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The white pigment used in oil paintings will turn into a black

From the chemical equation of the reaction ? 0 1

S atom? 0 1

O atom? 8 8

H atom? 8 8

Based on chemical changes before and after As long as the type and number of atoms remain unchanged, it can be judged that the molecule of reactant X is composed of 1 Pb atom and 1 S atom, then the chemical formula of substance