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Verified Answer :

HomertheGenius

m ( P 2 O 5) = 0.210 g
M ( P 2 O 5 ) = 2 30 + 5 16 ( from the Periodic Table ) =
= 60 + 80 = 140 g/mol
N = m / M = 0.210 g/ 140 g/mol = 0.0015 mol
Avogadro Constant: N a = 6.02 10^23 
n = N N a  = 0.0015 6.02 10^23 = 
= 0.00903 10^23 = 9.03 10^20 atoms

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