How much ethyl alcohol must be added to 1.0 L of water so that solution will not freeze at $- 4^{\circ} F ? (K_{f} = {1.86}^{\circ} C / m)$

see full answer

Start JEE / NEET / Foundation preparation at rupees 99/day !!

21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!

An Intiative by Sri Chaitanya

<20 g

< 10.75 g

< 494.5 g

> 494.5 g

answer is D.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

$\begin{array}{l} - 4^{\circ} F = - 20^{\circ} C; ∴ {ΔT}_{f} = 20^{\circ} C \\ {ΔT}_{f} = k_{f} \cdot m \cdot \Rightarrow m = \frac{20}{1 .86} = 10 .75 \end{array}$
mass of C₂H₅OH required
$\Rightarrow 10.75 x 46 \Rightarrow 494.5 g$

Watch 3-min video & get full concept clarity

tricks from toppers of Infinity Learn

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Books for IIT JEE

Best Books for NEET

🔥 Start Your JEE/NEET Prep at Just ₹1999 / month - Limited Offer! Check Now!

Get Expert Academic Guidance – Connect with a Counselor Today!