Write the simplest formula for each of the following compounds: 0.080 mole Ba, 0.080 mole S, 0.320 mole O?

Question

If 12 moles of Al2O3 are produced, how many moles of aluminum reacted?

Write a balanced equation for the reaction of the magnesium and the oxygen.

Answer 1

divide each of the moles by the smallest (0.08) to get
Ba =1
S = 1
O = 4
so we get BaSO4
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4Al + 3O2 -> 2Al2O3

so 12 mole of Al2O3 come from 24 mol of Al
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2Mg + O2 -> 2MgO

Answer 2

BaSO4

24 moles of Al

2Mg(s) + O2(g) > 2MgO(s)