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8.10 g metal combines with 7.20g of oxygen to form X2O3. What is the relativ

e mass of X

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4X + 3O2 ==> 2X2O3
mols O2 = 7.2/32 = about 0.225
mols X = 0.225 x 4/3 = about o.9
mols X = grams/molar mass. You know g and mols, solve for molar mass

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