How many moles are 1.20×10^25 atoms of phosphorous

19.9. There are 19.9 mol P in 1.20×10^25 atoms P.

Use Avogadro’s number to convert atoms of P to moles of P

Moles of P = 1.20 × 10^25 atoms P × (1 mol P/6.022 × 10^23 atoms P)

= 19.9 mol P

the answer is:  

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