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If you are given 46 grams of magnesium how many grams of hyfrogen will be produced?

  • Chemistry -

    You did not say what the Mg was reacting with. I will assume water
    atomic mass H = 1 so H2 is 2
    atomic mass Mg = 24
    Mg (s) + 2H2O(g) -> Mg(OH)2(aq) + H2(g)
    for every 2 grams of H2 you need 24 grams of Mg

    Mass H2/Mass Mg = 2/24 = 1/12
    46 * 1/12 = 3.8

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