Question

Calculate the number of atoms in 54.0 g of aluminum.

Answer 1

Answer:

Aluminum

A

l

27

13

has an atomic molar mass of 27 grams per mole.

Al has 13 protons (hence number 13) and it most common isotope 14 neutrons for a total mass of 27 amu. ( The 13 electrons add no measurable mass to the atom)

Take the grams and divide by the molar mass

54

1

27

1

= 2 moles