Question

Calculate the average atomic mass of carbon if 98.90% of the atoms are c-12 (12.000000 amu) and 1.100% are c-13 atoms (13.003354 amu). type in your answer using 2 decimal places. ma for carbon = amu

Answer 1

$\frac{(12.000000)(1.100)+(13.003354)(100-1.100)}{100}=\boxed{12.99 \text{ amu}}$