An element has three naturally occurring isotopes. Use the information below to calculate the weighted average atomic mass of the element, showing both the setup and the final answer for the calculation. THE DATA WILL BE IN THE COMMENTS.

I'm not sure how to do this. Is there a formula? If so, what's the formula?

Question

An element has three naturally occurring isotopes. Use the information below to calculate the weighted average atomic mass of the element, showing both the setup and the final answer for the calculation. THE DATA WILL BE IN THE COMMENTS.

I'm not sure how to do this. Is there a formula? If so, what's the formula?

simplymarie_x · Answer

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trevor12 · Answer

average atomic mass of the element= 1.01(99.984/100) + 2.01(0.014/100) + 3.02(0.002/100) = 1.01 u

imqwerty · Answer

yes there is a formula

just multiply the percentage abundance with the atomic mass of all the isotopes and take the mean :) 
the mean is the average atomic mass

trevor12 · Answer

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