Interpretation: The mass percentage of oxygen and the mass of the second element in the compound in the given table needs to be calculated to complete the table.
Concept Introduction: For any given compound, if the mass of the compound is known and the mass of an element (A) is known, its percentage can be calculated as follows:
Here,
To calculate the mass of the second element in the compound, the percentage of the second element can be calculated first, and then using the mass of a compound, the mass of the second element can be estimated.
The following formula can be used to calculate the mass percentage of oxygen from the mass of the compound and the mass of oxygen given:
To calculate the mass of the second element, the mass percentage of the second element needs to be calculated first.
In case 1, the second element is Cu. Its mass percentage will be:
The mass of Cu can be calculated as follows:
Compound | Mass of compound (g) | Mass of oxygen (g) | Mass % of oxygen | Mass % of second element | Mass of second element in the compound (g) |
80.0 | 16 | ||||
18.0 | 16 | ||||
34.0 | 32 | ||||
28.0 | 16 | ||||
44.0 | 32 |
Chapter 3 Solutions
Glencoe Chemistry: Matter and Change, Student Edition
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