1. Tardigrade
  2. Question
  3. Chemistry
  4. Assertion: The increase in internal encrgy (Δ E) for the vapourization of one mole of water at 1 atm and 373 K is zero. Reason: For all isothermal processes, Δ E = 0 .

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Q. Assertion : The increase in internal encrgy $(\Delta E)$ for the vapourization of one mole of water at $1$ atm and $373\, K$ is zero. Reason : For all isothermal processes, $\Delta E = 0 .$

AIIMSAIIMS 2003Thermodynamics

Solution:

At $373 \,K$ or $100^{\circ} $C, the water starts boiling and at this temperature the vaporization of water is an isothermal process.
The internal energy change ($\Delta E$), depend only on temperature, it follows that at constant temperature, the internal energy of the gas remains constant, i.e. $\Delta E$ is zero.