$\mathrm{Ca}{\left(\mathrm{OH}\right)}_{2\left(\mathrm{dry}\right)}\underset{{\mathrm{H}}_2\mathrm{O}}{\overset{{\mathrm{Cl}}_2}{\to }}\mathrm{A}\stackrel{\mathrm{auto}\mathrm{oxidation}}{\to }{\mathrm{CaCl}}_2+\mathrm{B}$. What is the difference between molar masses of B and A?

$\mathrm{Ca}{\left(\mathrm{OH}\right)}_{2\left(\mathrm{dry}\right)}\underset{{\mathrm{H}}_2\mathrm{O}}{\overset{{\mathrm{Cl}}_2}{\to }}\mathrm{CaOC}{\mathrm{l}}_2\stackrel{\mathrm{auto}\mathrm{oxidation}}{\to }{\mathrm{CaCl}}_2+\mathrm{Ca}{\left(\mathrm{ClO}\right)}_2$ 

Molar mass of B = 143

Molar mass of A = 127

Difference = 143 - 127 = 16