Question

Haemoglobin contains .25% iron by mass. The molecular mass of haemoglobin is 89600. Calculate the number of iron atoms per molecule of haemoglobin

Answer 1

Explanation:

hey mate

here is your answer

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.25 % by mass means 0.25 gms of iron in 100 gms of haemoglobin

.therefore in 89600 gms i.e. 1 mole of haemoglobin contains:  0.25 x 89600 = 896 x 0.25 = 224 gms of fe                           

But 1 mole of Fe i.e. 56 gms contains 6.023 x  ( Avogadro 's number) atoms.

therefore 224 gms of Fe will contain:  224 x 6.023 x  = 2.409 x 1024 atoms.

you can take NA as 6.022*10^23 also

                                                              56

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