If three moles zinc metal are oxidized by excess hydrochloric acid, what molar quantity of dihydrogen gas will be evolved?

1 Answer
Feb 22, 2017

Answer:

#"Three moles of dihydrogen gas will be evolved. "#

Explanation:

We need a stoichiometric equation that represents the oxidation of zinc metal by an acid:

#Zn(s) + 2HCl(aq) rarr ZnCl_2(aq) + H_2(g)uarr#

Given the stoichiometry, if #3.0*mol# zinc metal react, then, given the stoichiometry of the reaction, #"3 mol dihydrogen gas"# will be evolved. All I am doing is following the stoichiometry of the balanced equation. Do you agree?

What does #"stoichiometric"# mean?