Question

2Al2O3 → 4Al + 302

Answer 1

540g

Explanation:

Given parameters:

Mass of the aluminium oxide = 1020g

Unknown:

Mass of aluminium = ?

Solution:

To find the mass of the aluminium formed from this reaction, we work from the known to the unknown. The known here is the mass of the aluminium oxide.

Using this mass, find the number of moles in the aluminium and relate it using the balanced equation to that of the unknown aluminium.

From the number of moles, we can easily find the mass of the aluminium.

Solving:

    Balanced equation:

                 2Al₂O₃ → 4Al + 3O₂

Number of moles of Al₂O₃ = $\frac{mass}{molar mass}$

   Molar mass of Al₂O₃  = 2(27) + 3(16) = 102g/mol

    Number of moles =  $\frac{1020}{102}$ = 10mol

From the balanced equation:

        2 moles of  Al₂O₃ produced 4 moles of Al

        10 moles of Al will produce    $\frac{4 x 10}{2}$ = 20moles of Al

Mass of Al = number of moles of Al x molar mass of Al = 20  x 27 = 540g

Learn more:

Number of moles brainly.com/question/13064292

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