Each of the following processes is spontaneous as described. Which one will have ∆H approximately equal to zero?

Question

1. precipitating 1 mol of AgBr(s) from a
solution of Ag+(aq) and Br−(aq)

2. 1 L He(1 atm, 298 K) + 1 L Ar(1 atm,
298 K) → 2 L He/Ar mixture(1 atm, 298 K)

3. freezing 1 mol of water at − 10◦C

4. evaporating 1 mol of water at 100◦C and 1 atm

Answer 1

2. 1 L He(1 atm, 298 K) + 1 L Ar(1 atm, 298 K) → 2 L He/Ar mixture(1 atm, 298 K)