Asample of an ore of iron, hematite, is 79% fe2o3. how much iron is there in 4 kilograms of the ore? answer in units of g.

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the major pests we deal with are insects, weeds and fungal diseases. a pesticide is a product, whether organic or chemical, used to kill the target pest. there are other techniques gardeners should use that can prevent the severe infestations that make the use of pesticides necessary