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

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.