A Manual of the Chemistry of the Carbon Compounds

THE CARBO
A determination of the va
method gave the following resu
Weight of pentane . .
Temperature of air
Temperature of vapour
Volume of vapour . .
Height of barometer .
Difference of level .
91'
59'5 cb. cm.
752 mm.
220 mm.
The pressure inside the bell-jar was consequently
equal to that of a columu of mercury
of 752 mm. at 16° minus that of a column of
220 mm. at 91°. In order to be able to subtract
one from the other we must first reduce
them to the same temperature. The coefficient
of expansion of mercury is 0-00018; the heights
at 0° would therefore be—
(000018 x 16)
220
1 + (0O0018 x 91)
216-4.
The pressure inside the bell-jar was therefore—
7499-216-4 = 533-5. fto.6.
59-5 ob. cm. of pentane weigh at 91°, and under a pressure of
533 5 mm. of mercury, 0-101 grams. An equal volume of hydrogen
weighs under the same conditions—
000008936 x 595 x 533-5 x 273 ft nno^fta