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Topic: Stuck on this question  (Read 949 times)

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Offline MagicMoriarty

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Stuck on this question
« on: May 08, 2020, 09:57:10 AM »
The question says “State why the precise relative atomic mass for the carbon-12 isotope is exactly 12.00000”

I think it’s something to do with all the other atomic masses being based off Carbon-12 but I don’t know.
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Offline chenbeier

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Re: Stuck on this question
« Reply #1 on: May 08, 2020, 10:59:59 AM »
It was choosen. 1/12 of the isotope 12C has the weight 1 u . In the past also hydrogen and oxygen was taken. The precise number came out with carbon.
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