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Grade: 11

                        

Hemoglobin contains 0.25% iron by weight. The molecular weight of hemoglobin is 89600. Calculate number of iron per molecular weight of compound?

2 years ago

Answers : (1)

Arun
24742 Points
							
Dear Rishita
 
 

0.25 % by mass means:

0.25 gms of iron in 100 gms haemoglobin.

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

                                                                                             100

But 1mole of Fe i.e. 56 gms comtains 6.023 x 1023 ( Avogadro number. NA) atoms.

therefore 224 gms of Fe will contain:  224 x 6.023 x 1023  = 2.409 x 1024 atoms.

                                                               56

 

2 years ago
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