3. Both of NaOH and Al(OH)3 are solid at room temperature. However, NaOH is soluble in water while Al(OH)3 is insoluble. Please explain this difference in terms of lattice energies.

4. A balloon is becoming its full extent after heating the air inside. In the final stage of this process the volume of the balloon changes from 4.0 x 108 L to 4.5 x 108 L by addition of 1.3 x 104 J of the energy as heat.Assuming the balloon expand against a constant pressure of 1.0 atm, please calculate \( \Delta E \) for the process.

3. Both of NaOH and Al(OH)₃ are solid at room temperature. However, NaOH is soluble in water while Al(OH)₃ is insoluble. Please explain this difference in terms of lattice energies.

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