how many particles would be found in a 2.1 mol sample of alpo₄?

Explanation:

Step 1: Relate moles to particles using Avogadro's number

( N = n \times N_A )

Step 2: Substitute values and calculate

( N = 2.1 , \text{mol} \times 6.022 \times 10^{23} , \text{particles/mol} )

Answer:

( 1.26462 \times 10^{24} , \text{particles} )