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Bromine has two stable isotopes (79Br and 81Br) with masses of 78.918338 u and 80.916291 u. 

The average molar mass of Br is 79.90 u. 

What is the percent abundance of 81Br? (Give your answer to two decimal figures.)

Broom het twee stabiele isotope (79Br en 81Br) met massas van 78.918338 u en 80.916291 u. 

Die gemiddelde molêre massa van Br is 79.90 u. 

Wat is die persentasie voorkoms van 81Br? (Gee jou antwoord tot twee desimale syfers.)

 
 
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