Calculate the mass percentage of oxygen present in the following compounds and state the law of chemical combination associated. Given, H = 1, O = 16. (i) Water (H2O) and (ii) Hydrogen peroxide (H2O2)



According to Law of multiple proportions

(i) H2O, % of O =ย  16/18 x 100 = 88.89%

(ii) H2O2, % of O = 32/34 x 100 = 94.12%

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