[JStuart88]

 Any help to these question would be a miracle. Please and Thank You
Question 1    
    ENG S09 006: A reaction (or process) has an enthalpy change of 369.71079kJ/mol and an entropy change of 1,366.28344J/mol•K. At what temperature (K) will the process become spontaneous? Error tolerance: ±0.1K             
    
         
   Question 2    
    ENG S09 019: 1.88119g of zinc (65.38 g/mol) react with acid to yield hydrogen gas. If the pressure is 698.73631torr and the temperature is 186.31607°C, how many mL of hydrogen gas are produced? Use R = 0.08206L•atm/mol•K. Error tolerance: ±1%             
    
         
   Question 3   

    ENG S09 008: Calculate the pH of a solution with a hydrogen ion concentration of 1.77792 × 10-0M. Error tolerance: ±0.001             
    
         
   Question 4     

    ENG S09 016: How many mL of 1.92488M HCl(aq) are needed to completely neutralize 81.15426 mL of 0.55682M barium hydroxide? Answer tolerance: ±0.01 mL             
    
         
   Question 5    
   

    ENG S09 011: During a electrochemical process 3 electrons are passed between the anode and cathode for the balanced equation and Q = 1.83334. Calculate the voltage for this cell at 25°C for E° = 1.72199 volts. Use the constant 0.05915 in the Nernst equation. Error tolerance: ±0.01 volts             
    
         
   Question 6    
    ENG S09 013: For an electrochemical process, E° = 0.13456 volts at 25°C. If 1 electrons are transferred in the reaction, what is the equilibrium constant of the reaction? Use 0.05916 in the Nernst equation. Error tolerance: ±1%             
    
         
   Question 7    
    ENG S09 004: A gas mixture has an average molecular weight of 232.8g/mol. It is composed of two gases with MW's of 455.7 and 33.38 g/mol respectively. What is the mole fraction of the first gas? Error tolerance: ±0.001             
    
         
   Question 8    
    ENG S09 009: A process has a standard enthalpy change of 13.59581kJ/mol and a standard entropy change of 370.21659J/mol•K. Estimate the natural logarithm (ln(K)) of the equilibrium constant at 348.03K. Use R = 8.3144J/mol•K. Error tolerance: ±1%             
    
         
   Question 9       

    ENG S09 002: Convert -160°F to Kelvins. Tolerance: ±0.01K             
    
         
   Question 10    
    ENG S09 015: 3.37473 moles of a substance are confined to a sphere of 7.6914 cm in radius with a density of 3.65936g/mL. What is the molecular weight of the substance (g/mol)? Error tolerance: ±1%            
                  

[sjb]

Any help to these question would be a miracle. Please and Thank You
Question 1    
    ENG S09 006: A reaction (or process) has an enthalpy change of 369.71079kJ/mol and an entropy change of 1,366.28344J/mol•K. At what temperature (K) will the process become spontaneous? Error tolerance: ±0.1K          

What factor determines whether a reaction is spontaneous? - Note that this has a specific meaning in chemistry.

         
   Question 2    
    ENG S09 019: 1.88119g of zinc (65.38 g/mol) react with acid to yield hydrogen gas. If the pressure is 698.73631torr and the temperature is 186.31607°C, how many mL of hydrogen gas are produced? Use R = 0.08206L•atm/mol•K. Error tolerance: ±1%

            
    
First, write a generic equation for the reaction of zinc and acid, then use the ideal gas equation.

   Question 3   

    ENG S09 008: Calculate the pH of a solution with a hydrogen ion concentration of 1.77792 × 10-0M. Error tolerance: ±0.001             

    

What is the definition of pH in terms of concentration?

         
   Question 4     

    ENG S09 016: How many mL of 1.92488M HCl(aq) are needed to completely neutralize 81.15426 mL of 0.55682M barium hydroxide? Answer tolerance: ±0.01 mL             

    

Write a balanced equation for the reaction of HCl and your base.
         

   Question 5    
   

    ENG S09 011: During a electrochemical process 3 electrons are passed between the anode and cathode for the balanced equation and Q = 1.83334. Calculate the voltage for this cell at 25°C for E° = 1.72199 volts. Use the constant 0.05915 in the Nernst equation. Error tolerance: ±0.01 volts             
    
         
   Question 6    
    ENG S09 013: For an electrochemical process, E° = 0.13456 volts at 25°C. If 1 electrons are transferred in the reaction, what is the equilibrium constant of the reaction? Use 0.05916 in the Nernst equation. Error tolerance: ±1%             
    
   Question 7    
    ENG S09 004: A gas mixture has an average molecular weight of 232.8g/mol. It is composed of two gases with MW's of 455.7 and 33.38 g/mol respectively. What is the mole fraction of the first gas? Error tolerance: ±0.001             

This one has been answered (or a very similar one) within the last 24 hours or so, have a look through the forums.
         

Question 8    
    ENG S09 009: A process has a standard enthalpy change of 13.59581kJ/mol and a standard entropy change of 370.21659J/mol•K. Estimate the natural logarithm (ln(K)) of the equilibrium constant at 348.03K. Use R = 8.3144J/mol•K. Error tolerance: ±1%             

What equations do you know that link H, S and K?    
         

Question 9       

    ENG S09 002: Convert -160°F to Kelvins. Tolerance: ±0.01K

Do you know how to convert Fahrenheit into any other measurement of temperature?            
    

         
   Question 10    
    ENG S09 015: 3.37473 moles of a substance are confined to a sphere of 7.6914 cm in radius with a density of 3.65936g/mL. What is the molecular weight of the substance (g/mol)? Error tolerance: ±1%

What's the volume of the sphere?

[Borek]

Any help to these question would be a miracle.

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