Workshop #3 Key

Workshop #3 Key - Names_ Everybody in your group must sign...

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Names____________________________________________________________ Everybody in your group must sign their own name. Chem. 104LC Workshop 3 (20 points) Summer 2010 1. (3pts) Using thermodynamic data, estimate the vapor pressure of water at 298 K. H 2 O(l) ↔ H 2 O(g), K = P H2O , the vapor pressure. Go = 8 kJ/mol = -RT ln K K = 0.040 PH 2 O = 0.040 atm 2. (5pts) We have talked about HNO 3 (aq) as a strong acid, but in reality the Ka for this acid is not very large. Historically it has been thought of as a strong acid because the nitrate ion is a strong oxidant, allowing the acid to dissolve metals like copper that concentrated HCl does not. Standard Thermodynamic data for 298K HNO 3 (aq) NO 3 - (aq) H + (aq) G o f -111.25kJ -110.2kJ 0.0kJ H o f -207.36kJ -206.85kJ 0.0kJ a)What is the Ka for HNO 3 (aq) at 298K? G o = 1.05 kJ/mol = -RT ln K, K = 0.65 b) Would you expect hot HNO 3 (aq) to be a stronger or weaker acid than at room temperature? Explain. Think about the exo or endo process.
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This note was uploaded on 10/27/2010 for the course CHEM 104 taught by Professor Quigley during the Summer '08 term at CUNY Hunter.

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Workshop #3 Key - Names_ Everybody in your group must sign...

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