## Search found 67 matches

Tue Mar 12, 2019 4:20 pm
Forum: Experimental Details
Topic: Pre Equilibruim Approach
Replies: 6
Views: 1007

### Re: Pre Equilibruim Approach

involves k
Tue Mar 12, 2019 4:19 pm
Forum: General Rate Laws
Topic: Unique Rate Law
Replies: 4
Views: 201

### Re: Unique Rate Law

unique avg rate law
Tue Mar 12, 2019 4:19 pm
Forum: First Order Reactions
Topic: Rate law with 2 reactants
Replies: 3
Views: 167

### Re: Rate law with 2 reactants

one reactant is zero order and one is in first order
Wed Mar 06, 2019 4:09 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: zero and first
Replies: 5
Views: 228

### zero and first

what is the difference between zero and first order reaction rates?
Wed Mar 06, 2019 4:08 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: first and second order
Replies: 2
Views: 147

### first and second order

what is the difference between first and second order reaction rates?
Wed Mar 06, 2019 4:07 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Ecell
Replies: 13
Views: 450

### Re: Ecell

add the potential difference of the two half-reactions
Thu Feb 28, 2019 6:08 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: cell diagram h2o
Replies: 1
Views: 86

### cell diagram h2o

is h20 supposed to be in cell diagram? and is it wrong to put it in the cell diagram since it's neutral anyways?
Thu Feb 28, 2019 6:02 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: cell diagram h2o
Replies: 1
Views: 88

### cell diagram h2o

can we add h2o in cell diagram?
Thu Feb 28, 2019 6:00 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: van hoff and ph
Replies: 1
Views: 88

### van hoff and ph

how can we find if ph is basic or acidic with van hoff equation?
Thu Feb 28, 2019 6:00 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: van hoff
Replies: 1
Views: 84

### van hoff

do we need to van hoff equation for the test?
Tue Feb 19, 2019 9:06 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: difference between gibbs and entropy
Replies: 3
Views: 125

### difference between gibbs and entropy

What is the difference between gibbs free energy and entropy?
Tue Feb 19, 2019 9:05 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Test 3
Replies: 10
Views: 389

### Re: Test 3

It will cover Gibbs energy and electrochemistry.
Tue Feb 19, 2019 9:05 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Homework 6th Edition 9.63
Replies: 3
Views: 116

### Re: Homework 6th Edition 9.63

I think it is because more complex compounds have more bonds, thus more energy to break. And by having more bonds, it needs more energy to keep its form and more energy means more entropy, thus making it unstable.
Tue Feb 19, 2019 6:53 pm
Forum: Student Social/Study Group
Topic: workshop
Replies: 3
Views: 216

### Re: workshop

No he didn't
Tue Feb 19, 2019 6:51 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Isolated system
Replies: 10
Views: 610

### Re: Isolated system

thank you guys
Wed Feb 13, 2019 4:24 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Replies: 5
Views: 269

For changes in volume and temperature, do we just simply add them to get the total entropy?
Wed Feb 13, 2019 4:23 pm
Forum: Calculating Work of Expansion
Topic: Reversible vs irreversible
Replies: 6
Views: 442

### Reversible vs irreversible

Does w=-PdeltaV only work when there is constant pressure and when the reaction is irreversible?
Wed Feb 13, 2019 4:21 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Isolated system
Replies: 10
Views: 610

### Isolated system

How is a bomb calorimeter an isolated system?
Wed Feb 13, 2019 4:17 pm
Forum: Administrative Questions and Class Announcements
Topic: midterm location
Replies: 3
Views: 132

### Re: midterm location

thank you so much!
Wed Feb 13, 2019 4:13 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 6th edition 9.3
Replies: 2
Views: 120

### Re: 6th edition 9.3

thanks!
Wed Feb 13, 2019 4:07 pm
Forum: Administrative Questions and Class Announcements
Topic: midterm location
Replies: 3
Views: 132

### midterm location

did lavelle post the midterm locations? #asap
Wed Feb 06, 2019 3:42 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 9.9 6th edition
Replies: 1
Views: 111

### 9.9 6th edition

9.9 Calculate the entropy change associated with the isothermal expansion of 5.25 mol of ideal gas atoms from 24.252 L to 34.058 L.
Wed Feb 06, 2019 3:41 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 6th edition 9.3
Replies: 2
Views: 120

### 6th edition 9.3

9.3 (a) Calculate the change in entropy of a block of copper at 25 C that absorbs 65 J of energy from a heater. (b) If the block of copper is at 100. C and it absorbs 65 J of energy from the heater, what is its entropy change? (c) Explain any difference in entropy change.
Wed Feb 06, 2019 3:41 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 6th edition 9.1
Replies: 1
Views: 117

### 6th edition 9.1

9.1 A human body generates heat at the rate of about 100. W (1 W 1 J s 1). (a) At what rate does your body heat generate entropy in your surroundings, taken to be at 20. C? (b) How much entropy do you generate each day? (c) Would the entropy generated be greater or less if you were in a room kept at...
Wed Jan 30, 2019 6:18 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 6th edition 8.41
Replies: 1
Views: 87

### 6th edition 8.41

8.41 A 50.0-g ice cube at 0.0 C is added to a glass containing 400.0 g of water at 45.0 C. What is the nal temperature of the system (see Tables 8.2 and 8.3)? Assume that no heat is lost to the surroundings.
Wed Jan 30, 2019 6:15 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 6th edition 8.61
Replies: 2
Views: 88

### 6th edition 8.61

8.61 Calculate the reaction enthalpy for the synthesis of hydrogen bromide gas, H2(g) Br2(l) S 2 HBr(g), from the following data:
NH 1g2 HBr1g2 ¡ NH Br1s2 34
¢H° 188.32 kJ N 1g2 3 H 1g2 ¡ 2 NH 1g2 ¢H° 92.22 kJ
223
N 1g2 4 H 1g2 Br 1l2 ¡ 2 NH Br1s2
2 2 2 4
¢H° 541.66 kJ
Wed Jan 30, 2019 6:14 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 6th edition 8.73
Replies: 1
Views: 119

### 6th edition 8.73

8.73 Use the bond enthalpies in Tables 8.6 and 8.7 to estimate
the reaction enthalpy for
(a) 3 C2H2(g) ¡ C6H6(g)
(b) CH4(g) 4 Cl2(g) ¡ CCl4(g) 4 HCl(g) (c) CH4(g) CCl4(g) ¡ CHCl3(g) CH3Cl(g)
Fri Jan 25, 2019 2:03 pm
Forum: Phase Changes & Related Calculations
Topic: 6th edition 8.15
Replies: 1
Views: 262

### 6th edition 8.15

8.15 In an adiabatic process, no energy is transferred as heat. Indicate whether each of the following statements about an adiabatic process in a closed system is always true, always false, or true in certain conditions (specify the conditions): (a) U 0; (b) q 0; (c) q 0; (d) U q; (e) U w.
Fri Jan 25, 2019 2:02 pm
Forum: Phase Changes & Related Calculations
Topic: 6th edition 8.13
Replies: 1
Views: 109

### 6th edition 8.13

8.13 In a combustion cylinder, the total internal energy change produced from the burning of a fuel is 2573 kJ. The cooling system that surrounds the cylinder absorbs 947 kJ as heat. How much work can be done by the fuel in the cylinder?
Fri Jan 25, 2019 2:01 pm
Forum: Phase Changes & Related Calculations
Topic: 6th edition 8.11
Replies: 2
Views: 107

### Re: 6th edition 8.11

final* not nal
Fri Jan 25, 2019 2:01 pm
Forum: Phase Changes & Related Calculations
Topic: 6th edition 8.11
Replies: 2
Views: 107

### 6th edition 8.11

A piston con nes 0.200 mol Ne(g) in 1.20 L at 25 C. Two experiments are performed. (a) The gas is allowed to expand through an additional 1.20 L against a constant pressure of 1.00 atm. (b) The gas is allowed to expand reversibly and isothermally to the same nal volume. Which process does more work?
Tue Jan 15, 2019 11:05 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6th edition 12.25
Replies: 1
Views: 83

### 6th edition 12.25

12.25 Calculate the initial molarity of Ba(OH)2 and the molarities of Ba2 , OH , and H3O in an aqueous solution that contains 0.43 g of Ba(OH)2 in 0.100 L of solution.
Tue Jan 15, 2019 11:04 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 11.73 6th edition
Replies: 2
Views: 140

### 11.73 6th edition

11.73 State whether reactants or products will be favored by an increase in the total pressure (resulting from compression) on each of the following equilibria. If there is no change, explain why that is so. (a) 2 O3(g) ∆ 3 O2(g) (b) H2O(g) C(s) ∆ H2(g) CO(g) (c) 4 NH3(g) 5 O2(g) ∆ 4 NO(g) 6 H2O(g) ...
Tue Jan 15, 2019 11:03 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6th edition 11.53
Replies: 1
Views: 104

### 6th edition 11.53

11.53 A reaction mixture that consisted of 0.400 mol H2 and 1.60 mol I2 was introduced into a 3.00-L ask and heated. At equilibrium, 60.0% of the hydrogen gas had reacted. What is the equilibrium constant K for the reaction H2(g) I2(g) ∆ 2 HI(g) at this temperature?
Fri Jan 11, 2019 3:40 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6th edition 11.71
Replies: 1
Views: 191

### 6th edition 11.71

11.71 The four gases NH3, O2, NO, and H2O are mixed in a reaction vessel and allowed to reach equilibrium in the reaction 4 NH3(g) 5 O2(g) ∆ 4 NO(g) 6 H2O(g). Certain changes (see the following table) are then made to this mixture. Considering each change separately, state the effect (increase, decr...
Fri Jan 11, 2019 3:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6th edition 11.43
Replies: 1
Views: 126

### 6th edition 11.43

11.43 Consider the reaction 2 NO(g) ∆ N2(g) O2(g). If the initial partial pressure of NO(g) is 1.0 bar, and x is the equilibrium concentration of N2(g), what is the correct equilibrium relation? (a) K x2/(1.0 x); (b) K x2; (c) K x2/(1.0 2x)2;
(d) K 4x3/(1.0 2x)2; (e) K 2x/(1.0 x)2.
Fri Jan 11, 2019 3:37 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6th edition 11.15
Replies: 1
Views: 72

### 6th edition 11.15

11.15 (a) Calculate the reaction Gibbs free energy of I2(g) S 2 I(g) at 1200. K (K 6.8) when the partial pressures of I2 and I are 0.13 bar and 0.98 bar, respectively. (b) What is the spontaneous direction of the reaction? Explain briefly.
Mon Dec 03, 2018 3:39 pm
Forum: Identifying Acidic & Basic Salts
Topic: ch 12 6th ediiton 12.65
Replies: 1
Views: 114

### ch 12 6th ediiton 12.65

12.65 Determine whether an aqueous solution of each of the following salts has a pH equal to, greater than, or less than 7. If pH 7 or pH 7, write a chemical equation to justify your answer. (a) NH4Br; (b) Na2CO3; (c) KF; (d) KBr; (e) AlCl3;
(f) Cu(NO3)2.
Mon Dec 03, 2018 3:38 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: CH 12 6TH EDITION HW 12.127
Replies: 1
Views: 255

### CH 12 6TH EDITION HW 12.127

"12.127 The two strands of the nucleic acid DNA are held together by hydrogen bonding between four organic bases. The structure of one of these bases, thymine, is shown below. (a) How many protons can this base accept? (b) Draw the structure of each conjugate acid that can be formed. (c) Mark w...
Mon Dec 03, 2018 3:37 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: CH 12 6TH EDITION 12.119 HW
Replies: 1
Views: 250

### CH 12 6TH EDITION 12.119 HW

"12.119 Draw the Lewis structure of boric acid, B(OH)3. (a) Is resonance important for its description? (b) The proton transfer equilibrium for boric acid is given in a footnote to Table 12.1. In that reaction does boric acid act as a Lewis acid, a Lewis base, or neither? Justify your answer by...
Mon Nov 26, 2018 5:00 pm
Forum: Biological Examples
Topic: CH 17 6TH EDITION HW 17.31d
Replies: 4
Views: 207

### CH 17 6TH EDITION HW 17.31d

"17.31 Use the information in Table 17.4 to write the formula for each of the following coordination compounds:
(d) sodium bisoxalato(diaqua)ferrate(III)"
Mon Nov 26, 2018 4:57 pm
Forum: Naming
Topic: Naming complexes and coordination compounds
Replies: 4
Views: 184

### Naming complexes and coordination compounds

Are we required to memorize names for each anionic and neutral ligands?
Mon Nov 26, 2018 4:55 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: HW CH 17 6TH EDITION 17.37D
Replies: 1
Views: 56

### HW CH 17 6TH EDITION 17.37D

"17.37 With the help of Table 17.4, determine the coordination number of the metal ion in each of the following complexes:
(d) [Cr(edta)] "
Wed Nov 21, 2018 7:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: CH 4 4.19 HW 6TH EDITION
Replies: 2
Views: 146

### CH 4 4.19 HW 6TH EDITION

4.19 Predict the shapes and estimate the bond angles of (a) the thiosulfate ion, S2O32 ; (b) (CH3)2Be; (c) BH2 ; (d) SnCl2.
Wed Nov 21, 2018 7:50 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: HW CH4 4.75 6TH EDITION
Replies: 1
Views: 19

### HW CH4 4.75 6TH EDITION

4.75 An organic compound distilled from wood was found to have a molar mass of 32.04 g·mol 1 and the following composition by mass: 37.5% C, 12.6% H, and 49.9% O. (a) Write the Lewis structure of the compound and determine the bond angles about the carbon and oxygen atoms. (b) Give the hybridization...
Wed Nov 21, 2018 7:46 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: HW 6TH EDITION 4.45
Replies: 1
Views: 84

### HW 6TH EDITION 4.45

4.45 Describe the structure of the formaldehyde molecule, CH2O, in terms of hybrid orbitals, bond angles, and - and -bonds. The C atom is the central atom to which the other three atoms are attached.
Fri Nov 16, 2018 1:13 am
Forum: Determining Molecular Shape (VSEPR)
Topic: CH 4 4.91 HW 6TH EDITION
Replies: 1
Views: 44

### CH 4 4.91 HW 6TH EDITION

4.91 Benzyne, C6H4, is a highly reactive molecule that is detected only at low temperatures. It is related to benzene in that it has a six-membered ring of carbon atoms; but, instead of three double bonds, the structure is normally drawn with two double bonds and a triple bond. (a) Draw a Lewis stru...
Fri Nov 16, 2018 1:12 am
Forum: Determining Molecular Shape (VSEPR)
Topic: CH4 HW 4.43 6TH EDITION
Replies: 1
Views: 43

### CH4 HW 4.43 6TH EDITION

4.43 Noting that the bond angle of an sp3 hybridized atom
is 109.5 and that of an sp2 hybridized atom is 120 , do you expect the bond angle between two hybrid orbitals to increase or decrease as the s-character of the hybrids is increased?
Fri Nov 16, 2018 1:10 am
Forum: Determining Molecular Shape (VSEPR)
Topic: CH 4 HW 4.41 6TH EDITION
Replies: 3
Views: 129

### CH 4 HW 4.41 6TH EDITION

Acrylonitrile, CH2CHCN, is used in the synthesis of acrylic fibers (polyacrylonitriles), such as Orlon. Write the Lewis structure of acrylonitrile and describe the hybrid orbitals on each carbon atom. What are the approximate values of the bond angles?
Fri Nov 09, 2018 6:43 pm
Forum: Lewis Structures
Topic: 6th edition ch3 3.123
Replies: 1
Views: 80

### 6th edition ch3 3.123

"Methane, the most abundant hydrocarbon in the atmosphere, is slowly oxidized in the air to carbon dioxide. Both compounds contribute to global warming, with CH4 more potent than CO2. An intermediate in the oxidation of methane to carbon dioxide is HOCO. (a) Draw the Lewis structure for this co...
Fri Nov 09, 2018 6:42 pm
Forum: Lewis Structures
Topic: 6th edition ch3 3.103
Replies: 1
Views: 136

### 6th edition ch3 3.103

''3.103 Quinone, C6H4O2, is an organic molecule with the structure shown below; it can be reduced to the anion C6H4O22 . (a) Draw the Lewis structure of the reduced product. (b) On the basis of formal charges derived from the Lewis structure, predict which atoms in the molecule are most negatively c...
Fri Nov 09, 2018 6:40 pm
Forum: Lewis Structures
Topic: 6th edition ch3 3.99
Replies: 1
Views: 162

### 6th edition ch3 3.99

''In 1999, Karl Christe synthesized and characterized a salt that contained the N5 cation, in which the ve N atoms are connected in a long chain. This cation is the rst all-nitrogen species to be isolated in more than 100 years. Draw the most important Lewis structure for this ion, including all equ...
Tue Oct 30, 2018 11:47 am
Forum: Ionic & Covalent Bonds
Topic: HW 3.87 6TH EDITION
Replies: 1
Views: 110

### HW 3.87 6TH EDITION

3.87 Which do you predict to have the strongest CX bond, where X is a halogen: (a) CF4, (b) CCl4, or (c) CBr4? Explain.
Tue Oct 30, 2018 11:46 am
Forum: Ionic & Covalent Bonds
Topic: 3.61 6TH EDITION HW
Replies: 1
Views: 183

### 3.61 6TH EDITION HW

3.61 Determine the numbers of electron pairs (both bonding and lone pairs) on the iodine atom in (a) ICl2 ; (b) ICl4 ;
(c) ICl3; (d) ICl5.
Tue Oct 30, 2018 11:44 am
Forum: Ionic & Covalent Bonds
Topic: 3.41 6TH EDITION
Replies: 1
Views: 82

### 3.41 6TH EDITION

Write the complete Lewis structure for each of the following compounds: (a) formaldehyde, HCHO, which as its aqueous solution, “formalin,” is used to preserve biological specimens; (b) methanol, CH3OH, the toxic compound also called wood alcohol; (c) glycine, H2C(NH2)COOH, the simplest of the amino ...
Thu Oct 25, 2018 9:32 pm
Forum: Trends in The Periodic Table
Topic: CH 2 6TH EDITION 2.47
Replies: 2
Views: 156

### CH 2 6TH EDITION 2.47

2.47 For each of the following ground-state atoms, predict the type of orbital (1s, 2p, 3d, 4f, etc.) from which an electron will be removed to form the 1 ion: (a) Ge; (b) Mn; (c) Ba; (d) Au.
Thu Oct 25, 2018 9:29 pm
Forum: Trends in The Periodic Table
Topic: CH 2 6TH EDITION 2.85
Replies: 2
Views: 126

### CH 2 6TH EDITION 2.85

2.85 In the heavier transition-metal elements, especially the lanthanoids and actinoids, there are numerous exceptions to the regular order of orbital occupation predicted by the building- up principle. Suggest why more exceptions would be noted for there elements.
Thu Oct 25, 2018 9:27 pm
Forum: Trends in The Periodic Table
Topic: CH 2 6TH EDITION 2.81
Replies: 2
Views: 152

### CH 2 6TH EDITION 2.81

Ionization energies usually increase on going from left to right across the periodic table. The ionization energy for oxygen, however, is lower than that of either nitrogen or fluorine. Explain this anomaly.
Sun Oct 21, 2018 2:03 pm
Forum: *Shrodinger Equation
Topic: Application of Equation on test
Replies: 5
Views: 534

### Application of Equation on test

For Shrodinger Equation, how do we apply this on the test if we are said not to compute any actual numbers?
Sun Oct 21, 2018 2:01 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: CH 1 1.55 6TH EDITION
Replies: 1
Views: 64

### CH 1 1.55 6TH EDITION

It says "1.55 Infrared spectroscopy is an important tool for studying vibrations of molecules. Just as an atom can absorb a photon of suitable energy to move an electron from one electronic state to another, a molecule can absorb a photon of electromagnetic radiation in the infrared region to m...
Sun Oct 21, 2018 1:57 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: CH 1 1.39 6TH EDITION
Replies: 2
Views: 97

### CH 1 1.39 6TH EDITION

It says "A baseball must weigh between 5.00 and 5.25 ounces (1 ounce 28.3 g). What is the wavelength of a 5.15-ounce baseball thrown at 92 mph?"
Sun Oct 14, 2018 5:09 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: HW 2 CH 1 1.39
Replies: 2
Views: 71

### HW 2 CH 1 1.39

It says "A baseball must weigh between 5.00 and 5.25 ounces (1 ounce 28.3 g). What is the wavelength of a 5.15-ounce baseball thrown at 92 mph?"
Sun Oct 14, 2018 5:08 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: HW 2 ch1 1.51
Replies: 2
Views: 91

### HW 2 ch1 1.51

It says " Infrared spectroscopy is an important tool for studying vibrations of molecules. Just as an atom can absorb a photon of suitable energy to move an electron from one electronic state to another, a molecule can absorb a photon of electromagnetic radiation in the infrared region to move ...
Sun Oct 14, 2018 5:07 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: HW 2 CH1 Problem 1.43
Replies: 1
Views: 41

### HW 2 CH1 Problem 1.43

It says "What is the minimum uncertainty in the speed of an electron con ned to within a lead atom of diameter 350. pm? Model the atom as a one-dimensional box with a length equal to the diameter of the actual atom."

How do I start this problem?
Sun Oct 07, 2018 5:06 pm
Forum: Significant Figures
Topic: Multiplication/Division and Addition/Subtraction in Sig Figs
Replies: 2
Views: 115

### Multiplication/Division and Addition/Subtraction in Sig Figs

Can someone explain how to apply sig figs in addition/subtraction and multiplication/division?

Sun Oct 07, 2018 5:04 pm
Forum: Limiting Reactant Calculations
Topic: HW1 M19
Replies: 3
Views: 338

### HW1 M19

It says "M.19 A stimulant in coffee and tea is caffeine, a substance of molar mass 194 g mol 1. When 0.376 g of caffeine was burned, 0.682 g of carbon dioxide, 0.174 g of water, and 0.110 g of nitrogen were formed. Determine the empirical and molecular formulas of caffeine, and write the equati...
Sun Oct 07, 2018 5:01 pm
Forum: Empirical & Molecular Formulas
Topic: HW1 F19
Replies: 2
Views: 126

### HW1 F19

The question is "F.19 Caffeine, a stimulant in coffee and tea, has a molar mass of 194.19 g mol 1 and a mass percentage composition of 49.48% C, 5.19% H, 28.85% N, and 16.48% O. What is the molecular formula of caffeine?" What is the first step of this problem and why is the molar mass nee...