Afictitious element q has two naturally occurring isotopes. the first isotope has an abundance of 20.00% and a mass of 39.96 amu and the second isotope of element q has an abundance of 80.00% and a mass of 43.39amu. calculate the weighted atomic mass of element q to the nearest tenth. to earn credit, be sure to show the work that leads to your answer.

42.7 amu

Explanation:

The natural element will have an atomic mass that includes 20% of the 39.96 amu isotope, plus 80% of the 43.39 amu isotope. This can be written using the decimal forms of percent as:

0.2 * 39.96 + 0.8 * 43.39 = 42.704 amu

This answer, rounded to the nearest tenth is: 42.7 amu

Average Atomic mass is the sum of the atomic mass of the isotopes multiplied by the abundance

Thats why we get a fractional number as atomic mass.

The formula to find the average atomic mass is

Average atomic mass

= 42.7 amu is the Answer to the nearest tenth

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