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Question

The number of Fe Atoms in 100g Haemoglobin if it contains 0.33% Fe. (Atomic Mass Of Fe=56) is-


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Solution

Step 1: Given data

WHb=100g

Amount(Fe)=0.33%

Step 2: Calculating the mass of Fe atoms in 100g Hb:

WFe=0.33100×100=0.33g

Step 3: Calculating the number of moles of 0.33g Fe:

NumberofmolesofIron=weightofFeAtomicMassofFenFe=WFeMFe=0.3356=5.89×0-3

Step 4: Calculating the number of Fe atoms in 100g Hb:

nFe=WFeMFe=NumberofatomsofFe6.022×1023=5.89×0-3NumberofatomsofFe6.022×1023=5.89×0-3NumberofatomsofFe=5.89×0-3×6.022×1023NumberofatomsofFe=3.54×1021

Therefore, the number of atoms in 100g Hb is 3.54×1021.


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