A pistion exerting a pressure of `1.0atm` rests on the surface of water at `100^(@)C`. The pressure is reduced to smaller extent and as a result `10g` of `H_(2)O` eveportes and abosrb `20 kJ` fo heat. Determine

Options

A. a) `DeltaH`
B. b) `Latent` `heat` `of` `vapourisation`
C. c) `W`
D. d) `DeltaU`

Explanation

To solve the problem step by step, we need to determine the change in enthalpy (ΔH), the latent heat of vaporization (L), the work done (W), and the change in internal energy (ΔU) when 10 g of water evaporates at 100°C and absorbs 20 kJ of heat.

### Step 1: Calculate ΔH
The problem states that 10 g of water evaporates and absorbs 20 kJ of heat. The change in enthalpy (ΔH) is equal to the heat absorbed during the process.

\[ \Delta H = +20 \, \text{kJ} \]
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