Chapter 3, Problem 97A

Interpretation Introduction

Interpretation:

Whether the two given samples are same or not needs to be determined.

Concept introduction:

Here the masses of lead and oxygen given in the two different sample. To find whether they are same or not, the ratio of the elements constituting them needs to be found.

Answer to Problem 97A

The two samples are not same because the both of their ratios are different.

Explanation of Solution

A particular compound always consists of fixed ratios of all the different elements. As the number of elements that combines to form the compound never changes so the ratio between them should not change. If the ratio changes that means it is a totally different compound.

Mass of lead is $6.46gm$ for each gram of oxygen.

$\frac{mas{s}_{lead}}{mas{s}_{oxygen}}=\frac{6.46gm}{1gm}=6.46$

Mass of lead is found by subtracting the mass of oxygen from the whole mass of the sample.

$\frac{mas{s}_{lead}}{mas{s}_{oxygen}}=\frac{68.54-28.7gm}{28.76gm}=1.383$

Here the two samples are not having the same ratios, so they are not the same compound.

Conclusion

The different ratios of lead to oxygen make them a different compound.