Acopper ore containing 4.3 wt% water, 10.3 wt% cuso, and 85.3 wt% rock is fed to a staged counter current extractor at a rate of 11.7 tons per hour. we wish to recover 98% of the copper sulfate using pure water as the fresh solvent. the solution produced is to be 10 wt% copper sulfate and 90 wt% water. if after each stage 1 ton of inert rock retains 2 tons of water plus the dissolved copper sulfate, how many stages are required?

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