Pls answer this question nnnsssb Share with your friends Share 0 Aditi Gupta answered this Solution: In black oxide the percent of Cu = 80 %So percent of O = 20 %If percent of Copper is 1, then percent of oxygen = 2080 = 0.25In red oxide percent of Cu = 89 %So percent of O = 11 %If percent of Copper is 1 then percent of oxygen = 1189 = 0.1235Law of multiple proportion states that if two elements can combine to form more than one compound the mass of one element that combines with the fixed mass of other element are in the ratio of simple whole number.Ratio of oxygen percent = 0.250.1235 ≃ 21Hence, the data is according to law of multiple proportion. 0 View Full Answer