July 5, 1966 - Linus Pauling Day-by-Day

Check from AHP to Channel Disposal co., RE: $4.20. [Filed under LP Biographical: Financial, Box 4.029, Folder 29.1]

Check from AHP to El Camino Pharmacy, RE: $73.57. [Filed under LP Biographical: Financial, Box 4.029, Folder 29.1]

Check from AHP to Hessellund Nursery, RE: $15.10. [Filed under LP Biographical: Financial, Box 4.029, Folder 29.1]

Check from AHP to Jean Colon, RE: $7.88. [Filed under LP Biographical: Financial, Box 4.029, Folder 29.1]

Check from AHP to S.C.A.H.U.A.C., RE: $25.00. [Filed under LP Biographical: Financial, Box 4.029, Folder 29.1]

Check from AHP to Standard Oil, RE: $23.55. [Filed under LP Biographical: Financial, Box 4.029, Folder 29.1]

Check from AHP to Texaco, RE: $5.40. [Filed under LP Biographical: Financial, Box 4.029, Folder 29.1]

Check from AHP to Western Union, RE: $1.90. [Filed under LP Biographical: Financial, Box 4.029, Folder 29.1]

Copy sent to Dr. Gus Albrecht.” [Filed under LP Science: (Materials re: The Structure of Crystals, 1925-1992), Box #1.001, Folder #1.23]

Letter from G.A. Geach, Professor, The University of Western Ontario, to LP RE: Invites him to lecture in Ontario. Discusses the tentative plans for the lectures. [Letter from LP to Geach July 16, 1966] [Filed under LP Correspondence: G: Correspondence, 1966: Box #143, Folder #143.1]

Letter from J. R. Aitken, Secretary, Research Branch Seminar Committee, to LP RE: Asks if he would consider an delivering a seminar on a topic of his choice to the Research Branch of the Canada Department of Agriculture in Ottawa, Canada. [Letter from LP to Aitken July 19, 1966][Filed under LP Correspondence: A: Correspondence, 1966: Box #15, Folder #15.1]

Letter from LP [Signed by F. K. Givens, Secretary to LP] to Gustav Albrecht RE: Notices that there is a new set of values of nuclear masses and a table of reaction energies. Asks for copies of the references. [Filed under LP Correspondence: A: Individual Correspondence (Albrecht, Gustav): Box #4, Folder #4.2]

Letter from LP to Robert Eramo. [Letter from Eramo to LP June 23, 1966][Filed under LP Correspondence: E: Correspondence, 1966: Box #113, Folder #113.7]

Mr. Robert Eramo

3113 Avenue L

Brooklyn, New York

Dear Mr. Eramo:

I am pleased to answer the questions in your letter of 23 June.

It is necessary to be careful in applying the Principle of LeChatelier. The example that you give in your letter is not a difficult one.

In my book College Chemistry (3rd Edition, 1960) the principle is stated on page 442 as follows: If the conditions of a system, initially at equilibrium, are changed, the equilibrium will shift in such a direction as to tend to restore the original conditions.

The example that you mention is equilibrium between water vapor, hydrogen, and oxygen, in a container at constant volume. You say that if you add heat to the system the reaction will occur in such a direction as to dissociate some of the water molecules and produce hydrogen and oxygen. This answer is the correct one. Some heat was added to the system, and, in accordance with the statement of the principle given above, the equilibrium shifts in such a direction as to tend to restore the original conditions. Since the addition increases the temperature, the reaction occurs in such a way as to tend to decrease the temperature, which means converting some water vapor into hydrogen and oxygen.

You give another argument in your letter, about change in pressure. This argument is not a proper one, because your change in the conditions of the system was not a change in the pressure (as might have been achieved by decreasing the volume), but instead an increase in the temperature, achieved by adding heat to the system.

There is some discussion of this matter on page 599 of my book College Chemistry.

Sincerely yours,

Linus Pauling

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