Sodium carbonate, also called "washing soda," can be made by heating sodium hydrogen carbonate: 2 NaHCO 3 ( l ) → Na 2 CO 3 ( s ) + CO 2 ( g ) + H 2 O ( l ) Δ H ° = + 135.6 kJ ; Δ G ° = + 34.6 kJ at 25°C (a) Calculate Δ S ° for this reaction. Is the sign reasonable? (b) Calculate Δ G ° at 0 K; at 1000 K.
Sodium carbonate, also called "washing soda," can be made by heating sodium hydrogen carbonate: 2 NaHCO 3 ( l ) → Na 2 CO 3 ( s ) + CO 2 ( g ) + H 2 O ( l ) Δ H ° = + 135.6 kJ ; Δ G ° = + 34.6 kJ at 25°C (a) Calculate Δ S ° for this reaction. Is the sign reasonable? (b) Calculate Δ G ° at 0 K; at 1000 K.
Solution Summary: The author explains the value of change in standardentropy for the given reaction at 25°C. It can be calculated from enthalpy and Gibbs free energy.
Check the box under each structure in the table that is an enantiomer of the molecule shown below. If none of them are, check the none of the above box under
the table.
Molecule 1
Molecule 2
Molecule 3
----|||
Molecule 4
Molecule 5
Molecule 6
none of the above
mm..
Use the vapor-liquid equilibrium data at 1.0 atm. for methanol-water (Table 2-8 ) for the following:
If the methanol vapor mole fraction is 0.600, what is the methanol liquid mole fraction?
Is there an azeotrope in the methanol-water system at a pressure of 1.0 atmospheres?
If water liquid mole fraction is 0.350, what is the water vapor mole fraction?
What are the K values of methanol and of water at a methanol mole fraction in the liquid of 0.200?
What is the relative volatility αM-W at a methanol mole fraction in the liquid of 0.200?
Check the box under each structure in the table that is an enantiomer of the molecule shown below. If none of them are, check the none of the above box under
the table.
||
|II*****
Molecule 1
|
Molecule 4
none of the above
Molecule 2
Molecule 3
Х
mm...
C
---|||
***
Molecule 5
Molecule 6
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