Ancient egyptians used a variety of lead compounds as white pigments in their cosmetics, including pbs, pbco3, pbcl(oh), and pb2cl2co3. which of these compounds contains the highest percentage of lead (by mass)

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:

For :

Mass of = 239.3 g

Mass of Pb = 207.2 g

Putting values in above equation, we get:

The percentage of lead in the is 86.58 %.

For :

Mass of = 267.2 g

Mass of Pb = 207.2 g

Putting values in above equation, we get:

The percentage of lead in the is 77.55 %.

For :

Mass of = 259.7 g

Mass of Pb = 207.2 g

Putting values in above equation, we get:

The percentage of lead in the is 79.78 %.

For :

Mass of = 545.3 g

Mass of Pb = 207.2 g

Putting values in above equation, we get:

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).

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms