Sulphur vaporization

In a word, if when an oil burns it does not cause a sufficient decomposition of the alum and the vitriol, the flame ought not to be increased, for in our hypothesis the acid of the salt ought to leave its terrestrial matrix and carry its action on to the sulphurous vapor, and... 

Part (c) shows that some hydrogen sulphide is formed when a mixture of hydrogen and sulphur vapor is heated to redness, and it is thus clear that neither the synthesis nor the decomposition of hydrogen sulphide is complete at this temperature but that hydrogen sulphide reaches an equilibrium with its products according to the reversible reaction. 

Fundamental thermodynamic and kinetic studies of the decomposition reaction (1) have confirmed that hydrogen sulphide is a stable sulphide and that the dissociation is thermodynamically unfavorable below 1800°K. Nevertheless, some decomposition does, of course, occur below these temperatures and equilibrium hydrogen yields range from less than 1% at 750°K through about 5% at 1000°K to almost 30% at 1400°K. [These values are based on equilibrium product calculations which considered all possible sulphur/hydrogen species which could be present at equilibrium including various sulphur vapor species (S S to S ), and sulphanes (H2Sx) as well as H2S, H and The values which are... 

Dumas heated 10,000 grains of silver in sulphur vapor and obtained 11,481.5 grains of silver. sulphide. What is the atomic weight of sulphur (Assume Ag = 108, and Ag -J- S = Ag, S.)... 

In the first place, if the variance of the system is negative the system can be in equilibrium at no temperature and under no pressure thus it would be impossible to have, at any temperature or pressure, in a state of equilibrium a system which would simultaneously include sulphur vapor, liquid sulphur, the orthorhombic form and the monoclinic form such a S3rstem would enclose a single component divided into four phases from equation (2) the variance would be —1. 

Since this time, analogous facts have multiplied formic acid and nitrogen peroxide show similar variations to those manifested by acetic acid Troost and Hautefeuille have-proved that the density of sulphur vapor, at atmospheric pressure, passed sensibly from the value 6.6 to the value 2.2 when the temperature went from 500 C. to 1000 C. the experiments of Crafts and Meier, performed by the method of displacement of air, showed that iodine vapor density nearly constant and equal to 8.8 while the temperature remained less than 700 C., rapidly decreased beyond reaching a value slightly greater than 4.4 when the temperature exceeded 1600 . 

But if, in these various cases, we can put beyond doubt the existence of the same gas in two distinct polymeric forms, we are indebted to the phenomena of false equilibrium in the conditions of temperature and pressure for which the states of false equilibrium would not be produced, oxygen, taken in definite conditions, would always enclose a determined amount of ozone at a given pressure and temperature its properties would.be perfectly determined but its density taken with respect to a perfect gas would vary with the pressure and with the temperature oxygen would behave, in terms of the variation of density produced by a rise in temperature, just as do sulphur vapor, iodine vapor, acetic acid vapor one may not, therefore, argue from this fact that at a given pressure and temperature each of these gases exists in a perfectly determined state in order to deny, for each of them, the coexistence of two polymers one may nierely conclude there are not produced phenomena of false equilibrium in the conditions of temperature and pressure for which the experiments have been performed. 

In mixing the saltpetre with the flowers of sulphur sulphurous vapors arc developed which form moist luinps in the mass. To secure a good ignition... 

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