Question

HAEMOGLOBIN IS AN IRON CONTAINING PROTEIN THAT TRANSPORTS OXYGEN FROM LUNGS TO THE REST OF THE BODY .IT CONTAINS 0.3% OF IRON BY MASS [ATOMIC MASS OF IRON IS 56 U] .WHAT IS THE NUMBER OF ATOM PRESENT IN 5 GRAM OF HAEMOGLOBIN

Answer 1

%age of iron = 0.30%
Molecular wt of Haemoglobin = 67200
Atomic weight of iron = 56
No of Fe atoms = $\frac{\mathrm{Molecular}\mathrm{wt}\mathrm{of}\mathrm{haemoglobin}\times 0.3}{100\times \mathrm{Atomic}\mathrm{wt}\mathrm{of}\mathrm{Fe}}$=$\frac{67200\times 0.3}{100\times 56}$
= 4