Determine the percentage of zinc in the alloy if 3.2 liters of hydrogen were released during the interaction of 8g of the alloy with HCl.

The interaction of zinc with hydrochloric acid leads to the formation of zinc chloride:
Zn + 2HCl → ZnCl2 + H2;
Based on the coefficients of the equation, the amount of synthesized hydrogen is equal to the amount of reacted zinc.
N H2 = 3.2 / 22.4 = 0.143 mol;
To obtain this amount of hydrogen, 0.143 mol of zinc must be dissolved.
Let’s calculate its weight.
M Zn = 65 grams / mol;
m Zn = 65 x 0.143 = 9.295 grams