. Introduction to inorganic chemistry . rture and barometric pressure are volume is determined by displacingthe gas once more from the flask, fillingwith water, and weighing again. Thedifference in weight between the emptyflask and the flask full of water, in grams,represents the volume of the content of theflask in cubic centimeters. This volumeis reduced to 0° and 760 mm. by the rulesdiscussed above, and we have then a volumeof the gas and the corresponding weight. To illustrate, let us suppose that thevolume of the flask is 200 and that itis filled with oxygen at 17° and 742 m
. Introduction to inorganic chemistry . rture and barometric pressure are volume is determined by displacingthe gas once more from the flask, fillingwith water, and weighing again. Thedifference in weight between the emptyflask and the flask full of water, in grams,represents the volume of the content of theflask in cubic centimeters. This volumeis reduced to 0° and 760 mm. by the rulesdiscussed above, and we have then a volumeof the gas and the corresponding weight. To illustrate, let us suppose that thevolume of the flask is 200 and that itis filled with oxygen at 17° and 742 weight, we will suppose, is found to g. We ascertained (p. 88) by calcula-tion that at 0° and 760 mm. this volumewould be The weight of a literis given by the proportion ::1000: X. Here x = g. When the operation is performed carefully, and the weighing carried to thenearest, milligram instead of the nearest centigram, a result moreWarly approaching the exact one () may easily be FlO. 29. 90 INORGANIC CHEMISTRY To get the density of oxygen referred to hydrogen as unity, wemust divide the answer by the weight of a liter of hydrogen ( g.).In the above case the quotient is The accepted value is density referred to air as unity is similarly obtained by dividingby , the weight of a liter of air at 0° and 760 mm. pressure. If a suitable pump is not available, the flask, in this case provided with twoopenings, is weighed without preliminary exhaustion. This gives the weight ofbhe vessel plus thai of the air it contains. A continuous stream of the gas is then,iassed into the flask until the air has been completely displaced. The vessel istVien dosed and another Finally the gas is displaced by water,und a tJiird weighing taken. The temperature and barometric pressure are notedas usual. The last weighing gives the volume as before. Knowing that one literof air weighs g. at 0° and
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