Question #5700149

please help with chem?

50.0 grams of a pure gaseous compound wasfound to contain 24 grams of oxygen. What is the percentage by weight of oxygen in this compound answer in % Chalcopyrite is an ore with the composition CuFeS2. What is the percentage of copper in a 30.1 grams sample of this ore? answer in % Duralin is an alloy of aluminum containing 4.5 percent of manganese, 3.5 percent of copper and 0.45 percent of magnesium. How much manganese is present in a 45 g sample of this alloy? answer in Grams

2013-04-26 13:47:33

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