Answer to Question #191711 in General Chemistry for flavia

Question #191711

Element contains two isotopes,78x(19.5%) and 80x(80.5%).What is the relative atomic mass of element x? option ....(A) 78.5 (B)79.6 (C)80.4 (D)80.8


1
Expert's answer
2021-05-11T05:56:50-0400

First convert the percentages to decimal form by dividing by 100. Then multiply the weight of each isotope by its percent abundance and add the results


Ar X = (0.195 × 78) + (0.805 × 80) = 79.61


(B)79.6

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