Question

calculate the atomic mass for carbon using the following data: mass number exact weight percent abundance 12 12.000000 98.90 13 13.003355 1.10 a 15.236 amu b 10.023 amu c 12.011 amu d 5.789 amu

Explanation:

Step1: Convert percentages to decimals

$98.90\% = 0.9890$, $1.10\%=0.0110$

Step2: Calculate weighted - contributions

For carbon - 12: $12.000000\times0.9890 = 11.868$
For carbon - 13: $13.003355\times0.0110=0.143036905$

Step3: Sum up weighted - contributions

$11.868 + 0.143036905=12.011036905\approx12.011$ amu

Answer:

C. 12.011 amu