General Chemistry (4th Edition)

Published by University Science Books
ISBN 10: 1891389602
ISBN 13: 978-1-89138-960-3

Chapter 3 The Periodic Table and Chemical Periodicity - Problems: 1


1. a) 2P(s) +3Br(l) = 2PBr3(l) b) 2H2O2(l) = 2H2O(l) + O2(g) c) 4CoO(s) + O2(g) = 2Co2O3(s) d) PCl5(s) + 4H2O(l) = H3PO4(l) + 5HCl(g)

Work Step by Step

a) P(s) + Br2(l) = PBr3(l) On the addition of phosphorus and bromine gives phosphorus tribromide. Bromine already has 3 molecules on the right therefore keeping that in mind phosphorus should be balanced. Whereas, bromine has 2 molecules on the left so add 3 in front of Br making the total number of bromine molecules 6 on the left, add 2 in front of PBr3 making bromine balanced but not phosphorus. On the left add 2 in front of solid phosphorous making the entire equation balanced. Similarly b,c and d can be solved.
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