Answer the following questions and explain briefly (in no more than three senten

Question

Answer the following questions and explain briefly (in no more than three sentences):

a. Does the addition of an inert diluent to the reactants entering an exothermic process increase, decrease, or make no change in the heat transfer to or from the process?

b. If the reaction in a process is incomplete, what is the effect on the value of the standard heat of reaction? Does it go up, go down, or remain the same?

c. Consider the reaction H2 (g) + 12 O2 (g) H2O (g). Is the heat of reaction with the reactants entering and the products leaving at 500 K higher, lower, or the same as the standard heat of reaction?

Explanation / Answer

1. Since the reaction is exothermic, during the course of reaction temperature increases and some of the heat is also taken be inerts and this helps in controlling the heat transfeer better and better control of reactor temperature

2. Heat of reaction is expressed in terms of J/mole. Since the process is incomplte, the number of moles reacted will be less and heat liberted or absorbed is less. However, standard heat of reaction expressed in j/mole remain constant

3.

where the second term on RHS indicates the change in speciific heat of     reactants and products. Since both reactats and products are increased to same temperature , the difference in speciifc heat is -ve because there are more number of moels on the reactant side making the second term negative and leading to reduction in heat of     reaction compared to standard heat of reaction.

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