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Question

Haemoglobin contains 4.6% of iron by mass. If the compound contains a single atom of iron then what is its molar mass in g mol1?

A
1217.4
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B
1324.7
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C
1232.4
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D
1317.5
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Solution

The correct option is A 1217.4
The percentage of Iron is 4.6%

This means that 4.6 g of Iron will be present in 100 g of haemoglobin.

1 g of iron will be present in 1004.6 g of haemoglobin.

Molar mass of Iron 56 g mol1

56 g mol1of iron will be present in 100×564.6g mol1 of haemoglobin.

Molar mass of haemoglobin is=56004.6=1217.4 g mol1

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