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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 

∴Number of moles of oxygen atoms =   2.58 ×1024 / 6.022×1023 

                                                          = 4.28 mol 

4.28 moles of oxygen atoms. 

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