00:01
Hi now we will discuss about the what are the thermodynamic quantities which will affect the internal energy of the system we know that for a closed system the first law of thermodynamics use the expression for the change in internal energy change in internal energy is the change in thermal energy from first law of thermodynamics we can write the equation for the change in internal energy d u is equal to u plus w where q is the amount of heat but the closed system we can write q as the tds minus work done by the system that is pressure volume work which is replaced by p tb change in volume you will observe so p tv so temperature pressure here we can see that temperature pressure volume and endrope all these factors will influence the amount and sign of they will influence the amount and sign of whether it is positive sign or negative sign of internal energy sign of internal energy change of a system among this entropy is the thermodynamic quantity thermodynamic quantity is entropy remaining all are the variables now we have given a reaction that nh4 no3 solid upon dissolution gives rise to nh4 plus aqueous and o3 minus iqs their delta h for this reaction is 28 .05 kilojoult per more this is a dissolution reaction and we know that a dissolution reactions are endothermic in nature this is the system and the system will absorb energy from the surrounding so here the value is given plus as a it is endothermic reaction.
02:36
So system will absorb heat energy from surrounding.
02:49
Here they are asking that what is the change in surrounding by this reaction? so we can say that delta t surroundings will decrease because the system will absorb the energy.
03:02
Delta t surrounding decreases surrounding temperature decreases.
03:15
Now we will discuss about delta h0 for the formation of 1 mole of icl gases from the given data.
03:23
Here let us consider these as the equations 1, 2, 3.
03:32
Now first we will write the target equation for the formation of icl.
03:37
Icl is formed from half i2 solid, half cl to gas, use rise to icl gas.
03:52
This is the target equation for the formation of 1 mole of icl.
03:57
Now by using these equations we have to find the delta h0 for the formation of 1 mole of icl...