Standard vaporization enthalpy of benzene at its boiling point is `30.8 kJ mol^(-1)`, for how long would a `100W` electric heater have to operate in order to vaporize a `100g` sample of benzene at its boiling temperature?

Explanation

To solve the problem of how long a 100W electric heater needs to operate to vaporize a 100g sample of benzene, we can follow these steps:

### Step 1: Determine the number of moles of benzene
The molecular weight of benzene (C₆H₆) is approximately 78 g/mol. To find the number of moles in 100g of benzene, we use the formula:

\[ \text{Number of moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}} \]
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