Ethylene glycol `(HOH_2C-CH_2OH)` is used as an antifreeze for water to be used in car radiators in cold places. How much ethylene glycol should be added to 1 kg of water to prevent it from freezing at `-10^@C`? Molal depression constant of water is 1.86 K kg `mol^(-1)`.

Explanation

To solve the question of how much ethylene glycol should be added to 1 kg of water to prevent it from freezing at -10°C, we will follow these steps:

### Step 1: Understand the Freezing Point Depression
The freezing point of pure water is 0°C. To prevent it from freezing at -10°C, we need to lower the freezing point by 10°C.

### Step 2: Use the Freezing Point Depression Formula
The formula for freezing point depression is given by:
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