Answer
4%
Work Step by Step
Weight % of A=
$\frac{mass\,of\,A}{mass\,of\,A+mass\,of\,B+mass\,of\, solvent}\times100\%$
$=\frac{0.2g}{0.2g+0.3g+5g}\times100\%$= 4%
Chemistry: The Molecular Science (5th Edition)
by Moore, John W.; Stanitski, Conrad L.
Published by
Cengage Learning
ISBN 10:
1285199049
ISBN 13:
978-1-28519-904-7
Chapter 13 - The Chemistry of Solutes and Solutions - Questions for Review and Thought - Topical Questions - Page 605e: 101
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