Chemistry and Chemical Reactivity (9th Edition)

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

Chapter 4 Stoichiometry: Quantitative Information about Chemical Reactions - Study Questions - Page 179j: 122



Work Step by Step

Number of moles of NaOH: $11.1\ mL\times 0.121\ M=1.34\ mmol$, same as excess HCl. Total number of moles of HCl: $50.0\ mL\times 0.100\ M=5.00\ mmol$ Number of moles consumed: $5.00-1.34=3.66\ mmol$, same as ammonia. From stoichiometry, the number of moles of ammonium sulfate: $1.83\ mmol$ Mass: $0.00183\ mol\times 132.14\ g/mol=0.242\ g$ Mass percentage: $0.242/0.475\times100\%=50.91\%$
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