Chemistry: The Central Science (13th Edition)

by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.

Published by Prentice Hall

ISBN 10: 0321910419

ISBN 13: 978-0-32191-041-7

Chapter 5 - Thermochemistry - Exercises - Page 206: 5.44d

Answer

-303.36 KJ

Work Step by Step

The question is asking about the formation of CH3OH therefor the reaction is reversed which makes deltaH negative and thus being -252.8. in order to find the number of moles of CH3OH you need to divide the mass by the molar mass which is 16.04g/mol so 38.5\16.04 = 2.4 mol then multiply the number of moles by deltaH and divide by the number of moles. so 2.4 X -252.8 / 2 = -303.36KJ

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