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In experiment on the effect of heating o...

In experiment on the effect of heating on oxides of lead in a current of hydrogen the following results were obtained. Show that they are in agreement with the law of multiple proportions.
a. `1.393 g` of litharge `(PbO)` gave `1.293 g` of lead
b. `2.173 g` of lead peroxide `(PbO_(2))` gave `1.882 g` of lead
c. `1.712 g` of red lead `(Pb_(3) O_(4))` gave `1.552 g` of lead

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