Lead storage battery contains 38 % by weight solution of H _ 2 SO _...

The depression in freezing point of the solution can be written as follows,

${\Delta T}_{f} = i \cdot {K}_{f} \cdot m$

molality (m) = \dfrac{w / w %}{Molarmassofsolute} \times \dfrac{1000}{massofsolventingrams}

$⇒ {\Delta T}_{f} = 2 . 67 \times 1 . 8 \times \dfrac{38}{98} \times \dfrac{1000}{62}$

$⇒ {\Delta T}_{f} = 30 . 05$

$∴$ Freezing point of solution at which battery freeze$= 243K$