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A sample of scandium metal weighing 8.565 g is heated in air and combines with oxygen....

A sample of scandium metal weighing 8.565 g is heated in air and combines with oxygen. The resulting compound weighs 13.137 g. Calculate the following:
a. Mass of oxygen reacted?
b. Moles of scandium atoms?
c. Moles of oxygen atoms?
d. The empirical formula of the compound?

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