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

Expert's answer

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 Ã— 78) + (0.805 Ã— 80) = **79.61**

**(B)79.6**

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