Note 29 — Chapter VII · MOLECULES AND ATOMS. THE LAWS OF GAY-LUSSAC AND AVOGADRO-GERHARDT

We will cite one more example, showing the direct dependence of the properties of a substance on the molecular weight. If one molecular part by weight of the various chlorides—for instance, of sodium, calcium, barium, &c.—be dissolved in 200 molecular parts by weight of water (for instance, in 3,600 grams) then it is found that the greater the molecular weight of the salt dissolved, the greater is the specific gravity of the resultant solution.

Molecular weight Sp. gr. at 15° Molecular weight Sp. gr. at 15°

HCl 36·5 1·0041 CaCl₂ 111 1·0236

NaCl 58·5 1·0106 NiCl₂ 130 1·0328

KCl 74·5 1·0121 ZnCl₂ 136 1·0331

BeCl₂ 80 1·0138 BaCl₂ 208 1·0489

MgCl₂ 95 1·0203