NEETChemistryThermodynamics (C)
For the condensation of steam to liquid water at 100^ C , H ₂ O ( g ) H ₂ O ( l ) , the correct signs for the changes in enthalpy ( H ) and entropy ( S ) are:
Options
- AH > 0 and S > 0
- BH 0
- CH > 0 and S < 0
- DH < 0 and S < 0
Correct answer
D. H < 0 and S < 0
Step-by-step solution
During the condensation of steam to liquid water, heat is released to the surroundings as the latent heat of condensation. Therefore, the physical process is exothermic and H The transition from a highly disordered gaseous state to a more ordered liquid state restricts the random movement of molecules, leading to a decrease in randomness. Hence, the entropy decreases, meaning S Answer: H < 0 and S < 0