Are the two samples described below of the same compound:
A sample of a certain lead compound contains 6.46 g of lead for each gram of Oxygen. A second sample has a mass of 68.54 g and contains 28.76 g of oxygen.
The first sample has 6.46 g of lead for each gram of oxygen. The atomic weight of lead is 207.2 and that of oxygen is 16. The ratio of `207.2/6.46` and 16 is approximately 2. This gives the chemical formula of the compound as PbO2.
The second sample has a mass of 68.54 g and contains 28.76 grams of oxygen. The mass of lead in the sample is 39.78
If a 68.54 g sample of the compound that constitutes the first sample or PbO2 is taken it would contain 63.62 g of lead and 4.91 g of oxygen.
As this is not the case, the two samples are not of the same compound.