JEE Main 2017 Chemistry question
The enthalpy change on freezing of mol of water at C to ice at C is: (Given kJ mol at C, J mol K, J mol K)
Answer: (4)
Solution
Enthalpy is a state function, so construct a three-step path through the known transition at C. **Step 1 — cool the liquid from C to C:**
Δ = 75.3×(0-5) = -376.5\ J.
**Step 2 — freeze at C:** freezing is the reverse of fusion, so
Δ = -6000\ J.
**Step
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