Butanol is composed of carbon, hydrogen, and oxygen. If 1.0 mol of butanol contains 6.0 x 1024 atoms of hydrogen, what is the subscript for the hydrogen atom in the molecular formula for butanol?

a) 1

b) 10

c) 6

d) 8

Option B. 10

Explanation:

If 1 mol of butanol contains 6*10²⁴ atoms of H, let's calculate the amount of H.

(number of atoms / NA)

6.02 x 10²³ atoms ___ 1 mol

6*10²⁴ atoms will occupy (6*10²⁴ / NA) = 9.96 moles

H, has 10 moles in the butano formula.