00:01
Hello students a equation a reaction is given in the question which says that is p b in solid state when reacted with cl2 that is chloride in gaseous state gives rise to pb cl2 that is let chloride in solid state we have to predict if delta s is going to be that is the change in entropy is going to be positive negative or it may be zero so we have to find out this in the question first understand entropy.
00:27
Entropy basically means entropy basically means distortion and it depends on the state of the compound.
00:35
For example, a solid compound will have less entropy whereas a liquid compound.
00:41
See, this is the liquid compound.
00:43
Liquid compound is going to have more entropy than solid and gases compounds.
00:47
We all know that gases occupy large amount of space and they are widespread and therefore their entropy will be much higher than any of the compounds like.
00:55
Gases, liquids or aqua solutions.
00:58
So the entropy we can write it as the entropy of solid is less than that of liquid which is less than of aquaic solutions which is much less than that of gaseous molecules.
01:12
So gases will have a lot of entropy the highest entropy is of gases.
01:17
Supposedly if a gas is forming in a compound suppose there is a compound a which was solid and this gives right to the product b, which is in gaseous state.
01:27
So the entropy, entropy is going to be much higher, that is, it is going to be positive or we can also say that the entropy is going to be more than zero because gas is forming and the entropy of gas is much higher.
01:40
Now supposedly in a similar manner, supposedly that a was in gaseous state and it gives rise to a solid molecule.
01:47
And in this case, since gas is losing and therefore the entropy is going to decrease.
01:53
So the entropy will be negative or it is can be also said that it is less than zero.
01:59
Let's example further...