A hypothetical element, Rz, has two isotopes: 169Rz = 168.94 amu and 171Rz = 170

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A hypothetical element, Rz, has two isotopes: 169Rz = 168.94 amu and 171Rz = 170

A hypothetical element, Rz, has two isotopes: 169Rz = 168.94 amu and 171Rz = 170.98 amu. Eleven of every fifteen atoms of Rz found in nature exist as the 169Rz isotope. What is the average atomic mass of the element Rz?
A) 169.48 amu
B) 168.95 amu
C) 170.56 amu
D) 171.01 amu

Textbook

Introduction to Chemical Principles

Edition: 11^th

Author: Stoker

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