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Solid aluminum and gaseous oxygen react in a combination reaction to produce aluminum oxide: 4Al (s) + 3O2 (g) →→ 2Al2O3 (s) The maximum amount of Al2O3 that can be produced from 2.5 g of Al and 2.5 g of O2 is ________ g.

Solid aluminum and gaseous oxygen react in a combination reaction to produce aluminum oxide:

4Al (s) + 3O2 (g) 2Al2O3 (s)

The maximum amount of Al2O3 that can be produced from 2.5 g of Al and 2.5 g of O2 is ________ g.

A)5.3
B)7.4
C)4.7
D)9.4
E)5.0

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2 answers

  1. 7.4

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  2. 4 moles Al to 3 moles O2

    molar masses ... Al - 27 g ... O2 - 32 g

    moles Al ... 2.5 / 27 ... 0.093 ... dividing by 4 = .023
    moles O2 ... 2.5 / 32 ... 0.078 ... dividing by 3 = .026

    Al is the limiting reactant ... 0.069 moles of O2 are consumed ... 3 * .023
    ... 32 g * .069 = ? ... added to 2.5 g of Al

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