Chemistry and Chemical Reactivity (9th Edition)

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

Chapter 3 Chemical Reactions - Study Questions - Page 137a: 3


a) $4Cr + 3O_{2} → 2Cr_{2}O_{3}$ b) $Cu_{2}S + O_{2} → 2Cu + SO_{2}$ c) $C_{6}H_{5}CH_{3} + 9O_{2} → 4H_{2}O + 7CO_{2}$

Work Step by Step

a) $4Cr + 3O_{2} → 2Cr_{2}O_{3}$ four moles of chromium reacts with three moles of oxygen to form two moles of chromium oxide. b) $Cu_{2}S + O_{2} → 2Cu + SO_{2}$ one mole of copper sulfide reacts with one mole of oxygen to form two moles of copper in free state and one mole of sulfer dioxide. c) $C_{6}H_{5}CH_{3} + 9O_{2} → 4H_{2}O + 7CO_{2}$ one mole of toluene reacts with nine moles of oxygen to form four moles of water and seven moles of carbon dioxide.
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