Question

Given 12 g of aluminum, how many moles do you have?

Answer 1

Answer:

$0.168631 \ moles \ Al$

Explanation:

Atomic mass of $Al$ is given as $26.982u$, where $u$ is the unified atomic mass unit.

$u$ is defined as $\frac{1}{12}$th the mass of a neutral carbon-12 atom. This is equal to the mass of $one \ nucleon$. Therefore:-

$1u=1g/mol$

Mole constant=$6.022\times10^{23}$ atoms of any element.

For $Al$ of 12g:-

$12\times \frac{1 \ mole \ Al}{26.982g}\\=0.168631 \ moles$$=12\times\frac{1 \ mole \ Al}{26.982g}\\=0.168631 \ moles \ Al$