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If given: A 1.4470g sample of an oxide of gold was reduced with ethane to 1.2900g of gold metal. What is the simple formula of the original gold oxide?
How many moles of gold is 1.29g? How many moles of O is in (1.447-1.29)g of oxygen?
divide the lower number of moles (gold, or O) into the larger, that is the mole ratio of the elements in the formula.