Question

Aluminum oxide is decomposed using electricity to produce aluminum metal. How many grams of aluminum metal can be produced from 100.0 g of Al2O3?

2Al sub 2 O sub 3, reaction arrow, 4Al + 3O sub 2.

Answer 1

Answer on Question #52446 – Chemistry – Inorganic Chemistry

Question:

Aluminum oxide is decomposed using electricity to produce aluminum metal. How many grams of aluminum metal can be produced from 100.0 g of Al₂O₃?

$$2 \mathrm{Al_2O_3} = 4 \mathrm{Al} + 3 \mathrm{O_2}$$

Answer:

First of all we have to find the amount of mol of $\mathrm{Al_2O_3}$ which was decomposed in the reaction.

We can find number of moles in a given mass by:

$$n = \frac{\text{given mass}}{\text{Molecular Mass}}$$

So, in our case $n = \frac{100}{102} = 0.9804$ mol

It is visible from the chemical reaction that from 2 mol of $\mathrm{Al_2O_3}$ we can obtain 4 mol of Al, so from 0.9804 mol of $\mathrm{Al_2O_3}$ we will obtain 1.9608 mol of Al.

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