Chemistry: The Central Science (13th Edition)

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

Chapter 5 - Thermochemistry - Exercises: 5.55b


41.66 kJ/mol

Work Step by Step

In part a we found that the NaOH dissolving releases 6.772 kJ of heat. This was for a 6.50g sample so to find the kJ/mol we need to convert it to moles. We need the molar mass of NaOH as follows: Na is 22.99 g/mol O is 16 g/mol H is 1 g/mol NaOH is 39.99 g/mol Therefore, 6.50 g is : 6.50g * (1mol/39.99g) = 0.1625 mol Therefore, if 6.772 kJ was released for 0.1625 mol we divide the two to find the kJ/mol : 6.772kJ/0/1625mol = 41.66 kJ/mol
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