# Calculate the number of moles present in: 3.011 x 10^23 number of oxygen atoms. 60 g of calcium

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Calculate the number of moles present in:

1. 3.011 x 1023 number of oxygen atoms.
2. 60 g of calcium

[Given that atomic mass of Ca = 40 u, Avogadro No. = 6.022 x 1023]

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1 mole of oxygen contains 6.022 x 1023 atoms

$\therefore$ 6.022 x 1023 atoms of oxygen = 1 mol

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