Asked by payton

which of the following samples has the greatest number of atoms

20 million O2 molecules
0.1 mole of Fe
2.0 mole of Ar
100 g of Pb
5 g of He
Answered by DrBob222
20 million O2 has 40 million O atoms.
0.1 mole Fe has 0.1 x 6.022E23 atoms.
2.0 moles Ar has 2.0 x 6.022E23
etc.
Hint:I would convert 100 g Pb and 5g He to moles and compare with the other moles.
Answered by rd
20 million O2 molecules
Answered by Jana
2.0 mole of Ar
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