Natural abundances of ¹² C and ¹³ C isotopes of carbon are 99 % and 1 % , respectively. Assuming they only contributes to the mol. wt. of C ₂ F ₄ , the percentage of C ₂ F ₄ having a molecular mass of 101 is

Step-by-step 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 %