Water is added to the solution M such that the mole fraction of water in the solution becomes 0.9. The boiling point of this solution is

Question

Water is added to the solution M such that the mole fraction of water in the solution becomes 0.9. The boiling point of this solution is (A) 380.4 K (B) 376.2 K (C) 375.5 K (D) 354.7 K

Tardigrade Admin · Accepted Answer

Now ethanol is solute. Molality of solute =(0.1/0.9 × 18) × 1000 =6.17 ⇒ Δ Tb =6.17 × 0.52 = 3.20 ⇒ Tb =373+3.2 =376.2 K

Q. Water is added to the solution $M$ such that the mole fraction
of water in the solution becomes $0.9$ . The boiling point of this solution is

380.4 K

376.2 K

375.5 K

354.7 K

Now ethanol is solute.
Molality of solute = $\frac{0.1}{0.9 \times 18} \times 1000 = 6.17$
$\Rightarrow Δ T_{b} = 6.17 \times 0.52 = 3.20$
$\Rightarrow T_{b} = 373 + 3.2 = 376.2 K$

Q. Water is added to the solution M such that the mole fraction of water in the solution becomes 0.9. The boiling point of this solution is