How much amount of NaCl in g should be added to900 g of water `( rho =1.00 g//mL` ) to decrease the freeezing point of water to `-0.3^(@)C` `"___________"` . ( The freezing point depression constant for water `= 3K kg mol^(-1)` Atomic mass `: ` H =1 , O =16,Na = 23 , Cl = 35.5 )

Explanation

To solve the problem of how much NaCl should be added to 900 g of water to decrease the freezing point to -0.3°C, we will follow these steps:

### Step 1: Understand the Freezing Point Depression Formula
The freezing point depression can be calculated using the formula:
\[ \Delta T_f = i \cdot K_f \cdot m \]
where:
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