## Chemistry 10th Edition

Published by Brooks/Cole Publishing Co.

# Chapter 4 - The Structure of Atoms - Exercises - Atomic Composition, Isotopes, and Atomic Weights - Page 165: 31

#### Answer

Atomic mass of Nickel = $58.6934amu$

#### Work Step by Step

Mass of $^{58}Ni = 57.9353 amu$ % abundance of $^{58}Ni = 68.08\%$ Mass of $^{60}Ni = 59.9308 amu$ % abundance of $^{60}Ni = 26.22\%$ Mass of $^{61}Ni = 60.9311amu$ % abundance of $^{61}Ni = 1.14\%$ Mass of $^{62}Ni = 61.9283 amu$ % abundance of $^{62}Ni = 3.63\%$ Mass of $^{64}Ni = 63.9280amu$ % abundance of $^{64}Ni =0.93\%$ The atomic mass of an element is the weighted average of the constituent isotopes. Therefore, atomic mass of Nickel = $0.6808(57.9353amu)+0.2622(59.9308amu)+0.0114(60.9311amu)+0.0363(61.9283amu)+0.0093(63.9280amu)$ Atomic mass of Nickel = $58.6934amu$

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