multiple choice 10 points\nan unknown compound is found to have the following stable isotopes:\n| isotope |…

multiple choice 10 points\nan unknown compound is found to have the following stable isotopes:\n| isotope | atomic mass (amu) | percent abundance (%) |\n| ---- | ---- | ---- |\n| 1 | 13.913 | 0.56 |\n| 2 | 15.909 | 9.86 |\n| 3 | 16.909 | 7.00 |\n| 4 | 17.500 | 82.58 |\ndetermine the weighted average atomic mass for this compound.\n16.91\n17.28\n16.06\n17.55

multiple choice 10 points\nan unknown compound is found to have the following stable isotopes:\n| isotope | atomic mass (amu) | percent abundance (%) |\n| ---- | ---- | ---- |\n| 1 | 13.913 | 0.56 |\n| 2 | 15.909 | 9.86 |\n| 3 | 16.909 | 7.00 |\n| 4 | 17.500 | 82.58 |\ndetermine the weighted average atomic mass for this compound.\n16.91\n17.28\n16.06\n17.55

Answer

Explanation:

Step1: Convert percentages to decimals

$0.56% = 0.0056$, $9.86%=0.0986$, $7.00% = 0.07$, $82.58%=0.8258$

Step2: Calculate weighted - value for each isotope

For isotope 1: $13.913\times0.0056 = 0.0779128$ For isotope 2: $15.909\times0.0986=1.5686274$ For isotope 3: $16.909\times0.07 = 1.18363$ For isotope 4: $17.500\times0.8258 = 14.4515$

Step3: Sum up the weighted - values

$0.0779128+1.5686274 + 1.18363+14.4515=17.2816702\approx17.28$

Answer:

17.28