Classify as to type of reaction
•2Al(OH)3(s) g Al2O3(s) + 3H2O(g)
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•Fe2S3(s) g 2Fe(s)  + 3S(s)
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•Na2CO3(aq) + BaCl2(aq) g BaCO3(s) + NaCl(aq)
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•C(s) + O2(g) g CO2(g)
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