Answer : The compound contains the highest percentage of lead (by mass) is, PbS.
Explanation :
To calculate the percentage of lead in sample, we use the equation:
![\%\text{ of lead}=\frac{\text{Mass of lead}}{\text{Mass of sample}}\times 100](https://tex.z-dn.net/?f=%5C%25%5Ctext%7B%20of%20lead%7D%3D%5Cfrac%7B%5Ctext%7BMass%20of%20lead%7D%7D%7B%5Ctext%7BMass%20of%20sample%7D%7D%5Ctimes%20100)
<u>For
:</u>
Mass of
= 239.3 g
Mass of Pb = 207.2 g
Putting values in above equation, we get:
![\%\text{ of lead}=\frac{\text{Mass of lead}}{\text{Mass of sample}}\times 100=\frac{207.2g}{239.3g}\times 100=86.58\%](https://tex.z-dn.net/?f=%5C%25%5Ctext%7B%20of%20lead%7D%3D%5Cfrac%7B%5Ctext%7BMass%20of%20lead%7D%7D%7B%5Ctext%7BMass%20of%20sample%7D%7D%5Ctimes%20100%3D%5Cfrac%7B207.2g%7D%7B239.3g%7D%5Ctimes%20100%3D86.58%5C%25)
The percentage of lead in the
is 86.58 %.
<u>For
:</u>
Mass of
= 267.2 g
Mass of Pb = 207.2 g
Putting values in above equation, we get:
![\%\text{ of lead}=\frac{\text{Mass of lead}}{\text{Mass of sample}}\times 100=\frac{207.2g}{267.2g}\times 100=77.55\%](https://tex.z-dn.net/?f=%5C%25%5Ctext%7B%20of%20lead%7D%3D%5Cfrac%7B%5Ctext%7BMass%20of%20lead%7D%7D%7B%5Ctext%7BMass%20of%20sample%7D%7D%5Ctimes%20100%3D%5Cfrac%7B207.2g%7D%7B267.2g%7D%5Ctimes%20100%3D77.55%5C%25)
The percentage of lead in the
is 77.55 %.
<u>For
:</u>
Mass of
= 259.7 g
Mass of Pb = 207.2 g
Putting values in above equation, we get:
![\%\text{ of lead}=\frac{\text{Mass of lead}}{\text{Mass of sample}}\times 100=\frac{207.2g}{259.7g}\times 100=79.78\%](https://tex.z-dn.net/?f=%5C%25%5Ctext%7B%20of%20lead%7D%3D%5Cfrac%7B%5Ctext%7BMass%20of%20lead%7D%7D%7B%5Ctext%7BMass%20of%20sample%7D%7D%5Ctimes%20100%3D%5Cfrac%7B207.2g%7D%7B259.7g%7D%5Ctimes%20100%3D79.78%5C%25)
The percentage of lead in the
is 79.78 %.
<u>For
:</u>
Mass of
= 545.3 g
Mass of Pb = 207.2 g
Putting values in above equation, we get:
![\%\text{ of lead}=\frac{\text{Mass of lead}}{\text{Mass of sample}}\times 100=\frac{207.2g}{545.3g}\times 100=37.99\%](https://tex.z-dn.net/?f=%5C%25%5Ctext%7B%20of%20lead%7D%3D%5Cfrac%7B%5Ctext%7BMass%20of%20lead%7D%7D%7B%5Ctext%7BMass%20of%20sample%7D%7D%5Ctimes%20100%3D%5Cfrac%7B207.2g%7D%7B545.3g%7D%5Ctimes%20100%3D37.99%5C%25)
The percentage of lead in the
is 37.99 %.
Hence, from this we conclude that, the compound PbS contains the highest percentage of lead (by mass).