Second law of thermodynamics - Thermodynamics Video Lecture - Class 11 | Best Video for Class 11

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thermodynamics part 24 is brought to you
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sure that you have watched part 1 part
23 summer I say that the in talking of
the system is always always increase
that's what second normal mixes take
some examples the skins for example this
is my bus so in this verse what I did
was I had this petrol diesel I converted
this into heat and then do mechanical
work so in this case if you see they
talk increase the randoms increase it
was maybe a lately liter patrol and this
of heat even it out move
so all these things like to increase the
entropy of the system or say we see the
combustion reactions of the petrol there
is a intuitive knowledge who take care
of the ice and you keep the ice this
will get warm up to become water so
entropy of the system will also increase
if you see this move you have a smog in
do smog anything in doers gasps yeah it
expands on its own then properly the
random saying is right because this gas
is in this small box
they taught me is less the moment is
over the land import increased coins if
you have this coins in this structured
way you just take this coin in your hand
and just drop it and you will see that
it will come in some shape like this it
will not be in the otter way this is
order the lesson talking order just you
take this your hand in this throw form
so in the table or feet or something so
naturally you will see that it will get
some random shape so system wants to be
random and that's what in talking
increased everywhere you may say that in
this case we got this eyes and to make
this when you make this eyes from water
you have decreasing Ravi life but that
is not the case because he to make eyes
from what
we generally use refrigerator say in the
frigid air we provide electrical and
that case come away into heat energy
that is given out by the separator so
end of the day if you see if you add all
these things the electric original heat
original you see that even if you make
ice cold water in refrigerator your end
of the day is in a proper Linear's so
the entropy of the universe is always in
it that's what the second law of
thermodynamics say that you may be
scared I mean in problems what is
increasing what if what is the point
what is that then it always increase
they are awful stories going on this
there scientifically that a point will
come where the universe will stop and
that they call as entropic dead where
everything will be the equilibrium see
now this we feel the eyes because the
temperature determines the ice in the
normal room temperature right and the
whole idea of ohon's combustion works is
because there's a temperature difference
between the heat emitted by what he
calls the fire and the room temperature
what if you didn't Ravi know the table
is all equilibrium everything is all I
mean everything to the equilibrium level
and then they see they claim that earth
will stop the universal storm and
they'll be talking together or even
those things will not discuss now I can
move in more on that where they say that
they speculate that this thing will
happen because of the interview of the
system always increasing but it will
happen
maybe biliouris awful from today so we
should not worry
lotta mother so total in talk as I told
the reason why we study in propping was
we wanted to find the spontaneity of the
reaction right so to find this
continuity of reaction we have to find
them so what the later offically is
known you deal with total hockey here we
don't we only they lock the other skin
care system we need total improv you
like it as a
it's surrounding right so that was total
entropy is greater than zero
I say spontaneous totally improper is
zero I say the system is in equilibrium
the total ain't probably is less than
zero
I see that the process is non
spontaneous so in the next few slides
will tell you how to find the total
entropy of the system really difficult
but we'll explain how to find that but
before going to before finding the total
entropy of the system then find the co2
improv is nothing but in drop your
system plus interfere surrounding so
let's first find the into of your system
then we'll find the interview silence so
for your system we talk about apps are
it in talking so the absolute of
internal events in the mass of the
system
the bigger the mass the more isn't often
the molecular structure the system right
how it is structured whether they have
this lattice energy of bonding not like
this crystal kind of thing or they have
hydrogen modeling or there is no morning
altogether totally bent in the
temperature and pressure you increase
the temperature here all the improv
increase increase the pressure here the
entropic decrease so it all depends on
all these values right let me repeat the
mass the more the mass was in properly
structure the molecular structure the
temperature and pressure for all these
are the factors or means the absolute in
drawing let's take one example or improv
and the Gibbs energy thing the question
see is for the oxidation of iron that is
the rusting of iron and actually then
properly changes 5:49 point for Joule
per Kelvin per mole at 298 K in spite of
negative in crawfishing in this reaction
why is this reaction so the reaction for
this is if you have iron your oxidizes
which fe2 keep balance this this is my
balanced reaction this is my solid
my gas and this is also mines the
rusting of Ireland exam equation we have
and it says that Delta s is my Delta in
the system Delta s of the system is
minus five over nine point five that is
negative but still this one is why the
crooks here is we never talk about Delta
is off system we always talked about
Cheney in profit total and that is
nothing but changing interview of the
system plus change and in stock your
surrounding this is something we know is
minus 549 kilo Joule so in June to our
calorie but but this is something we
don't know so let us try to find this
guy is nothing but let's find this one
Delta s of surrounding is nothing but
Delta H by E correct so this becomes
minus of this this becomes minus of
minus 160 or eight into the power three
jewel in further mode by T t is what 298
Kelvin - 9 th you saw that this comes
out to be five five three zero Joule per
Kelvin this is Delta H of surrounding I
have to find in - total so let's find
what the value of Delta s Goten it comes
out to be Delta s of system that is
minus 5 4 9 point 4 Joule per Kelvin
mole Plus this guy surrounding five five
three zero Joule per Kelvin so if you
add this you get four nine eight zero
point 6 Joule per Kelvin
so you see the whole value is positive
Delta s tool is positive and that's why
this reaction is spontaneous correct
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