The potential energy of a helium dimer, (he2) is given by v=(b/r^13) - (c/r^6).where b= 9.29x10^4 kj angstroms^13 (mol dimer)^-1 and c= 97.7 kj angstroms^6 (mol dimer)^-1.
a)calculate the equilibrium distance between the he atoms. b)calculate the binding energy of the dimer. c)would you expect the dimer to be stable at room temperature (300k)

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg

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