When 1 g each of compounds AB and AB_2 are dissolved in 15 g of water separately, they increased the boiling point of water by 2.7 K and 1.5 K…

When $\displaystyle 1$ g each of compounds AB and $\displaystyle \mathrm{AB}_2$ are dissolved in $\displaystyle 15$ g of water separately, they increased the boiling point of water by $\displaystyle 2.7$ K and $\displaystyle 1.5$ K respectively. The atomic mass of A (in amu) is $\displaystyle \_\_\_\_$ $\displaystyle \times 10^{-1}$ (Nearest integer) (Given : Molal boiling point elevation constant is $\displaystyle 0.5 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$ )