How many grams of H2 gas would be produced by the complete reaction of the aluminum block?

Sulfuric acid can dissolve aluminum metal according to the following reaction…

2Al(s)+3H2SO4(aq)–>Al2(SO4)3(aq)+3H2(g)

Suppose you wanted to dissolve an aluminum block with a mass of 26.9g

1 Answer

  • Convert the mass of Aluminum to moles:

    (26.9 g) X (1/26.98) = .997 mol Al

    Molar ratio:

    (.997 mol) X (3 mol H2/2 mol Al) = 1.4955 mol H2

    Convert the moles of H2 to grams:

    (1.4955 mol H2) X (2.016 g H2/ 1 mole H2) = 3.01 g H2

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