JEE Main & Advanced Chemistry Structure of Atom / परमाणु संरचना Sample Paper Topic Test - Structure of Atom

Average atomic mass of magnesium is 24.32 amu. This Mg is composed of 79 mole % of \[^{24}Mg\] and remaining 21 mole % of \[^{25}Mg\] and \[^{26}Mg\]. Calculate the mole % of \[^{25}Mg\]

A) 10%

B) 20%

C) 22%

D) 11%

Correct Answer: D

Solution :

[d] Idea This problem is based on mole concept. This problem can be solved by considering value of mole % of Mg as x.

Let mole % of \[^{26}Mg=x\]

\[\frac{(21-x)25+x(26)+79(24)}{100}=24.32\]

\[x=10%\]

So, %\[^{25}Mg=21-10=11\]%

TEST Edge Mole % of isotope present in any compound are also be asked by supplying required parameters in questions. So, students are \[h{{v}_{1}}=h{{v}_{0}}+\frac{1}{2}mu_{1}^{2}\] advised to keep a good understanding of mole concept.

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JEE Main & Advanced Chemistry Structure of Atom / परमाणु संरचना Sample Paper Topic Test - Structure of Atom

question_answer Average atomic mass of magnesium is 24.32 amu. This Mg is composed of 79 mole % of \[^{24}Mg\] and remaining 21 mole % of \[^{25}Mg\] and \[^{26}Mg\]. Calculate the mole % of \[^{25}Mg\] A) 10% B) 20% C) 22% D) 11%

Average atomic mass of magnesium is 24.32 amu. This Mg is composed of 79 mole % of \[^{24}Mg\] and remaining 21 mole % of \[^{25}Mg\] and \[^{26}Mg\]. Calculate the mole % of \[^{25}Mg\]

A) 10%

B) 20%

C) 22%

D) 11%