The freezing temperature of pure benzene is `5.40^(@)C`. When `1.15g` of naphthalene is dissolved in 100g of benzene, the resulting solution has a freezing point of `4.95^(@)C`. The molal f.p. depression constant for benzene is `5.12`, what is the molecular weight of naphthalene?

Explanation

To find the molecular weight of naphthalene based on the given data, we will follow these steps:

### Step 1: Calculate the depression in freezing point (ΔTf)
The depression in freezing point (ΔTf) can be calculated using the formula:
\[ \Delta T_f = T_f^0 - T_f \]
Where:
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