Zn + HCl --> ZnCl2 + H2
If 18 grams of Zn are used in the following reaction, how many grams of H2 will be produced?

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  1. first let's see if the chemical equation is balanced.
    Zn + HCl --> ZnCl2 + H2
    since not yet balanced, then we balance it :P
    Zn + 2HCl --> ZnCl2 + H2
    since we are given grams of Zinc, we need to find the mass of Zn from periodic table to convert it to moles. thus
    Zn = 65.4 g/mol
    also since we are required to find grams of H2, we look also for the mass of H:
    H = 1 , thus
    H2 = 1*2 = 2 g/mol
    18 g Zn * (1 mol Zn / 65.4 g Zn) * (1 mol H2 / 1 mol Zn) * (2 g H2 / 1 mol H2) = 0.55 g H2

    hope this helps~ :)

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