# 240 g of metal powder consisting of 35% zinc and 65% copper was poured

June 30, 2021 | education

| **240 g of metal powder consisting of 35% zinc and 65% copper was poured with excess hydrochloric acid. determine the mass of the evolved gas.**

Copper does not interact with hydrochloric acid.

Zinc dissolves in hydrochloric acid, the reaction is described by the following chemical equation:

Zn + 2HCl = ZnCl2 + H2;

Let’s calculate the chemical amount of zinc. To do this, we divide its weight by the molar weight of elemental zinc.

M Zn = 65 grams / mol;

N Zn = 240 x 0.35 / 65 = 1.2923 mol;

The same amount of hydrogen will be released.

Let’s determine its weight.

To this end, we multiply the amount of substance by the weight of 1 mole of hydrogen gas.

M H2 = 2 grams / mol;

m H2 = 2 x 1.2923 = 2.585 grams;

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