(a)
Interpretation:
The entropy changes associated with the phase transitions of sodium has to be found.
Concept Introduction:
Entropy is a
Where,
(a)
Answer to Problem 7PPB
Solution:
The entropy changes associated with the solid-liquid transitions
The enthalpy changes associated with the solid-liquid transitions
The melting point of sodium is found to be
Explanation of Solution
Given,
To calculate
To calculate
To calculate melting point of
The melting point of
The temperature in Kelvin is converted into degree Celsius by subtracting the value of
The entropy changes associated with the phase transitions of sodium was found.
(b)
Interpretation:
The entropy changes associated with the phase transitions of sodium has to be found.
Concept Introduction:
Entropy is a thermodynamic quantity, which is the measure of randomness in a system. The term entropy is useful in explaining the spontaneity of a process. For all spontaneous process in an isolated system there will be an increase in entropy. Entropy is represented by the letter ‘S’. It is a state function. The change in entropy gives information about the magnitude and direction of a process. The entropy changes associated with a phase transition reaction can be found by the following equation.
Where,
(b)
Answer to Problem 7PPB
The entropy changes associated with the liquid-vapour transitions
The enthalpy changes associated with the liquid-vapour transitions
The boiling point of sodium is found to be
Explanation of Solution
Given,
To calculate
To calculate
To calculate boiling point of
The boiling point of
The temperature in Kelvin is converted into degree Celsius by subtracting the value of
The entropy changes associated with the phase transitions of sodium was found.
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Chapter 14 Solutions
GEN COMBO CHEMISTRY: ATOMS FIRST; ALEKS 360 2S ACCESS CARD CHEMISTRY:ATOMS FIRST
- The Ostwald process for the commercial production of nitric acid involves three steps: 4NH3(g)+5O2(g)825CPt4NO(g)+6H2O(g)2NO(g)+O2(g)2NO2(g)3NO2(g)+H2O(l)2HNO3(l)+NO(g) a. Calculate H, S,G and K (at 298 K) for each of the three steps in the Ostwald process (see Appendix 4). b. Calculate the equilibrium constant for the first step at 825C, assuming H and S do not depend on temperature. c. Is there a thermodynamic reason for the high temperature in the first step, assuming standard conditions?arrow_forwardConsider the reaction: H2S(g)+SO2(g)3S(g)+2H2O(l) for which H is 233 kJ and S is 424 J/K. a. Calculate the free energy change for the reaction (G) at 393 K. b. Assuming H and S do not depend on temperature, at what temperatures is this reaction spontaneous?arrow_forwardHydrogen sulfide can be removed from natural gas by the reaction 2H2S(g)+SO2(g)3S(s)+2H2O(g) Calculate G and K (at 298 K) for this reaction. Would this reaction be favored at a high or low temperature?arrow_forward
- What is the sign of the standard Gibbs free-energy change at low temperatures and at high temperatures for the explosive decomposition of TNT? Use your knowledge of TNT and the chemical equation, particularly the phases, to answer this question. (Thermodynamic data for TNT are not in Appendix G.) 2C7H5N3O6(s) 3N2(g) + 5H2O() + 7C(s) + 7CO(g)arrow_forwardFrom the values for G f given in Appendix 1, calculate G at 25C for each of the reactions in Question 19.arrow_forwardCalculate H and G for the following reactions at 25C, using thermodynamic data from Appendix C; interpret the signs of H and G. a Al2O3(s)+2Fe(s)Fe2O3(s)+2Al(s) b COCl2(g)+H2O(l)CO2(g)+2HCl(g)arrow_forward
- Thermite reactions have been used for welding metal parts such as railway rails and in metal refining. One such thermite reaction is Fe2O3(s)+2Al(s)Al2O3(s)+2Fe(s). Is the reaction spontaneous at room temperature under standard conditions? During the reaction, the surroundings absorb 851.8 kJ/mol of heat.arrow_forwardGiven: P4(s)+5O2(g)P4O10(s)G298=2697.0kJ/mol 2H2(g)+O2(g)2H2O(g)G298=457.18kJ/mol 6H2O(g)+P4O10(s)4H3PO4(l)G298=428.66kJ/mol (a) Determine the standard free energy of formation, Gf, for phosphoric acid. (b) How does your calculated result compare to the value in Appendix G? Explain.arrow_forwardWhat information can be determined from G for a reaction? Does one get the same information from G, the standard free energy change? G allows determination of the equilibrium constant K for a reaction. How? How can one estimate the value of K at temperatures other than 25C for a reaction? How can one estimate the temperature where K = 1 for a reaction? Do all reactions have a specific temperature where K = 1?arrow_forward
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