According to Law of multiple proportions
(i) H2O, % of O = 16/18 x 100 = 88.89%
(ii) H2O2, % of O = 32/34 x 100 = 94.12%
Question
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)
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Open Answer »A colorless liquid is thought to be a pure compound. Analysis of three samples of the material yield the following results.
| Mass of Sample | Mass of carbon | Mass of Hydrogen | |
| Sample 1 | 1.0 g | 0.862 g | 0.138 g |
| Sample 2 | 1.549 g | 1.335 g | 0.214 g |
| Sample 3 | 0.988 g | 0.852 g | 0.136 g |