# What is the number of moles of aluminum in 54 g of Al?

Nov 10, 2016

2 moles

#### Explanation:

Aluminum $A {l}_{13}^{27}$ 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

$\frac{\frac{54}{1}}{\frac{27}{1}}$ = 2 moles