Answer
$1\times10^{-6}kg$
Work Step by Step
To convert mg to kg you need a unit fraction that has mg in the denominator and kg in the numerator.
$1mg\times\frac{1\times10^{-3}g}{1mg}\times\frac{1\times10^{=3}kg}{1g}=1\times10^{-6}kg$
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 1 - Introduction: Matter and Measurement - Exercises - Page 36: 1.45b
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