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A Manual of the Chemistry of the Carbon Compounds

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THE CARBON COMPOUNDS. 25<br />

perature, and aa.soon as <strong>the</strong> volume <strong>of</strong> <strong>the</strong> vapour remains constant,<br />

<strong>the</strong> height <strong>of</strong> <strong>the</strong> mercurial column, <strong>of</strong> <strong>the</strong> barometer, and also <strong>the</strong><br />

temperature <strong>of</strong> <strong>the</strong> air are observed, and from <strong>the</strong>se numbers <strong>the</strong> vapour<br />

density is calculated as before. At higher temperatures <strong>the</strong> tension<br />

<strong>of</strong> mercury vapour must be taken into consideration.<br />

DETERMINATION OM THE MOLECULAR FORMULA.<br />

The vapour <strong>of</strong> hexane is, as we have seen, 43'1 times heavierthan<br />

hydrogen; <strong>the</strong> molecular weight <strong>of</strong> this hydrocarbon is consequently<br />

43'1 X 2 cs 86-2. Now, as we know its percentage composition, we<br />

can easily calculate how much carbon and hydrogen are contained<br />

in 86-2 parts by weight :—<br />

72

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