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Formula unit is (molar mass) * (6.0221421*10^23)

Molar mass of PbO2 is

239.2089 g/mol

Molar mass of 50.0g of PbO2 is 50/239.2089 g/mol

Formula unit of PbO2 is ( 50g/239.2089 g/mol) *

(6.0221421*10^23)

=(

0.20902232316606948988938120613405mol) *(6.0221421*10^23units/mol)

=

1.2587621321781923665883669044087*10^23units

or approx. 1,26.1023 formula units.

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