Answer :
Given parameters:
Number of moles of iron = 0.251 moles
Unknown:
Number of atoms = ?
Solution:
A mole of an atom contains the Avogadro's number of particles;
Avogadro's particles = 6.02 x 10²³ atoms
1 mole of atom = 6.02 x 10²³ atoms
0.251 moles = 0.251 x 6.02 x 10²³ = 1.51 x 10²³ atoms
The number of atoms here is 1.51 x 10²³ atoms
The number of atoms in 0.251 mol of Iron sample has been [tex]1.51\;\times\;10^2^3[/tex].
The number of atoms in a mole of sample has been given by the Avogadro law. According to the Avogadro law, the number of atoms in 1 mole of sample has been equivalent to the Avogadro number.
The Avogadro number has been a constant quantity with the value of [tex]6.023\;\times\;10^2^3[/tex].
Computation for Iron atoms
The given mole of iron has been 0.251 mol.
The number of atoms in the sample has been given as:
[tex]\rm 1\;mol=6.023\;\times\;10^2^3\;atoms\\ 0.251\;mol=0.251\;\times\;6.023\;\times\;10^2^3\;atoms\\ 0.251\;mol=1.51\;\times\;10^2^3\;atoms[/tex]
The number of atoms in 0.251 mol of Iron sample has been [tex]1.51\;\times\;10^2^3[/tex].
Learn more about number of atoms, here:
https://brainly.com/question/1152162