Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 3 - Chemical Reactions and Reaction Stoichiometry - Exercises - Page 114: 3.23f

Answer

200 amu

Work Step by Step

Chromium (III) sulfide has a molecular formula equal to $Cr_2S_3$. The molecular mass of the compound is obtained through the atomic masses of the elements (Cr and S) and by the number of atoms of each element. Therefore, MM ($Cr_2S_3$) =$(2\times52)+(3\times32) =200amu$ Note: 200 amu or 200 u, these are similar nomeclatures.
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