If the freezing point of a 0.01 molal aqueous solution of a cobalt(III) chloride-ammonia complex (which behaves as a strong electrolyte) is $-0.0558^{\circ} \mathrm{C}$, the number of chloride(s) in the coordination sphere of the complex is $\left[\mathrm{K}_{\mathrm{f}}\right.$ of water $\left.=1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}\right]$