Question

1. strontium consists of four isotopes with masses of 84 (abundance 0.50%), 86 (abundance of 9.9%), 87 (abundance of 7.0%), and 88 (abundance of 82.6%). calculate the atomic mass of strontium.

Explanation:

Step1: Convert percentages to decimals

0.50% = 0.005, 9.9% = 0.099, 7.0% = 0.07, 82.6% = 0.826

Step2: Multiply each isotope mass by its abundance

For isotope - 84: \(84\times0.005 = 0.42\)
For isotope - 86: \(86\times0.099=8.514\)
For isotope - 87: \(87\times0.07 = 6.09\)
For isotope - 88: \(88\times0.826 = 72.688\)

Step3: Sum up the results

\(0.42+8.514 + 6.09+72.688=87.712\)

Answer:

87.712