The book Historical Introduction to Chemistry Microform was written by author T Martin Thomas Martin Lowry Here you can read free online of Historical Introduction to Chemistry Microform book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Historical Introduction to Chemistry Microform a good or bad book?
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The conclusions of XV THE MOLECULAR THEORY 353 Avogadro and Cannizzaro as to the number of atoms present in the molecules of various gases and vapours have been confirmed in a very striking way by independent physical methods. It is well known that the heat required to raise the temperature of a gas is greater when the gas is allowed to expand than when its volume is kept constant ; the ratio y of the two heat-capacities can be calculated to be 5/3=1-67 for an ideal or "perfect gas. " Experimen...t has shown that this value is rarely attained in the case of elements, and never in the case of compounds, and further that the value of y diminishes as the number of atoms in the molecule increases. Typical values are as follows : Substance. Ratio 7. Hg, He 1-67 H 2, N 2, Oo, CO, HC1, HBr, HI 1-41 V C1 2, Br 2, I. , C1I I -29 to I -32 / C0 2, N 2 0, N0 2 i'3i It will be seen from the table that the value 1*4 is characteristic for the lighter diatomic gases and the figure i '3 for the heavier diatomic and the lighter triatomic gases, whether elementary or compound.
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