Chemistry: The Central Science (13th Edition)

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

Chapter 3 - Chemical Reactions and Reaction Stoichiometry - Exercises - Page 117: 3.76c


$CO_2$ - 6 molecules $H_2O$ - 8 molecules $O_2$ - 0 molecules $C_3H_8$ - 1 molecule

Work Step by Step

$C_3H_8+5O_2\rightarrow 3CO_2+4H_2O$ is the balanced equation. Oxygen is the limiting reactant, so rewrite the equation using 10 as the coefficient for oxygen. Multiply all coefficients by 2 to keep the equation balanced. $2C_3H_8+10O_2\rightarrow 6CO_2+8H_2O$ The balanced equation gives you the amount of each product. All the oxygen is consumed so zero molecules remain. Only 2 off the 3 propane molecules were used in the reaction so 1 remains.
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