How many moles of lead (pb) atoms are in 354 g pb?
select one:
a. 9.72 × 10-25 mol
b. 0.585 mol
c. 1.71 mol
d. 3.52 × 1023 mol

For the answer to the question above asking how many moles of lead atoms are in 354g Pb.
The answer is the third one among the given choices which is c. 1.71mol. Start what you have and apply what you know: 
354g Pb *1molPb/207g Pb =1.71 mol Pb

Density= mass/volume so 5.1 divided by 4.7 is  5.1 / 4.7 =1.08510638298round to the correct number of sig figs

Atp, shorthand for adenosine triphosphate, is the standard molecule for cellular enger in the human body. all motion and metabolic  processes  within the body begins with energy that is released from  atp, as its phosphate bonds are broken in cells through a  process  called hydrolysis.