How much amount of NaCl should be added to 600 g fo water `(varphi =1.00 g//mL)` to decrease freezing point of water to `-0.2^(@)C`? ___________________. (The freezing point depression constant for water `=2K kg "mol"^(-1)`)

Explanation

To solve the problem of how much NaCl should be added to 600 g of water to decrease the freezing point to -0.2°C, we can follow these steps:

### Step 1: Identify the known values
- Mass of water (solvent) = 600 g
- Freezing point depression (ΔTf) = 0.2°C (since the normal freezing point of water is 0°C)
- Freezing point depression constant (Kf) for water = 2 K kg/mol
- Van't Hoff factor (i) for NaCl = 2 (since NaCl dissociates into Na⁺ and Cl⁻)

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