Chemistry: Molecular Approach (4th Edition)

Published by Pearson
ISBN 10: 0134112830
ISBN 13: 978-0-13411-283-1

Chapter 2 - Exercises: 118

Answer

Zinc= 3.3x10^24 Copper = 5.7x10^24

Work Step by Step

Total mass = Density x volume 8.48x112.5=954 grams multiply total mass by percent to find how much zinc weighs and how much copper weighs. .37x954=352.98g Zn (.100-.37)954=601.02g Cu find the moles of each compound 601.02/63.55= 9.46 Multiply moles by 6.022x10^23 for the amount of atoms = 5.7x10^24 atoms of Cu Do the same for zinc, 352.98/65 38 =5.4 Mol 5.4x 6.022x10^23=3.3x10^24
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