The astronaut then measures the abundance of magnesium on the new planet, obtaining the following results: isotope abundance (%) mass (amu) 86 sr 9.46 85.91 87 sr 7.00 86.91 88 sr 83.54 87.91 what is the atomic mass of magnesium for this planet? express your answer to two decimal places, and include the appropriate units.

The average atomic mass of Strontium is 87.65 u

Explanation:

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

    .....(1)

Mass of isotope = 85.91 u

Percentage abundance of isotope = 9.46 %

Fractional abundance of isotope = 0.09460

Mass of isotope = 86.91 u

Percentage abundance of isotope = 7.00 %

Fractional abundance of isotope = 0.0700

Mass of isotope = 87.91 u

Percentage abundance of isotope = 83.54 %

Fractional abundance of isotope = 0.8354

Putting values in equation 1, we get:

Hence, the average atomic mass of Strontium is 87.65 u

idk

explanation: