Answer:
The work is  
       
 The energy  change of the reaction is   
  
Explanation:
From the question we are told that 
     The chemical equation for this reaction is 
              
      The mass of   is
 is  
       The enthalpy  is
 is   this also the change in energy in terms of heat
 this also the change in energy in terms of heat 
       The pressure at which it is oxidized is 
The  no of moles of  used in this reaction is mathematically represented as
used in this reaction is mathematically represented as 
         
The molar mass of  is  a constant with a value
 is  a constant with a value  
    Now substituting values
              
             
 From the reaction we see that 
Two mole of  reacts with One mole of
  reacts with One mole of  to give Four moles of
 to give Four moles of  
This means that 
One mole of   reacts with 0.5 mole of
  reacts with 0.5 mole of  to give two moles of
 to give two moles of  
it also implies that 
 of
 of   reacts with
  reacts with  moles of
 moles of  to give
 to give  moles of
 moles of  
so 
 of
 of   reacts with
  reacts with  moles of
 moles of  to give
 to give  moles of
 moles of  
Now the number of moles of gaseous reactant is 
       
The number of moles of gaseous product  is 
      
So the change in number of moles for gaseous  compounds is mathematically evaluated as 
          
         
Now the workdone for  the compound  is mathematically represented as
 is mathematically represented as 
         
Where R is the gas constant with a value of 
             T is the temperature with a value  
      Substituting values 
      
      
Generally the internal energy change of the reaction can be represented as
            
Substituting value 
         
          
  
This is the internal energy change on the reaction for 42.60 g of 