Answer
See the answer below.
Work Step by Step
Mass required:
$0.125\ mol\times 22.9898\ g/mol=2.87\ g$
Volume:
$2.87\ g\div 0.97\ g/cm^3=2.96\ cm^3$
In a perfect cube, the side would have:
$\sqrt[3]{2.96\ cm^3}=1.43\ cm$
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