4. At 300 K, the partial vapor pressures of HCl (that is, the partial pressure of the HCl vapor) in liquid GeCl4 are as follows:
xHCl 0.005 0.012 0.019
pHCl/kPa 32.0 76.9 121.8
Show that the solution obeys Henry’s law in this range of mole fractions, and calculate Henry’s law constant at 300 K.