Question

using the information in the table to the right, calculate the average - atomic mass of strontium. report to two decimal places. strontium

Explanation:

Step1: Convert abundances to decimals

Abundance of \(Sr - 84\): \(0.56\%=0.0056\)
Abundance of \(Sr - 86\): \(9.86\% = 0.0986\)
Abundance of \(Sr - 87\): \(7.00\%=0.07\)
Abundance of \(Sr - 88\): \(82.58\%=0.8258\)

Step2: Calculate weighted - mass for each isotope

For \(Sr - 84\): \(83.913429\times0.0056 = 0.470\) (approx)
For \(Sr - 86\): \(85.909275\times0.0986=8.470\) (approx)
For \(Sr - 87\): \(86.908902\times0.07 = 6.084\) (approx)
For \(Sr - 88\): \(87.905625\times0.8258 = 72.583\) (approx)

Step3: Sum up the weighted - masses

\(0.470+8.470 + 6.084+72.583=87.607\approx87.61\)

Answer:

\(87.61\) amu