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Rank the compounds in order from largest mass percent of nitrogen to smallest mass percent of nitrogen. NH4HSO4, NH2CONH2, (NH4)2SO4 part B The most common source of copper (\rm Cu) is the mineral chalcopyrite (\rm CuFeS_2). How many kilograms of chalcopyrite must be mined to obtain 320.g of pure \rm Cu? Express your answer to three significant figures and include the appropriate units.

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