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13)
Calculate the atomic mass of C by using the data from carbon isotopes.

The abundance of 12C is 98.93%. 13C is another naturally occurring isotope. What is the percent abundance of 13C?

The mass of 13C is 13.003 amu. Multiply the mass of 13C by its abundance. Report the number to 3 significant digits.

The mass of 12C is 12.000 amu. Multiply the mass of 12C by its abundance. Report the number to 5 significant digits.

Add the last two numbers together to get the atomic mass of carbon. Report the number to 5 significant digits.

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