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Question Answer Tutorial - Chemistry->Thermodynamics

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Question: Standard enthalpy of vapourisation DvapHQ for water at 100°C is 40.66 kJmol1. The
internal energy of vapourisation of water at 100°C (in kJmol1) is

(Assume water vapour to behave like an ideal gas)
Answer: +37.56
                        
Question: The enthalpy of fusion of water is 1.435 kcal/mol. The molar entropy change for the melting of ice
at 0°C is
Answer: 5.260 cal/(mol K)
Question: Consider the reaction:

4NO2(g) + O2(g) → 2N2O5(g), ΔrH =
111KJ.

If N2O5(s) is formed instead of N2O5(g) in the above
reaction, the value of ΔrH will be:

(given, ΔH of sublimation for N2O5 is 54 KJ mol1)
Answer: -219 KJ
Question: Based on the first law of thermodynamics, which one of the following is correct?
Answer: For a cyclic process, q=-w
Question: The amount of the heat released when 20 ml 0.5 M NaOH is mixed with 100 ml 0.1 M HCl is y kJ. The
heat of neutralization is ------.
Answer: 100y KJ/mol
                        
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