Use the information below to calculate the change in enthalpy and the change irn

Question

Use the information below to calculate the change in enthalpy and the change irn entropy for the reaction A B PROBLEM Enthalpy (kJ mol) Entropy J K mol) 60 75 97 SOLUTION = 75 kj-mol-1-60 kj-mol-1 = 15 kj-mol = 15,000/mol-1 = 97 J-K-"mol-i -1 22J.K.mol1 75J-K-i.mol-i 1. The change in enthalpy for a reaction is 8 kJ-mol-1. Is heat absorbed or given PRACTICE PROBLEMS off during the reaction? 2. A reacting system undergoes a change from ordered to disordered. Is the entropy change positive or negative?

Explanation / Answer

1) as enthalpy change is positive value reaction is endothermic.

means heat will absorb.

2) if ordered state cjanges to disordered state entropy will increases.

change in entropy will be positive.

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