00:01
Hello students, in this question we have to write the reaction series in which nh4cl changes to nh3 gas plus hcl gas.
00:16
We have to write the series of reaction.
00:19
So first of all, nh4 cl solid changes to nh4 cl aquas.
00:31
Then this aquas solution of nh4cl breaks into nh3 aquas, that is ammonia aquas, plus hcl is also present in aquas phase.
00:47
Then this aquas nh3 is converted into the nh3 gase phase and hcl aquas is converted to the hcl gase phase.
01:02
So these are the series in which the reaction proceeds.
01:08
In which reaction proceed.
01:14
So this is answer of part a.
01:16
Now we have to find the enthalpies.
01:19
To find the enthalpies, apply hass's law.
01:29
To apply the hesl, we first write all the reactions that is taking place, that is hcl in aqueous phase plus nh3 in aquas phase gives out an h4cl in equest phase.
01:52
Delta h for this reaction is plus 14 .86 kilojoules per mole.
02:01
Now second reaction is nh4 cl solid convert into a to the nh4 cl in aquas.
02:12
For this delta h is equal to minus 14 .7 kilojoule per mole.
02:21
Next reaction is nh3 gas gives out nh3 in aquas phase and delta h for this reaction is minus 34 .64 kilojoule per mole.
02:40
Now the next reaction is hcl in gases phase, gifts out hl in aquas phase.
02:49
So the delta h for this is 75 .1 for kg per mole.
02:58
As these reactions or the hl is given, delta h is given, so now now we can say that nh4 cl in aquas phase gives out hcl in aquas plus nh3 in aquas.
03:22
We write according to our series so that we got the final reaction...