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Calculate the average atomic mass of carbon, if the natural abundance of C – 12 and C – 13 are 98.90% and 1.10% respectively.

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Calculate the average atomic mass of carbon, if the natural abundance of C – 12 and C – 13 are 98.90% and 1.10% respectively.

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Average atomic mass of carbon

= (12 × 0.989) +(13 × 0.011) 

= 11.868 + 0.143 

= 12.011 amu.

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