Answer :
The mass in grams of al produced if 100 grams of al2o3 is heated at high temperature is 188.95 g
The molar mass of a substance is the mass in grams of one mole of the compound. In a substance, the quantity of entities gift e.g. atoms, molecules, ions, is described as a mole. A mole of any substance is 6.022×1023 molecules.
Aluminum burns in oxygen according to the following equation:-
4Al + 3O₂ ----------> 2Al₂O₃
This means that the mole ratio of aluminum burnt to that of alumina produced is 4:2 or 2:1.
Recall that: mole = mass/molar mass
mole of 100 g aluminum = 100/26.98
= 3.71 moles
Thus, a mole of alumina produced = 3.71 /2
= 1.85 moles
Mass of alumina produced = mole x molar mass
= 1.85 x 101.96
= 188.95 g
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