Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning
ISBN 10: 1133949649
ISBN 13: 978-1-13394-964-0

Chapter 5 Principles of Chemical Reactivity: Energy and Chemical Reactions - Study Questions - Page 217a: 33


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Work Step by Step

The reaction is exothermic because the enthalpy change of reaction is negative. $1.25\ g\div 30.00\ g/mol=0.0417\ mol\ NO$ From stoichiometry: $0.0208\ mol\ O_2$ Enthalpy change: $-114.1\ kJ/mol\times 0.0208\ mol=-2.38\ kJ$
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