Chemistry (4th Edition)

Published by McGraw-Hill Publishing Company
ISBN 10: 0078021529
ISBN 13: 978-0-07802-152-7

Chapter 3 - Questions and Problems: 3.42

Answer

Hydrogen has more atoms.

Work Step by Step

Number of atoms= No of moles $\times N_{A}$. Number of hydrogen atoms= $\frac{0.302g}{1.008gmol^{-1}}\times\frac{6.022\times10^{23}}{1mol}\approx1.80\times10^{23}$. Number of Chromium atoms = $\frac{14.7g}{51.996gmol^{-1}}\times\frac{6.022\times10^{23}}{1mol}\approx 1.70\times10^{23}$. Comparing the results, we find that hydrogen has more atoms.
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