Francesconi. Lunelli, and Comelli studied the liquid-vapor equilibria of trichloromethane and l,2-epoxybutane at several temperatures (R. Francesconi, B. Lunelli, and F. Comelli, j. Chern. Eng. Data 41, 310 (1996)). Among their data are the following measurements of the mole fractions of trichloromethane in the liquid phase (xT) and the vapour phase (YT) at 298.15 K as a function of pressure. P(kPa) 23.40 21 .75 20.25 18.75 18.15 20.25 22.50 26.30x 0 0.129 0.228 0.353 0.511 0.700 0.810 1.000y 0 0.065 0.145 0.285 0.535 0.805 0.915 1.000Compute the activity coefficients of both components on the basis of Raoult's law.

when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.

answer; 4 electrons;