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sarahc
Group Title
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.
 one year ago
 one year ago
sarahc Group Title
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.
 one year ago
 one year ago

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matt101 Group TitleBest ResponseYou've already chosen the best response.0
See the answer I gave here: http://openstudy.com/study#/updates/50f82646e4b007c4a2eb8629 Exact same method, just use your numbers instead.
 one year ago

sarahc Group TitleBest ResponseYou've already chosen the best response.0
Is this correct? Average atomic mass= 99.762*15.99+0.038*16.99+0.200*17.99 Average atomic mass= 88.01562
 one year ago

matt101 Group TitleBest ResponseYou've already chosen the best response.0
You're close. Just remember how to express percentages: for instance, 99% = 0.99 The masses of the isotopes are about 1618, so you would expect the average mass to be around that too. A mass of 88 is way too high so you know you need to check your work.
 one year ago
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