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Lysine, an essential amino acid in the human body, contains $\mathrm{C}, \mathrm{H}, \mathrm{O},$ and $\mathrm{N} .$ In one experiment, the complete combustion of $2.175 \mathrm{g}$ of lysine gave $3.94 \mathrm{g}$ $\mathrm{CO}_{2}$ and $1.89\ \mathrm{g}\ \mathrm{H}_{2} \mathrm{O} .$ In a separate experiment, $1.873 \mathrm{g}$ of lysine gave $0.436 \mathrm{g} \mathrm{NH}_{3} .$ (a) Calculate the empirical formula of lysine. (b) The approximate molar mass of lysine is $150 \mathrm{g} .$ What is the molecular formula of the compound?

a.) Total percentage of Carbon $+$ Hydrogen $+$ Oxygen $=49.37+9.6+19.17=78.14 \%$ Percentage of oxygen $=100-\text { (percentage of Carbon }+\text { Hydrogen }+\text { oxygen })=100-70.28=21.86 \%$mol percentage of carbon $=$ mass percentage/ molar mass $=49.37 / 12=4.11 \mathrm{mol} \%$ mol percentage of Hydrogen = mass percentage/ molar mass $=9.6 / 1=9.6 \mathrm{mol} \%$ mol percentage of nitrogen = mass percentage/ molar mass $=19.17 / 14=1.369 \mathrm{mol} \%$ mol percentage of oxygen = mass percentage/ molar mass $=21.86 / 16=1.366 \mathrm{mol} \%$b.) To arrive at a whole number divide with the smallest subscript, 1.366\[\begin{array}{l}C=4.11 / 1.366=3.0 \\H=9.6 / 1.366=7.0 \\N=1.369 / 1.366=1.0 \\0=1.366 / 1.366=1.0\end{array}\]As the numbers obtained are simple whole numbers, the empirical formulae of lysine is $\mathrm{C}_{3} \mathrm{H}, \mathrm{O}_{3} \mathrm{N}_{1}$(b) Empirical mass is the molecular mass derived from the empirical formulae. Empirical mass of $\mathrm{C}_{3} \mathrm{H}, \mathrm{O}_{1} \mathrm{N}_{1}$ is $73 .$ The approximate molar mass of lysine given is $150 \mathrm{g}$. The ratio of molecular mass to empirical mass is $150 / 73=2.05,$ which means that molecular formulae is twice the empirical formulae. Hence molecular formulae of lysine is $\mathrm{C}_{5} \mathrm{H}_{14} \mathrm{O}_{2} \mathrm{N}_{2}$

Chemistry 101

Chapter 3

Mass Relationships in Chemical Reactions

Chemical reactions and Stoichiometry

Carleton College

Rice University

Drexel University

Lectures

04:02

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Chemical reactions can be either spontaneous, requiring no input of energy, or non-spontaneous, typically following the input of some type of energy, such as heat, light or electricity. Chemical reactions are usually characterized by a chemical change, and they yield one or more products after the reaction is complete. Chemical reactions are described with chemical equations, which symbolically present the starting materials, end products, and sometimes intermediate products and reaction conditions. Chemical reactions happen at a characteristic reaction rate at a given temperature and chemical concentration. Typically, reaction rates increase with increasing temperature because there is more thermal energy available to reach the activation energy necessary for breaking bonds between atoms.

08:02

In chemistry, a combination reaction is a chemical reaction in which two or more reactants combine to form more than one product. In a decomposition reaction, one reactant splits into two or more products.

06:58

Lysine, an essential amino…

19:02

11:11

3.149 Lysine, an essential…

06:33

Lysine is an essential ami…

01:43

01:13

08:23

Lysine is a compound compo…

04:47

The amino acid arginine is…

09:20

You perform combustion ana…

00:53

Elemental Composition of A…

given information for about a do 0.175 gram of life Seen you, 3.94 g offs, your do and 1.89 grandma. It's duel number of Morse off carbon dioxide but isn't in 3.94 Good. Um is equal to 3.94 divided by 4 44 more is he quit? Duel Little points. You know it's 95 more if all the urban his being converged into carbon dioxide in the number of yourself. Carbon present in Lie Seen will also be the number off more of carbon imprisoned in Nice scene will also be is, you know, going is, you know, age 95 more therefore, most off carbon in die seeing and dear for must off carbon in NY scene just is equal to 0.0 age 95 Multiply wealth is it will do for one point. It's you know Stephen four Drone Most person dish off urban in do point one c 15 drama Bligh scene. You see, what do we hear? Fun 0.0 74 divided by do point 175 month by 100 is equal to for denying blind 37% and number of malls off border. Present in 1.89 Good all music body do 1.89 divided by 18 more is equal to zero point. When's you know five. Well, each water molecules contains two hydrogen, then the number off mall off hydrogen. Present in lie scene. Will be number of Moore's off numbers. Are rules off hydrogen or isn't in my scene. Will be two months to play is, you know, going one Geo fire mole is equal to 0.21 mon dear. For most of hydrogen in lysine is equal to zero point. There's little 0.21 I want to play. One is equal to 0.21 graham in most percent Tuchel hydrogen in two point one C 15 get on. Lie scene is it Will do. 0.1 little boy grew one divided by dew point one C. One prior Multi play 100 is equal to do 9.6 person. Most percent of hydrogen present in licensing is 9.6% in this disease. One point 87 Tree grandma lie scene give digital point for 36 Drama in his three. So a number of moles of ammonia present in zero point four 36 divided by 17 more is equal to do 0.0 proof for six more. If all you know Trojan has been converted into ammonia, then the number of more self nitrogen present, then the number of number of more yourself nine Georgian present present in Life seen will be well, we'll be zero point is your true 56 more dear for most off NYT, Lodging in lie scene Is it what to do? 0.256 I want to play. 14 is equal to you're going to 35 age Graham myself Nitrogen, present in Nice scene is 0.35 80 around and Ma's percentage off nitrogen nine. Coaching in 1.873 Grammar Bligh scene Lie scene is equal to 0.358 divided by when going eight. 1.8 C. One tree Multi play 100 Easy Winter 19.7 Dean but isn't in the total percentage of German Tish off urban plus hydrogen plus oxygen is it will do for denying going 37 less 9.6 Bless 19 points. 17 is equal through 78 point for Dean, person and person days off books eating is equal to 100 minus person dudes off Gurban Good urban unless but it's induced by drudging plus percent. Asia oxygen is equal to 100 minus, but as individual good bunnies ceiling G point Conte it is. It will do presentational carbon plus percentage of hydrogen plus in presentation. Oxygen is 70.28 in 100 minus. You want to 1000.28 is equal group 21.8 Disease person I mean more person to use of carbon easy people to must percentage divided by mullah. Muss is it will do 49 going to receive one. Do you read it by wells is equal to 4.11 more person in next is more percentage of hydrogen is able to most percentage Divided by Mowlam. US. Provided by more llamas is he wants to 9.6 divided by one. Is it true? Nine point sees moral person in my spurs and deserve hydrogen niece. No remorse person days off. Nitrogen ease. Easy Balto. Last person dish divided by water must is equal to 19 point 17 divided by 14. Is it well too? One point three 69 more poisoned wealth, nitrogen and one person to use off oxygen. Is it true? Mass percent is divided by Mowlam. US is. It will go 21 point you 26 divided by 16 this morning myself Excision is equal to 1.3 66 more person and now to arrive at ah whole number Divide to pick the smallest subscript 1.366 and carbon is equally true. 4.11 directed by smallest amount of Mali's one point 366 is ableto 3.0. Next hydrogen is equal to 9.6 divided pies. Minister. Moonda Monastery 1.3666 Little see one willing to zero. And next one East nitrogen is equal toe. One point free 69 divided by smallest amount of all is 1.366 is equal to one point. Is Udal aimed Oxygen musical True, one point 366 divided by smallest amount tamales 1.366 is equal to 1.0. So is the numbers obtained are simple whole numbers. The empirical formula off licence is so the empirical formula. No xeneize seeing three c three Behave, it's even. It's human. 01 in nitrogen is also one. This is the empirical formula Nitrogen in but be some very good mas is need more killer mass derived from the empirical formula. And Betty gonna myself license is 73. I am very good mas off si three n seven 01 and one is it will do. C one d three The approximate Mourner myself I seen given is the a proximate Moller Moss of my seen Given is 1 50 gram and yeah, the ratio up More molecular Musto Empirical the ratio off all killers Ma stool M Baruchel Maas Empirical Must is one 50 divided by say 123 Music Oneto no 0.5 Which means date? Well, killer from one iea's This means date. Well, you live for Mullah is two iced tea. I m very good. Formula ends more cooler formula of licensees off lie scene is C six It's 14 or do and into

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