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engineering HSC and IIT JEE main and
advance videos last lecture we have
studied three numericals which is based on means
numericals which will be is
Farady's first law and now we are
going to do another so let us see how
can we deal with it
so as mentioned in fos 3 as you can see
a question which is based to what the in
admin will be required to produce 2.36 9
into 10 raise to minus 3 kg of copper
from copper sulphate solution in one R
and how many moles of electrons are
required when the molar mass of copper
is given as 63.5 gram for Mole so
the first thing that we have to do is we
have to extract the data as well as we
have to convert those data in a proper
unit so as we could get a proper answer
so the so the answer that we could get
will be for a perfect one so before
doing that one so let us see that we
should convert this kg in to Graham
because all the weight that are being
deposited on the particular electrode
gets deposited in terms of gram and when
it comes to the I mean it is present in
mana this one R should be converted into
seconds and then only we could be very
much precise to the answer that is the
requirement for us so let's see the
given data is that we have
the weight or the mass of the copper
that is been deposited to us that has
been given to us and that has been
deposited is 2 point 3 6 9 into 10 raise
to minus 3 kg so this can be converted
into gram also as 2 point 3 6 9 into 10
raise to minus 3 where kilo is nothing
but then this 2 3 again this will cancel
out each other and the answer that we
could get is 2 point 3 6 9 gram of
copper the next one is there said that
the time required was 1 R so therefore
the time which is mentioned as one
should be converted into minutes so
therefore 1 into 60 minutes that can be
converted into seconds also so
eventually you will get an answer less
3600 seconds and lastly they have given
us the molecular weight
so therefore the molecular weight of
copper they have been mentioned here as
sixty three point five so with the help
of this data we could estimate what
would be the current that is what would
be the value of I when this kind of data
is given to us for that we know the
formula W is goes to Z I T divided by
nine six five zero zero but before
evaluating what will be the value of i
we don't know what is the value of Z so
we know that for copper sulfate copper
sulfate gets dissociated in the form of
Cu 2 plus plus and so forth to minus
therefore the valency of the copper is 2
so I could write it as Z is equals to
molecular weight divided by valency of
the metal in ionic form so therefore the
moniker weight which is given to us as
63 point 5 divided by the valency of the
copper that is we have got is 2
so this will give us an answer of 30
1.75 and with the help of this we could
estimate what would be the current
required to give this thing so therefore
then W can't they have provided to us s
2 point 3 6 9 gram which is easy equals
to Z that is 31 point 7 5 into current
which has been asked into time at a time
that is what they have provided to us is
3600 divided by nine 6500 coulombs
therefore I is equals to 2 point 3 6 9
into 9 6 5 0 0 divided by 31 point 7 5
into 3 6 0 0 so if we calculate this
thing we could get an answer s
to help it so this is how we have got
the value of current but the next
question is also revealing they have
asked that how many moles of electrons
would be required in this range so let
me tell you the weight that is been
deposited in this electrolytic process
is two point three six name and from
that we could estimate what will be the
number of moles of copper so the number
of moles of copper will be weight of
copper divided by modular weight of
copper so from that sense debate which
is provided as two point three six nine
and the molecule weight which is given
as sixty three point five will give us
an answer of
0.037 moles of copper but they have not
asked that how many bowls of copper are
being produced they have asked how many
moles of electrons are being involved in
this direction so let me tell you that
one copper when it is in solid form it
is giving us a value of 2 plus means Cu
2 plus is means copper is converted into
Cu 2 plus by eliminating 2 electrons so
therefore if one mole of copper is been
oxidizing is is undergoing oxidation to
give 2 holes of electron therefore if
0.037 moles of copper and in each case
one copper gives 2 electrons therefore
the 0.037 moles of copper will give
0.037
into two moles of electron that is
0.074 six moles of electron are being
involved in this process or are being
oxidized by the government so this is
how we have calculated that how many
moles of electrons are being involved in
this reaction so thank you friends for
watching this video I hope you have
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Iger and thank you so much
