Q46 of 62 Page 72

How will you calculate work done on an ideal gas in a compression, when a change in pressure is carried out in infinite steps?

o When an ideal gas in a compression, where the change in pressure is carried out in infinite steps i.e. through a reversible process, the work done can be calculated only through the observation of pressure vs volume plot of the process.


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The shaded area in the above graph represents the work done in the process, by calculating the area covered we can calculate the work done.


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44

The enthalpy of reaction for the reaction :

2H2(g) + O2(g) → 2H2O(l) is ∆HrΘ = – 572 kJ mol–1


What will be standard enthalpy of formation of H2O (l)?


 45

What will be the work done on an ideal gas enclosed in a cylinder, when it is compressed by constant external pressure, pext in a single step as shown in Fig? 6.2. Explain graphically.




 47

Represent the potential energy/enthalpy change in

the following processes graphically.


(a) Throwing a stone from the ground to roof.


(b) 1/2 H2(g) + 1/2 Cl2(g) ⇋ HCl(g) ΔrHΘ = –92.32 kJ mol–1


In which of the processes potential energy/enthalpy change is contributing factor to the spontaneity?


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Enthalpy diagram for a particular reaction is given in Fig. 6.3. Is it possible to decide the spontaneity of a reaction from the given diagram. Explain.