A gold bar is 5.50 cm long, 3.10 cm wide, and 0.300 cm thick. a). If gold has a density of 19.3g/cm3, What is the mass of the gold bar? b). How many atoms of gold are in the bar? c). When the same mass of gold combines with oxygen, the oxide product has a mass of 111g. How many moles of O are combined with the gold?. d). What is the molecular formula of the oxide product if it is the same as the empirical formula?

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".