KVPY SA Exam 2013 Question Paper

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Question : 74 of 80

Marks: +1, -0

N atural abundances of

^12C

and

^13C

isotopes of carbon are 99% and 1%, respectively. Assuming they only contribute to the mol. wt. of

C_2F_4

, the percentage of

C_2F_4

having a molecular mass of 101 is

1.98
98
0.198
99

Solution:

Percentage of

\C_2\F_4

of Molar mass 100

=1/100×1/100×100=0.01%

Percentage of

\C_2\F_4

of Molar mass 102

= 99/100×99/100×100=98.01%

Percentage of

\C_2\F_4

of Molar mass 101

=100-(0.01+98.01)=1.98%

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