| | | | | | Question Answer Tutorial - Chemistry->Thermodynamics | | | | | | Question: Standard enthalpy of vapourisation DvapHQ for water at 100°C is 40.66 kJmol–1. The
internal energy of vapourisation of water at 100°C (in kJmol–1) 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 mol–1)
| | | 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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