You need 2.5 moles of aluminum for an experiment. How many atoms of aluminum is this?

1 Answer
Nov 15, 2015

Answer:

#2.5 xx N_A#, where #N_A# is Avogadro's number, #6.02214 xx 10^23#.

Explanation:

#N_A# is simply a number, admittedly a very large number. When I have such a number of any element/molecule I have an equivalent mass, and an equivalent number of atoms or molecules. When I have such a number of #Al# atoms, I have a mass of #26.98# #g# of #Al#. You have two and a half times this number of #Al# atoms. What is the mass of your aluminum??