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

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.

16

explanation:

the marks go by 4s