One kilogram water at `0^(@)C` is brought into contact with a heat reservoir at `100^(@)C`. Find

Options

A. The change in entropy when temperature reaches to `100^(@)C`.
B. What is the change in entropy of reservoir?
C. Change in the entropy of universe.
D. The nature of process.

Explanation

To solve the problem of finding the change in entropy when 1 kg of water at \(0^\circ C\) is brought into contact with a heat reservoir at \(100^\circ C\), we will follow these steps:

### Step 1: Calculate the number of moles of water
The molecular weight of water (H₂O) is approximately 18 g/mol. Since we have 1 kg (1000 g) of water, we can calculate the number of moles (n) as follows:

\[ n = \frac{\text{mass}}{\text{molecular weight}} = \frac{1000 \, \text{g}}{18 \, \text{g/mol}} \approx 55.56 \, \text{mol} \]
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