Based upon the valence electrons taken from the periodic table, the formula for rubidium (rb) chlorine (cl) is:

RbCl  

Step-by-step explanation:

Rb is in Group 1. It can lose one electron to get a complete shell.

Cl is in Group 17. It can get a complete shell by gaining one election.

Thus, one Rb atom can react with one Cl atom.

The formula of rubidium chloride is RbCl.

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