Q30Long answer
A sample of vitamic C is known to contain 2.58 ×1024 oxygen atoms. How many moles of oxygen atoms are present in the sample?
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1 mole of oxygen atoms = 6.023×1023 atoms 2.58 ×1024 ∴Number of moles of oxygen atoms = 6.022 ×102 3 = 4.28 mol 4.28 moles of oxygen atoms.