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What is the chemical formula of aluminum oxide by a reaction of Al and oxygen gas?
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2 Answers
- 1 decade ago
Al + O2 --> ?
This is a combination reaction of metal and nonmetal. The product will be an ionic compound. To write the structure of the product, first write the ions of metal (Al is in 3rd group, so it forms 3+ ion) and nonmetal (O belongs to 6th group, so it forms 8-6= 2, -2 ion).
Al^3+ O^2- (criss-cross the charges as subscripts) --> Al2O3. This is the formula of the product.
Al(s) + O2(g) --> Al2O3(s)
Balance the equation finally.
4 Al(s) + 3 O2(g) --> 2 Al2O3(s)
