Calculate the mass of zinc to be dissolved in excess hydrochloric acid to obtain 56 liters of hydrogen.
April 19, 2021 | education
| Zinc metal reacts with hydrochloric (hydrochloric) acid to release hydrogen gas and form zinc chloride. The reaction is described by the following equation:
Zn + 2HCl = ZnCl2 + H2;
1 mole of metal reacts with 2 moles of acid. This synthesizes 1 mol of salt and 1 mol of hydrogen.
Let’s calculate the synthesized amount of hydrogen. To do this, we divide its volume by the volume of 1 mole of ideal gas, which is 22.4 liters.
N H2 = 56 / 22.4 = 2.5 mol;
To get this amount of hydrogen, you need 2.5 mol of metal. Let’s calculate its weight.
M Zn = 65 grams / mol;
m Zn = 2.5 x 65 = 162.5 grams;
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