Avogadro s theory

Then he swiftly produced as many different varieties of the compounds as possible, including dimethylzinc, which convinced other scientists to accept Avogadro s theory, a foundation of atomic chemistry and methyl-mercury iodide, the first of many organomercury compounds known to poison people who eat mercury-contaminated fish. Despite his skill at synthesis, Frankland did not discover tetraethyl lead, the gasoline additive that became one of the most important industrial compounds of the mid-twentieth century (Chapter 6). 

Physical Properties.—Density.—The density corresponds to simple molecules, PHS, but deviations from the laws of a perfect gas are observed. The weight of a normal litre is 1-5293 to 1-5295 gram,5 a value which shows that under these conditions it agrees closely with Avogadro s theory. At pressures of 10 atmospheres or more, however, and at temperatures from 24-6° to 54-4° C. the compressibility is much greater than is allowed by Boyle s law. The following values refer to 24-6° C. —6... 

Dalton s and Avogadro s theories became cornerstones of modem science. They also gave simple explanations of the constant compositions of chemical compounds and to Proust s law of definite proportions. 

---