Question

How many atoms are there in 8.97 grams of lead (Pb)

A. 1.12 x 10^27
B. 0.0433
C. 5.40 x 10^24
D. 2.61 x 10^22

Answer 1

Answer:D. 2.61 x 10^22

Step-by-step explanation:

Given that mass of Lead(Pb) = 8.97g

Molar mass of lead =207.2g/mol

No of moles = Mass / molar mass

=8.97g/207.2g/mol

= 0.04329moles

Converting to atoms using Avogadro's number

we know that

1 mole = 6.022 x 1023 atom

Therefore 0.04329 moles of Pb = 0.04329moles x 6.022 x 10^23 atoms

=2.6069 x 10^22

=2.61 x10^22atoms