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Ajouté : 2026-05-15

[00:01:25]That theory could the empirical formula.

[00:01:39]The empirical formula.

[00:01:47]The empirical formula.

[00:01:56]The empirical formula.

[00:02:14]The impirical formula was noting over 10 minutes only will be darkness science impirical formula.

[00:02:45]All right.

[00:03:03]is the representation is the representation.

[00:03:14]Empirical formula is the representation of a compound.

[00:03:26]Representation [snorts] of a compound in its simplest form or ratio.

[00:03:43]In its simplest form or ratio.

[00:03:51]in its simplest form or ration formula representation compound in its simplest form.

[00:04:19]For example, timeber 2019.

[00:04:28]So you write November 2019.

[00:04:37]So this question number 10 B.

[00:04:48]Determine the empirical formula.

[00:04:53]determine the empirical formula.

[00:04:59]Determine the what?

[00:05:06]The empirical The empirical formula of a compound made up of of a compound made up of 75% % made up of 75% by mass carbon by mass carbon and 25% by mass hydrogen and 25% by mass hydrogen.

[00:06:09]We explain this question.

[00:06:29]Formula of what?

[00:06:33]>> Of a compound.

[00:06:37]Compound.

[00:06:41]What is a compound?

[00:06:44]What is a compound?

[00:06:50]Is a new substance formed.

[00:06:54]Compound is a new substance form.

[00:06:59]When two or more elements When two or more elements When two or more elements When two or more elements are chemically joined together.

[00:07:22]When two or more elements are chemically joined together compound deton by mass of hydrogen. So this compound for carbon and carbon in this compound it was constituting 75%.

[00:08:23]And also it was also made up of hydrogen and in this compound hydrogen was constituting what 25%.

[00:08:33]So how do I formulate [clears throat] this compound 31 What is the symbol for carbon?

[00:09:10]C. What is the symbol for hydrogen? Hat empirical formula is representation of a compound in its simplest ratio. That's why that carbon is to hydrogen because this is how we write what ratio.

[00:09:32]C S2 H what is the percentage for C >> 75 what 75% by mass let us assume that the mass was 100 g the mass was 100 g which simply means 75% is the same as 75 what gh% % is representing 75 grand [clears throat] 25% 25 that make up this compound. We have carbon constituting 75% of the whole compound and we have hydrogen constituting 25% of the whole compound.

[00:10:41]First stage is to find number of mo of like this number of moles number of moles the mass is already given the mass is already given so I'm going to say over mass from the periodic First stage number of moles. Find number of moles.

[00:11:26]periodic table of hydrogen from the periodic table.

[00:11:37]It's what? It's one of Let's go. So, it's going to be just like that. What mo is 25 then div by the smallest. best then divide by the smallest right number of moles that I have is what 06 moles right as to what hydrogen number of moles what 25 moles so if they are saying divide both sides the smallest. What is the smallest?

[00:13:03]Both side by the smallest.

[00:13:06]The smallest is what?

[00:13:10]06 more. Both side by 06 more. This way.

[00:13:27]What is it?

[00:13:34][snorts] Everybody [laughter] Yeah, this was This one then divide by the smallest 6.25 divided by the smallest 25 smallest in the d6 25 by 65 right this one into this one s2 65 into this Three.

[00:15:37]Ratio ratio.

[00:15:42]Find the not ratio.

[00:15:49]Formula one. this one. Then my Hydrogen C for empirical formula, CH4, H2O, formula.

[00:16:25]Something close.

[00:16:47]What is it?

[00:16:53]Listen.

[00:17:08]Yand a compound. It contains a compound. It contains 40% carbon compound right 7% hydrogen and [clears throat] 53% oxygen elements E3 what S2 what? Oxygen percent oxygen 53% mass number of carbon from the periodic table.

[00:18:37]Mass number of hydrogen from the periodic table.

[00:18:41]Mass number of oxygen from the periodic table is what? 16. Whatever is is hydrogen number please don't say anything to what 6 to what the 3 3 1 2 5.

[00:19:24]All right.

[00:19:36]Let us divide by the smallest. What is the smallest in this case?

[00:19:44]Huh?

[00:19:46]3.

[00:19:48]So 3 3 then up again is 33 3 this one into this one. One s2. Do we get two here?

[00:20:05]Two s2 apple one. This one into this one. One into this one. Two into this one. One hula empirical formula.

[00:20:46]of the smallest.

[00:20:55]I think.

[00:21:08]All right. Live. It seems as if there are no questions.

[00:21:14]There are no questions there.

[00:21:17]So, we are done with combine the science.

[00:21:21]Let's go to Matt's questions, questions, questions.

[00:21:38]Questions, questions.

[00:21:48][clears throat] I think this was