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.

    42/160 (page 30)
    74. A determination of the density of metliyl bromide made by Bunsen r.ccording to Ids method yielded the following- data. Calculate' the relative density of the compound {II = i). \'ol. of gas, at 0-7464 m. and i6-8’ C. . . 42-19 c.c. Height of mercury above the level of the metal in trough 0-0243 m. Weight of the flask and gas 7-9465 grams. Weight of the flask and air 7’8397 „ Tcm|icrature in balance case 6-2 C. Height of barometer 0-7421 m. 75. Bunsen determined the times of effusion through a minute ajicrture of the same volume of gases as follows : — Air. Hydroi^c/t. (1) 105-5 ' 29-7 (2) 105-6 29-3 Air. Oxygen. 102-5 >08-5 103 109 Carbon Air. dioxide, 102-7 127-0. 102-7 127-5. Find the rol. dens, of each gas compared with air. 76, 'fhe data below were obtained in three determina- tions of the \-apour density of according to Hofmann’s method ; calculate the V.D. in each case, (A) Air = i. (B) //= 1. i. 11. til. Weight of substance taken 'I'emjjeratiire of lube and o'i887 grams. ()'i887 grams 0*1887 grams vapour 132 C. '59° C. i8^ C. 'J'einperature of air . 20*^ C. 7.0° ( k 20' c. Ranjineler 770 mm. 769 mm. 1 769 mm. J leiglit of mcrcur)” column 625 mm. 616 mm. j mm. Volume of vapour at T (J. 'I’ension of mercury at 137-5 ‘-■•c. 139*6 c.c. T C T‘5 mm. 5*6 mm. 12 mm. 77. A series of experiments by Ramsay and Young, under varx ing conditions, yielded the followingdata, from which the \ a])om--dcnsity of acetic arid is to be lound in each case (Hofmann’s method). (7/ = 1).