Question

note: to answer some of the questions, it may help to reference a periodic table. isotope atomic mass abundance 84sr 83.913 0.56% 86sr 85.909 9.86% 87sr 86.909 7.00% 88sr 87.906 82.58% based on the information provided for the isotopes of strontium (sr), what is the average atomic mass of strontium? 87.62 amu 88.00 amu 86.25 amu 8.77 x 10^3 amu

Explanation:

Step1: Convert percentages to decimals

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

Step2: Calculate the contribution of each isotope

For $^{84}$Sr: $83.913\times0.0056 = 0.4699128$
For $^{86}$Sr: $85.909\times0.0986= 8.4706274$
For $^{87}$Sr: $86.909\times0.07 = 6.08363$
For $^{88}$Sr: $87.906\times0.8258=72.6827748$

Step3: Sum up the contributions

$0.4699128 + 8.4706274+6.08363 + 72.6827748=87.606945$ $\approx 87.62$

Answer:

87.62 amu