Answer:
2.46*10²¹
Step-by-step explanation:
atomic mass of p = 31
o = 16
molar mass of p2o5 = 31*2 + 16*5
=62+80
=142 g/mole
let atom number be x
0.580/142 = x/6.02*10²³
x = 0.58/142*[6.02*10²³]
x=2.46*10²¹
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