Question

5. How many atoms are found in a 15.5 g sample of bismuth (Bi)? See periodic

table for the molar mass of bismuth. Use dimensional analysis, show all work to
receive full credit. (5 pts)
a. 9.33 × 1024 atoms
b.
3.24 × 10³ atoms
1.26 x 1022 atoms
d. 4.46 × 1022 atoms
C.

Answer 1

Answer - In a 15.5g sample of Bismuth there are 4.46 x 10 22 atoms are present

Explanation - You have to find the number of moles that are in this element first

Number of moles = 15.5g / 209
= 0.074 mole

1 mole = 6.023 x 10 23 atoms as this is Avogadro’s number