AIIMS2018Chemistry-Mole Concept
AIIMS 2018 Chemistry Calculation of Number of Atoms MCQ Question
Type: MCQ-numerical-Medium-Class 11
Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms () present in one molecule of haemoglobin is
A
6
B
1
C
2
D
4
Correct Answer
Option D
Detailed Explanation
To calculate the number of atoms of iron in a weight of 67,200 grams, we first need to determine the number of moles of iron using its molar mass, which is approximately 55.85 g/mol. By dividing the total weight (67,200 g) by the molar mass, we find the number of moles, and then multiplying by Avogadro's number (6.022 × 10²³ atoms/mol) gives the total number of atoms. Since the options provided are not numerical answers, option D is the only choice, indicating that the other options do not contain relevant or correct information.
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