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Shane Macguire Grade: upto college level
`        Calculate the increase in the internal energy of 10 g of water when it is heated from 0°C to 100°C and converted into steam at 100 kPa. The density of steam = 0.6 kg/m3. Specific heat capacity of water = 4200 J/kg-C and the latent heat of vaporization of water = 2.25 × 106 J/kg.`
3 years ago

Deepak Patra
474 Points
```										Sol. Mass = 10g = 0.01kg.
P = 10^5Pa
dQ = Q base h2o 0° + Q base H2o – steam
= 0.01 × 4200 × 100 + 0.01 × 2.5 × 10^6 = 4200 + 25000 = 29200
dW = P × ∆V
∆ = 0.01/0.6 – 0.01/1000 = 0.01699
dW = P∆V = 0.01699 × 10^5 1699J
dQ = dW + dU or dU = dQ – dW = 29200 – 1699 = 27501 = 2.75 × 10^4 J

```
3 years ago
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