Answer
26.0 inches Hg
Work Step by Step
$661.55\ torr\times\frac{1\ mm\ Hg}{1\ torr}\times\frac{1\ cm\ Hg}{10\ mm\ Hg}\times\frac{1\ in\ Hg}{2.54\ cm\ Hg}=26.045\ in\ Hg=26.0\ in\ Hg$
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