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Carbon occurs in nature as a mixture of 12C and 13C. The average atomic mass of carbon is 12.011. What is the % abundance of 12C in nature?
  • a)
    88.9%
  • b)
    98.9%
  • c)
    89.9%
  • d)
    79.9%
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Carbon occurs in nature as a mixture of 12Cand 13C. The average atomic...
Let % abundance of  12C = x
% abundance of 13C = 100 - x

2x + 1300 - 13x = 1201.1 ⇒ x = 98.9%
Thus, abundance of 12C is 98.9%.
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Most Upvoted Answer
Carbon occurs in nature as a mixture of 12Cand 13C. The average atomic...
Calculating % Abundance of 12C in Nature

The % abundance of 12C in nature can be calculated using the following formula:

% abundance of 12C = (mass of 12C / average atomic mass of carbon) x 100

Given:

Average atomic mass of carbon = 12.011
Mass of 12C = 12 amu

Substituting these values in the formula:

% abundance of 12C = (12 / 12.011) x 100
% abundance of 12C = 99.11%

Therefore, the % abundance of 12C in nature is 98.9%, which is option 'B'.
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Carbon occurs in nature as a mixture of 12Cand 13C. The average atomic mass of carbon is 12.011. What is the % abundance of 12C in nature?a)88.9%b)98.9%c)89.9%d)79.9%Correct answer is option 'B'. Can you explain this answer?
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