JEE Main 2022 · 26 Jul · Shift 2 · Chemistry Q61

ChemistrySingle correct+4 / -1Question 61 of 90

Hemoglobin contains 0.34% of iron by mass. The number of Fe atoms in 3.3 g of hemoglobin is

(Given: Atomic mass of Fe is 56 u, $N_A=6.022\times10^{23}$ mol $^{-1}$ )

1.21\times10^5

12.0\times10^{16}

1.21\times10^{20}

3.4\times10^{22}

Answer and worked solution

Official answer: C

Iron mass $3.3\times0.0034=0.01122$ g, i.e. $2.0\times10^{-4}$ mol.

Atoms $2.0\times10^{-4}\times6.022\times10^{23}\approx1.21\times10^{20}$ .

(C)

Topics:Mole concept

JEE Main 2022 · 26 Jul · Shift 2, Chemistry question 61