[Ylide (OP)]

Do any of you know of a good (and free, preferably) place where chemical and physical data is archived?  Something like the CRC Handbook, but online and free.  I did find the NIST Chemistry Webbook, but it doesn't have the information I'm looking for.  (molar heat of vaporization and molar entropy of vaporization for water at conditions OTHER than standard)



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[ruthenium]

You can access Analytical WebBase from http://pubs.rsc.org/CFAA/ [nofollow] for 30 days.
Or, you can try on chemweb.com, there are some FREE databases