Question: is IC carrier tape a preparation technology of new polymer packaging materials?
Answer: (1) according to the reaction between iron and oxygen to form ferric oxide;
(2) It is considered that the type and number of various atoms remain unchanged before and after the reaction and the chemical properties of nitrogen are stable;

(3) ① separate the mixture according to the fact that iron is insoluble in water and ferrous chloride is soluble in water; ② The mass of iron is calculated according to the mass of hydrogen, and then divided by 20g to calculate the mass fraction of iron

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