Final answer:
To find the average atomic mass of strontium, you multiply each isotope's mass by its natural abundance as a decimal and then sum the resulting figures. The calculated average atomic mass for strontium is 87.476607 amu.
Step-by-step explanation:
To calculate the average atomic mass of strontium using the given isotopes and their respective mass percentages, we will multiply each isotope's mass by its abundance, convert the abundance percentage to a decimal, and then sum these figures. Here's the calculation:
- (43.65% × 87.05 amu) / 100 = 0.4365 × 87.05 = 37.977325 amu
- (48.24% × 87.93 amu) / 100 = 0.4824 × 87.93 = 42.403032 amu
- (8.11% × 87.50 amu) / 100 = 0.0811 × 87.50 = 7.09625 amu
Add these values together to find the average atomic mass:
37.977325 amu + 42.403032 amu + 7.09625 amu = 87.476607 amu
Therefore, the average atomic mass of strontium is 87.476607 amu.