The elements of thermal chemistry / by M.M. Pattison Muir ; assisted by David Muir Wilson.
- M. M. Pattison Muir
- Date:
- 1885
Licence: Public Domain Mark
Credit: The elements of thermal chemistry / by M.M. Pattison Muir ; assisted by David Muir Wilson. Source: Wellcome Collection.
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![® IS ''’'“Wrfpmi ”0 produce iiviirot toisic mquii}’ to a great maiiv ! takes part, we arrive at kdrogen is composed of Dany chemical reactions a ts occurs. of an elementary gas are )Osedoftwoatoin>;K'5“ I is the standard substance jttsofthemolecuk^^ that the atomic weight eight of the £istwo. jtofe=')'S^ SECT. V. § :U.] MOEECULAH WVEKiHTS. I7 Molecular ireights of elementary gases. 1 1 Name of element. i Temj}. of observation (approximate). Density H=l. Molecular- weight. Hydrogen 0 1 2 Nitrogen 0“ 14-02 28-02 , Oxygen 0—1400 15-9G 31-92 ,, ozone . Sulphur fiOO 23-93 . 95-55 47-88 191-88 i 800—1400 32-2 63-9G i Chlorine 200—1200 35-3G 70-74 Cadmium 1000 56-8 112-1 Pliosphoru.s O o r O o o G2 123-84 Arsenic GOO—800 150-5 299-G ! Bromine 100 78-75 159-5 ' yj about 1.500 .58-9 1 Seleniou 850 110-7 23G-4 1400 80-5 157-G Mercury 400“—1000 99-85 199-8 1 Iodine 200—800 125-85 253-07 yy 1300—1500 G8-7 [1 126-52] 250 Tellurium 1400 127 34*. It will be noticed that the uunibers in column iv. are not always exactly double those in column iii. The value obtained for the density of a gas is necessarily subject to errors of experiment; nor in chemical investigations do we attempt to determine these values by any very refined experimental methods. We rather find, with the greatest care and refinement of experiment possible, the value to he assigned to the combinino- weight ot each element, i.e. the mass of the element which combines with one part by weight of hydrogen or with 7'98 parts by weight of oxygen*. The molecular weight of an element must be equal to, or a multiple of its combining weight, and the molecular weight of a compound must be equal to the sum, or to a multiple of the sum of the combining weights of its con- stituent elements. Hence it follows, that accurate determinations of the combining weights of different elements, and approximately accurate determinations of the densities of these elements and theii compounds in the state of gase.s, furnish the data required * Heeante, par. 4.](https://iiif.wellcomecollection.org/image/b28065050_0039.jp2/full/800%2C/0/default.jpg)
