Find the mass of zinc necessary to obtain 6 mol of hydrogen by interaction with hydrochloric acid.

univerkov | April 1, 2021 | education

First, we compose the reaction equation for this problem.
Zn + 2HCl = ZnCl2 + H2.
Next, we make up the proportion.
x mol Zn – 6 mol H2.
1 mol Zn – 1 mol H2.
Find the unknown x.
x = 1 × 6 ÷ 1 = 6 mol.
That is, the amount of zinc substance is 6 mol.
Next, we find the mass of zinc using the following formula.
n = m / M.
We express m.
m = n × M.
Find the mass of zinc.
M (Zn) = 65.4 g / mol.
m (Zn) = 6 mol × 65.4 g / mol = 392.4 g.
That is, the mass of zinc is 392.4 g.
Answer: m (Zn) = 392.4 g.

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