Question

please answer it fast ....


naturally occurring Boron consists of two isotopes whose atomic weight 10.01 and 11.01weight of natural granite 10.81 calculate the percentage of each isotope in natural born .

Answer 1

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average atomic weight

percentage of an ISOTOPE × atomic weight / 100

10.81 = 10.01x + 11.01 (100-x) / 100

x= 20%

therefore natural boron 20% (10.01) isotope and 80% other isotope.

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