WEBVTT
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Okay, So in this problem, we have to
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find out the empirical formal of some gun bones.
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And we're given in first part of this problem,
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Orin. But if this problem were given the number
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ofthe malls off the elements, which ah composes the
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compound, and from here, we have to find
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out them pickle formal of the compound. So if
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we were given number ofthe most off each element,
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what we have to do is first, we have
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to divide each number of malls. Bye. The
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smallest number off more present here. And then those
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fellows we have to tow, um, make it
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to the nearest hole number. And that will be
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the ratio off each element present in the compound.
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And that, and from the Chris you we can
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find out them bigger formula of the Capone. So
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here we can see that on the smallest value is
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zero point zero five two. So we will divide
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all of the number of malls by this aeroplane zero
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five two on which will give us the ratio off
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the elements. Saturation off care. The Parisian here
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will be Zira. Plant one ofthe four mall over
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this zero point zero five two more And this will
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give us Obama off tool on the ratio. Carbone
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will be zero point zero five two over zero point
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zero five two which will be eventually won. And
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then the ratio of oxygen will be zero point one
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five six more over zero Plant zero five tumult.
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And this will give us value off three. So
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that means the ratio of guests he oh, is
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to his two. One is two three and that
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therefore, we can write the empirical formal of the
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components since we have to keep going, right,
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Get two, we have one serious. Then we
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get to see and then we have three oxy and
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you're right old three. So this is the M
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Brickell formal of the company Just scared to see or
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three. Then in the are built, this family
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were given the mass off um Daelim and switch makes
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up the compound. So what do you have to
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do? First, we'LL have to find out in
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the number ofthe malls for each element as they know
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that the number of false is equal to mass over
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Mollema. So we'll divide this mass is by their
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molar mass is to get the number of malls off
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each element and from them. Well, just follow
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the procedure we did in the previous problem. So
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this fight for and find out and the number of
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malls forage element first samosa off s and our teen
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will be mass off. This switches five point two
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eight gram over its smaller mass, which is one
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one hundred eighteen point seven one one point seven.
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Grandpa Armel, you give us a valuable off zero
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point zero for four Moeller. So for based accuracy
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foot is down. Here is for the molar mass
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. Four significant figures are taken as the molar mass
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off each element. So the number of most off
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Dean is Syria. Plant zero four four mall,
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which you have calculated here. Then we can create
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the most ofthe Floren, which will be the massive
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Florian three point three seven gram over its smaller mass
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which is eighteen point nine nine. Grandpa, our
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mole and this will give us a value off zero
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point one seven seven mole. Now we have the
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number of malls off, but the elements present in
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the compound now again, we have to divide this
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number off malls by the smallest Velo. So from
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Americans say that the smallest value is zero point zero
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four four. So you'LL divide this to number of
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moles by zero point zero four four to find out
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the ratio of fifteen and Floren in this compound.
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So what we'LL do is so Oh, the ratio
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off Tina will be equal to It's a number of
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multi jizz in urban, zero for four by zero
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point zero for four and forgive us well off one
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. And then the ratio of Florian will be,
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um zero plant one seven seven more, which is
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the number of months of Florin we calculated over the
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zero point zero four formal. And this will give
80
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us the value ofthe four point Oto and since it
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is very close to four, we can write it
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four. So the ratio off Essen and if here
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is one is two four that was the empirical formula
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will be since we wanna send right, Hasan and
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we have four Florin and for real grazes subscript off
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for if so then Brickell formal um, for dis
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comported sn F four. Now the next part of
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this problem, we have to find out. They
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bring a formal offer compound, which has eighty seven
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point five percent of nitrogen and clip on five percent
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of hydrogen. So when we're given percent as off
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the elements, what we'LL do first is will's sum
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up the person it is to make sure that the
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total is hundred percent and there is no other element
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present in the calm bone. So eighty seven point
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five percent plus twelve point five percent easily we can
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see that is totally one hundred percent. That meant
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in this compound on ly nitrogen and hydrogen represent and
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no other elements is present there. Now what we
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have to do is when a person is given,
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we will assume that the total mass of the A
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sample of this company's hundred grams That means this eighty
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seven point five percent will turn into eighty seven point
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five gram and twelve point five percent will turn into
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a twelve point five gram. And then again,
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we'LL just find out the number of moles for each
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element and then we will ah, we'LL divide those
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number of moles by the smallest fellow and from there
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will find out the ratio of the elements So let's
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find out the number of walls for some balls off
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nitrogen here is eighty seven point five gram, which
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is the mass of nitrous and in the sample overnight
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prisons Moler, Mus, which is fourteen point zero
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zero. And this is in Grandpa our mole.
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This will give us a value of six point two
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five more. This is the number of malls off
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nitrogen. Now we'LL find the number of most ofthe
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hide Rosen So massive hydrogen is dual planned five gram
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and mola Mazo treasonous One point or eight Grandpa are
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more. This will give us a well off jewel
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plant for Sara Moeller. So this is the number
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of months of Hydra and now we have to divide
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the number most by the smallest relevant. This policy
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is six point two five. That means the ratio
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off nitrous and will be six point two five more
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divided by six planned to five months. Give us
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a bell off one and the issue of high treason
128
00:10:05.287 --> 00:10:15.147 A:middle L:90%
and will be to a point four zero mall over
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six point two five more. He was a fellow
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off one point nine eight. And since it's close
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toe too we can write it. Us too.
132
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So the ratio of nitrogen and hydrogen in this cos
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one is too, too. And that made them
134
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pickle. Formalize in H too. So this is
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the umbrella formula for the compound.