A series of chemical problems with key for use in colleges and schools / by T.E. Thorpe. Rev. and enl. by W. Tate ; with a preface by H.E. Roscoe.

  • Thomas Edward Thorpe
Date:
1891
Catalogue details

Licence: Public Domain Mark

Credit: A series of chemical problems with key for use in colleges and schools / by T.E. Thorpe. Rev. and enl. by W. Tate ; with a preface by H.E. Roscoe. Source: Wellcome Collection.

    33/160 (page 21)
    Or II. The weighing of a known volume of the vapour taken at an ascertained temperature and pressure -the methods of Dumas, and Deville and Troost. If D = the recpiired densit)- of the vapour referred to // as unity, we have in case I. A. w . 760 . (i + 0-00367 T) ~ V . 0-00008958 . (// - //) . (i -|- kTy w = weiglit of liquid taken, and hence weight of vapour formed. V = observed \ olume of vapour in c.c. // = reduced height of bar. at time of experiment. h = reduced height of mercury in tube above that in cistern. T = temperature of \ apour. k = coefficient of cubical expansion of glass for 1° C. And in case I. B. . 760 . (i 4- 0-00367 T) V . 0-00008958 . (// - p) ’ 70 = weight of liquid taken. V — the observed volume of displaced gas in c.c. H = reduced height of bar. at time of ex])criment. p = vapour tension of water at lem])cralure t of measuring vessel. y = temperature of water in collecting trough. The methods under 4. II. for determining \apour density and under 3. 1. for finding the rel. dens, of a gas require the following data ;— /’ = the weight of bulb in air empty. B' = the weight of bull) filled with air. B = the capacity of l)ulb in c.c. V the volume of the residual air in c.c. gas or vapour in