STD 11 - 3. Classification of elements and periodicity in properties — NEET STD 11 Science — Question

Given : $\Delta H _{ f }^{\ominus}\left( Al _2 O _3\right)=-1700\,kJ\,mol ^{-1}$

$\Delta H _{ f }^\theta\left( Fe _2 O _3\right)=-840\,kJ\,mol ^{-1}$

Molar mass of $Fe , Al$ and $O$ are $56,27$ and $16\,g\,mol ^{-1}$ respectively.

(Assume : Densities of the solutions $A$ and $B$ are the same as that of water and the soluble salts dissociate completely.)

Use: Molal elevation constant (Ebullioscopic Constant), $K _{ b }=0.5 K kg mol ^{-1}$; Boiling point of pure water as $100^{\circ} C$.)

($1$) The value of $x$ is

($2$) The value of $|y|$ is