Question:

At atmospheric pressure, 1 g of water has a volume of 1671 cm³ in vapor phase. The change in internal energy when 1 g of water changes from liquid to vapor phase at atmospheric pressure is

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For phase change problems, the change in internal energy is equal to the latent heat times the mass of the substance.
Updated On: May 9, 2025
  • 2256 J
  • 167 J
  • 2423 J
  • 2089 J
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The Correct Option is A

Solution and Explanation

The latent heat of vaporization of water is given as \( 2256 \times 10^3 \, \text{J/kg} \). To find the internal energy change for 1 g of water: \[ Q = 2256 \times 10^3 \times \frac{1}{1000} = 2256 \, \text{J} \]
Thus, the change in internal energy is 2256 J.
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