Chemistry: The Molecular Nature of Matter
Chemistry: The Molecular Nature of Matter
7th Edition
ISBN: 9781118516461
Author: Neil D. Jespersen, Alison Hyslop
Publisher: WILEY
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Chapter 20, Problem 126RQ

A complex ion of chromium(III) with oxalate ion was prepared from 51 Cr-labeled K 2 Cr 2 O 7 , having a specific activity of 843 cpm/g (counts per minute per gram), and 14 C

-labeled oxalic acid, H 2 C 2 O 4 , having an specific activity of 345 cpm/g. Chromium-51 decays by electron capture with the emission of gamma radiation, whereas 14 C is a pure beta emitter. Because of the characteristics of the beta and gamma detectors, each of these isotopes may be counted independently. A sample of the complex ion was observed to give a gamma count of 165 cpm and a beta count of 83 cpm. From these data, determine the number of oxalate ions bound to each Cr(III) in the complex ion. (Hint: For the starting materials calculate the cpm per mole of Cr and oxalate, respectively.)

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Chapter 20 Solutions

Chemistry: The Molecular Nature of Matter

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