Q.a sample of vitamin c contains 2.48 * 10power 25 atoms.how many moles of oxygen atoms are present in the sample?

Vitamin C has the chemical formula C₆H₈O₆. Thus, in one molecule of vitamin C, there are in total 20 atoms (6 atoms of carbon, 8 atoms of hydrogen and 6 atoms of oxygen). Now in one mole of vitamin C, there are 6.023 X 10²³ molecules of vitamin C. Therefore total number of atoms in one mole of vitamin C will be

= 20 X 6.023 X 10²³

= 1.2046 X 10²⁵

The percentage of oxygen atoms in the total number of atoms in one molecule of vitamin C

= (6 X 6.023 X 10²³ X 100) /  1.2046 X 10²⁵

=  30 %

So, the number of oxygen atoms in the sample of vitamin C which contains 2.48 X 10²⁵ atoms will constitute 30%.

Hence (30 / 100) X 2.48 X 10²⁵ = 7.44 X 10²⁴

Therefore, in a sample of vitamin C containing 2.48 X 10²⁵ atoms, the number of oxygen atoms will be 7.44 X 10²⁴.