1) A laboratory test of 14.3 grams of iron ore yields 8.20 grams of iron. If the iron compound in the ore is Fe3O4 and it is converted to pure metal by the reaction Fe3O4(s) + 2 C(s) 3 Fe(s) + 2 CO2(g), what is the percentage of Fe3O4 in the ore?
1) A laboratory test of 14.3 grams of iron ore yields 8.20 grams of iron. If the iron compound in the ore is Fe3O4 and it is converted to pure metal by the reaction
Fe3O4(s) + 2 C(s) 3 Fe(s) + 2 CO2(g),
what is the percentage of Fe3O4 in the ore?
2) A student was given a 3.708-g sample of a mixture of potassium nitrate and potassium bromide and was asked to find the percentage of each compound in the mixture. He dissolved the sample and added a solution that contained an excess of silver nitrate, AgNO3. The silver ion precipitated all of the bromide ion in the mixture as AgBr. It was filtered, dried, and weighed. Its mass was 2.957 g.
What was the percentage of each compound in the mixture?
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