of H₂ = (0.967)(3.0) / (2.0) = 1.45 mol.

  • Now, we can get the grams of H₂:

∴ The grams of H₂ = n x molar mass = (1.45 mol)(2.01588 g/mol) = 2.92 g.

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