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MHT CET 202626 AprilMorning Shift

Exam: MHT CET
Year: 2026
Date: 26 April
Shift: Morning Shift
Subject: Chemistry
Chapter: Some Basic Concepts of Chemistry

MHT CET 2026 · 26 April · Morning Shift · Chemistry · Some Basic Concepts of Chemistry

A coordination complex contains 2.6\ \% of Mg. Find the number of...

A coordination complex contains

2.6\ \%

of Mg. Find the number of Mg atoms in

5.0

g of this sample.
(gram atomic mass of Mg

= 24

g )

Options

A $1.5 \times 10^{21}$
B $3.26 \times 10^{21}$
C $2.82 \times 10^{21}$
D $4.3 \times 10^{21}$

Correct answer

B. $3.26 \times 10^{21}$

Step-by-step solution

Mass of the sample

= 5.0

g

Percentage of Mg in the complex

= 2.6\ \%

Mass of Mg in the sample

= \dfrac{2.6}{100} \times 5.0 = 0.13

g

Number of moles of Mg

= \dfrac{0.13}{24}

mol

Number of Mg atoms

= \dfrac{0.13}{24} \times 6.022 \times 10^{23}

Number of Mg atoms

= 3.26 \times 10^{21}

Answer:

3.26 \times 10^{21}

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