A gold bar is 5.50 cm long, 3.10 cm wide, and 0.300 cm thick. (7.1, 7.2, 7.3, 7.4, 7.5)a....

A gold bar is 5.50 cm long, 3.10 cm wide, and 0.300 cm thick. (7.1, 7.2, 7.3, 7.4, 7.5)

a. If gold has a density of 19.3 g/cm3, what is the mass of the gold bar?

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b. How many atoms of gold are in the bar?

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c. When the same mass of gold combines with oxygen, the oxide product has a mass of 111 g. How many moles of O are combined with the gold?

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d. What is the molecular formula of the oxide product if it is the same as the empirical formula?