WEBVTT
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So in this problem, we have to find out
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them picker formal off you compounds were given it so
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in their funerals to find out the empirical formula off
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a compound from the person does office elements. So
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these are the rules. So first rule here is
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we assume that in the compound has a mass off
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hundred rum, and in that case, the person
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off each element will turn into the mass off each
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element. And from those messes, we'LL find out
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the number ofthe malls off each element. And as
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they know that the number of most of an element
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is simply the mass over smaller mass. And while
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entering while using the molar mass or atomic mass,
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four significant figures are used. Tto mess the position
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off the experiment of messes. And then, finally
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, the simplest hole number issue of those number off
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moles R off calculated by simply dividing each number of
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moles. Bye. The smallest number off mole.
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So that means that well, we will divide each
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number off malls calculated by the smallest number of malls
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to find a smallest, the simplest whole number ratios
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off the number of malls and from the simplest precio
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. We can easily find out them pretty informal of
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the compound. So that started this first problem here
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. So here we have fifty three, fifty five
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point three percent gay for advances person B and then
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thirty one one percent O. So first, you
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have to make sure that the total of these three
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hundred percent and if we just some this three up
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we'LL see that the total is hundred percent that there
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is no other element in this compound. So,
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as you have said the recording the first rule,
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we will consider that total mess as hundred creme.
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That means this person has values will turn in tow
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Graham Mass fellows. So that means we have fifty
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five point three grams game, fourteen point six grumpy
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and thirty point one room open. So from this
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values, you can find out the number of most
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off each element present. So most ofthe care,
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the partition will be equal to fifty five point three
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grams over the molar mass operation, which is a
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thirty nine point one zero Grandpa Ramon, and this
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will give us a value off one plant for one
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more and similarly we can find out the mall's ofthe
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year for us, for us. So first for
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us to develop for important six gram and the Mormons
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off us for us is thirty point nine seven.
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So this will give us a value off zero point
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four seven one more, Same way Confined the number
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of months off oxygen to the massive vaccinia is thirty
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point one graham and the molar mass of oxygen is
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sixteen point zero. Grandpa, Our mall, this
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really was well off one point eight eight mole.
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So now, using the second rule, what we'LL
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do is we will, um, divide each number
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of moles by the smallest number of malls to find
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the simplest ratio off the elements. So from Americans
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, see that the smallest number is thiss So we'LL
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divide each number of malls by this point foursome and
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one which will give us a ratio of the elements
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present in the compound. So the issue off Kay
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will be one point for one more over zero point
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four seven one mole. It will give us ever
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hello off two point nine nine. And since it
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is very close to three, we can write it
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as three, then for force for us. Their
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issue will be zero pond force. When one mall
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over zero point four seven one mall, you have
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no form. And then for oxygen, there issue
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will be one point eight eight more over zero point
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four seven. One more And this would give us
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and fellow off three point nine nine and which we
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can write us for. So the ratio off potassium
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force for us and oxygen here our trees to one
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is to four. So then pickle formula for this
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company will be get three b o four. So
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this is them bigger formula for this company. Now
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, In the second part of this problem, we
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have twenty five percent sodium, fourteen by nine percent
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. Silicon insisted, wants his person Floren. So
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again will ah, consider this person is as Graham
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And then we calculate the number of malls for each
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atom. Our element. So for sodium it will
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be twenty four point five. Graem oversaw Williams Moler
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, Mass, which is twenty two point nine nine
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Graham are more. Give us the value ofthe one
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point all six more Then we'LL find out number of
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malls off silicon So the mass of silicon here is
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fourteen point nine Graham and we have silicon smaller mouths
90
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which is twenty eight point oid Graham, far more
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. And this will give us a value off zero
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point five. Three more nineteen nineteen and grandpa are
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more and this will give us a fellow off three
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point one nine more. Now we will divide each
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number balls by the smallest number, which is zero
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point five three. So that will give us the
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ratio of which elements The issue of sodium will be
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one point all six over zero point five three,
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which is a round figure off too. Then for
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silicon it will be zero point five three over zero
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point five three. Give us one and for Floren
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Bay three point one nine over zero point five three
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give us a value off six point oto are making
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it approximately six. So their issue here is two
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is two, one is two six and that means
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them pickle formal will be in a tow is I
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have six. So this is them brittle formula for
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the compound Now in the tart bard we're given person
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does off carbon hydro's and nitrogen and we're saying that
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the rest are in the remaining oxygen safely. Subtract
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the total from hundred sixty two point one for US
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five point two one plus twelve point one. We
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will find that, um, the wrist is twenty
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point five three. So this is the percentage off
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oxygen. And now again, we'LL just simply count
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. Each percent is as massing Graham and we'LL find
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the number ofthe malls for each element. Symbols for
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carbon will be sixty two point one gram over carbon
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smaller mass, which is to a point one well
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. Give us a value off five point one seven
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mall and then for night rose, and it will
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be to have one, one says at the party
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00:10:37.014 --> 00:10:41.014 A:middle L:90%
is twelve point one overnight lows in smaller muss,
124
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which is fourteen point zero zero, and it will
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give us a fellow off zero point eight six more
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They're planned. It's a small then for Hydra zin
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. The mass is five point two one and the
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molar mas's one point or eat gram bar more,
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and this will give us value off five point one
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seven more. And for oxygen, the masses twenty
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point five three over oxygen. Smaller mass, which
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is sixteen part serial Gramp our mall And this will
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give us a value off one point two eight more
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So and now ammo This four number of malls you
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can see that zero point eight six is the smallest
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. Now we'LL divide each fellow with zero point six
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to get the simplest ratio. So the issue of
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Carmen will mean five point one seven over zero point
139
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eight six. This will give us a fellow off
140
00:12:22.256 --> 00:12:28.417 A:middle L:90%
six point zero one and we can write it six
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. Then for Hydra Zin it will be again Same
142
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five point one seven over zero point eight six which
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00:12:41.917 --> 00:12:48.067 A:middle L:90%
is six month one are approximately six. Then for
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nitro zin it will be him zero point eight six
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over zero point eight six She'LL be one and for
146
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OCS isn't it will be one point two eight over
147
00:13:11.447 --> 00:13:15.427 A:middle L:90%
zero point eight six and it'LL give us a well
148
00:13:15.427 --> 00:13:18.407 A:middle L:90%
off one point five. So now we can see
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that we have got three person it round figures But
150
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in this case it is, um just how far
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00:13:28.267 --> 00:13:31.726 A:middle L:90%
it through one and two That means we I cannot
152
00:13:31.616 --> 00:13:35.996 A:middle L:90%
around it the one or two So to make it
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a round figure, the smallest her own figure we
154
00:13:41.027 --> 00:13:43.557 A:middle L:90%
can make from his three. And for that we
155
00:13:43.557 --> 00:13:46.437 A:middle L:90%
have to multiply this by two multiplied by multiplying by
156
00:13:46.437 --> 00:13:48.427 A:middle L:90%
tool, you can get three. But in that
157
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case, we'LL have to multiply each number by two
158
00:13:52.917 --> 00:13:56.027 A:middle L:90%
. So we multiplied this six pay to get twelve
159
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six six multiplied by two when he was twelve.
160
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And for nitrogen it'Ll be one time to go to
161
00:14:05.086 --> 00:14:11.969 A:middle L:90%
two. Ooh! So the ratio off carbon,
162
00:14:11.969 --> 00:14:18.068 A:middle L:90%
hydrogen and nitrogen and oxygen here is twelve is to
163
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twelve isto twisted three And that man's the empirical formal
164
00:14:26.369 --> 00:14:33.619 A:middle L:90%
will be C two of each to have into or
165
00:14:33.629 --> 00:14:37.958 A:middle L:90%
three. So this is the empirical formal, um
166
00:14:39.048 --> 00:14:39.938 A:middle L:90%
, for that compound.