## Chemistry and Chemical Reactivity (9th Edition)

After heating, only tin oxide is left in the crucible. Number of moles of tin metal: $(14.710-13.457)\ g\div 118.71\ g/mol=0.01056\ mol$ Number of moles of oxygen atoms: $(15.048-14.710)\ g\div 15.9994\ g/mol=0.02112\ mol$ Ratio: $0.02112/0.01056=2.00$ Empirical formula: $SnO_2$