Question

How many atoms are in 11.5 moles of carbon?

Rounded to the appropriate number of Significant Figures. Give answer using scientific notation.

Answer 1

The number of atoms in one mole of any substance is described by Avogadro's number (N_A):

N_A = 6.022 × 10²³ atoms or particles in one mole

From here, the number of atoms in a substance equals:

N = n × N_A

where N - the number of atoms, n - the number of moles, N_A - Avogadro's number.

Therefore, as 1 mole of carbon contains 6.022 × 10²³ atoms, 11.5 moles contain:

N = 11.5 mol × 6.022 × 10²³ = 69.253 × 10²³ = 6.93 × 10²⁴ atoms of carbon

Answer: 6.93 × 10²⁴