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1. When 2.50 g of copper metal reacts with molecular oxygen, the copper oxide product of the reaction has a mass of...

1. When 2.50 g of copper metal reacts with molecular oxygen, the copper oxide product of the reaction has a mass of 2.81 g. What is the empirical formula of the copper oxide product

 2. When 10.8 g of silver was reacted with sulfur. 12.4 grams of product was produced there was only one product). What is the empirical formula of the product? 

3. Lysine is a compound composed of carbon, hydrogen, nitrogen and oxygen. When 1.50 g of lysine is burned, 2.72 g of carbon dioxide, 1.29 g of water and 0.287 g of nitrogen gas are produced. What is the empirical formula of lysine? If the molar mass of lysine is 146.19 g/mol, what is the molecular formula?

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