Answer to Question #191711 in General Chemistry for flavia

Question

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

Answer 1

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