. Elements of modern chemistry . necessary corrections for temperature and pressure, the 600volumes of gas are found to be reduced to 150 volumes; 450volumes have thus disappeared to form water. 142 ELEMENTS OF MODERN CHEMISTRY. These 450 volumes must have contained 300 volumes of hydrogen,150 volumes of oxygen. Consequently the 200 volumes of ammonia gas, which weredecomposed by the spark into 400 volumes, must have beenformed by the union of 300 volumes of hydrogen,100 volumes of nitrogen. The latter gas remains in the eudiometer, together with the50 volumes of oxygen that were employed in e
. Elements of modern chemistry . necessary corrections for temperature and pressure, the 600volumes of gas are found to be reduced to 150 volumes; 450volumes have thus disappeared to form water. 142 ELEMENTS OF MODERN CHEMISTRY. These 450 volumes must have contained 300 volumes of hydrogen,150 volumes of oxygen. Consequently the 200 volumes of ammonia gas, which weredecomposed by the spark into 400 volumes, must have beenformed by the union of 300 volumes of hydrogen,100 volumes of nitrogen. The latter gas remains in the eudiometer, together with the50 volumes of oxygen that were employed in excess. From this analysis it is seen that two volumes of ammoniacontain three volumes of hydrogen and one volume of nitrogen,a composition which is expressed by the formula Nff. Chemical Properties.—Ammonia gas is decomposed by ahigh temperature, as by a series of electric sparks. The experi-ment may be made by passing the gas through a porcelain tube. filled with fragments of broken porcelain and heated to white-ness, and collecting the gas resulting from the decomposition invessels filled with water (Fig. 57). This gas is found to be amixture of three volumes of hydrogen and one volume The decomposition takes place more readily if iron, copper,or platinum wires be introduced into the porcelain tube. The AMMONIA. 143 latter metal is not altered, but the iron and copper becomebrittle and retain a few per cent, of nitrogen. The decompo-sition of the ammonia seems here to be favored by the forma-tion of metallic nitrides, unstable compounds which are almostentirely decomposed by the prolonged action of the heat. Ammonia gag will not burn in the air, but a mixture of fourvolumes of ammonia and three volumes of oxygen will explodeon the application of a flame. 2Nff + 0^ == 3H^0 + N^ Ammonia will burn in an atmosphere of oxygen. A jet ofammonia escapingthrough a tube drawnout to a point may beignited on the instantthat it is
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