Search found 77 matches
- Tue Mar 12, 2019 9:44 pm
- Forum: First Order Reactions
- Topic: Integrated rate law confusion
- Replies: 5
- Views: 448
Re: Integrated rate law confusion
I don't believe there's a gain in using one over the other. It just depends on how you isolate the variables.
- Tue Mar 12, 2019 9:34 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: rate of disappearance
- Replies: 3
- Views: 502
rate of disappearance
How do we calculate a rate law if we are given the rate of disappearance instead of the rate of formation?
- Tue Mar 12, 2019 9:33 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Pre-equilibrium vs. steady-state
- Replies: 4
- Views: 490
Re: Pre-equilibrium vs. steady-state
the pre-equilibrium approach is a simpler way to get to the same solution with less complication.
- Tue Mar 05, 2019 9:14 pm
- Forum: Calculating Work of Expansion
- Topic: Keywords for each equation
- Replies: 4
- Views: 672
Re: Keywords for each equation
ChathuriGunasekera1D wrote:I know that I use the word "unique" to know if I have to use (-1/a)(dR/dt)
How do we apply the unique reaction rate?
- Tue Mar 05, 2019 9:07 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Equation to rate graph
- Replies: 2
- Views: 346
Re: Equation to rate graph
Since A is the reactant being used, its graph will be decreasing to a certain level and then stabilizes because equilibrium is reached. Since A has a coefficient of 2, the product B will be increasing/forming at a rate half of it. Product C will be forming at a rate triple the rate of A. Referencing...
- Tue Mar 05, 2019 8:57 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Finding Order for Each Reactant
- Replies: 4
- Views: 499
Re: Finding Order for Each Reactant
as long as the ratio of the the rates correspond to the concentrations that come along with them.
- Thu Feb 28, 2019 1:36 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cathode/Anode, +/-
- Replies: 2
- Views: 312
Re: Cathode/Anode, +/-
since this is a galvanic cell, we know that the reaction occurs spontaneously and energy is not required to start the reaction. You might be mixing this up with the concept of electrolytic cells brought up in lecture today because those require another source of energy for redox reactions to take pl...
- Thu Feb 28, 2019 1:24 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Electrode material in cell diagrams
- Replies: 1
- Views: 208
Re: Electrode material in cell diagrams
I believe that the solids must be placed on the outer part of the cell diagrams and the aqueous solutions are right next to the salt bridge. In regards to the liquid, I'm not too sure if it follows the same rules as solids.
- Tue Feb 26, 2019 12:42 am
- Forum: Balancing Redox Reactions
- Topic: redox potential
- Replies: 1
- Views: 192
redox potential
then is standard reduction potential equal to 0?
- Tue Feb 26, 2019 12:10 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Voltaic vs galvanic cell
- Replies: 2
- Views: 278
Re: Voltaic vs galvanic cell
You might be thinking about the difference between an electrolytic cell and galvanic cell. An electrolytic cell is one in which delta G is positive and the standard cell potential is negative. In a galvanic cell, delta G is negative and the standard cell potential is positive. galvanic=spontaneous a...
- Tue Feb 26, 2019 12:06 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Pt(s) in cell diagram
- Replies: 4
- Views: 492
Re: Pt(s) in cell diagram
the metal conductor is always added to the outer part of the cell diagram.
- Fri Feb 22, 2019 1:19 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Question 9.63
- Replies: 2
- Views: 322
Re: Question 9.63
I'm having trouble with this one as well. What is the relationship between gibbs free energy and stability? Do we have to consider the other thermodynamic terms as well?
- Wed Feb 20, 2019 8:26 pm
- Forum: Balancing Redox Reactions
- Topic: Salt Bridge
- Replies: 4
- Views: 406
Re: Salt Bridge
I believe they have the same function, but the shapes of them are what differ.
- Wed Feb 20, 2019 8:23 pm
- Forum: Ideal Gases
- Topic: units
- Replies: 15
- Views: 1262
Re: units
You would only use bar if the question were to ask, for example, the pressure of the gas at equilibrium.
- Thu Feb 14, 2019 10:50 pm
- Forum: Phase Changes & Related Calculations
- Topic: Phase Change Diagram of Water
- Replies: 6
- Views: 586
Re: Phase Change Diagram of Water
additional energy is required to change water from its boiling point to steam. Extra heat will cause the boiled water to reach vapor and burn more.
- Thu Feb 14, 2019 10:43 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Determine if molecule is in most stable form
- Replies: 5
- Views: 772
Re: Determine if molecule is in most stable form
certain diatomic molecules, like CO2 and H2O are in the most stable forms.
- Thu Feb 14, 2019 10:42 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Ideal gases
- Replies: 4
- Views: 445
Re: Ideal gases
rather than just using the ideal gas constant, you use 5/2R and 3/2R as the constants depending on whether volume or pressure is constant.
- Wed Feb 06, 2019 10:53 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: deltaU=3/2nRdeltaT
- Replies: 1
- Views: 253
Re: deltaU=3/2nRdeltaT
I think we're going to cover this further in class, but it seems to be related to the linearity of a molecule.
- Wed Feb 06, 2019 10:50 pm
- Forum: Calculating Work of Expansion
- Topic: Degeneracy
- Replies: 6
- Views: 790
Re: Degeneracy
is there a relationship between degeneracy and entropy?
- Wed Feb 06, 2019 10:41 pm
- Forum: Calculating Work of Expansion
- Topic: 6th edition 8.31
- Replies: 3
- Views: 338
Re: 6th edition 8.31
I was stuck on the same question. So we have to convert the given mass of the krypton gas into moles and work from there?
- Thu Jan 31, 2019 1:43 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Perfect system
- Replies: 3
- Views: 825
Re: Perfect system
I'm not entirely sure, but I'm assuming since there aren't any external factors affecting the course of the reaction, there won't be any so-called errors in the experiment.
- Thu Jan 31, 2019 1:38 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: closed vs isolated
- Replies: 14
- Views: 964
Re: closed vs isolated
A closed system is also sealed, but the transfer of energy is what is observed. When comparing open and closed systems, we observe changes in matter.
- Thu Jan 31, 2019 1:37 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Method 2: Using bond enthalpies
- Replies: 3
- Views: 350
Re: Method 2: Using bond enthalpies
Could you find the difference of the number of bonds broken and the total number of bonds formed? I remember learning it this way in high school, but I'm not too sure.
- Fri Jan 25, 2019 10:49 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Change in temp
- Replies: 3
- Views: 356
Re: Change in temp
Since the reaction requires heat, decreasing the temp would make it difficult for the reaction to take place. For this reason, the reaction shifts towards the reactants to form more heat necessary to carry out the reaction.
- Thu Jan 24, 2019 12:37 am
- Forum: Ideal Gases
- Topic: Ice Table with quadratic equation on bottom
- Replies: 3
- Views: 306
Re: Ice Table with quadratic equation on bottom
Does this reaction only have one product in either the gaseous or aqueous state?
- Thu Jan 24, 2019 12:35 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: help on last module!
- Replies: 2
- Views: 333
Re: help on last module!
I have the same question. Does it have anything to do with the volume increasing since liquid water is placed into the reaction? Would this therefore decrease the pressure of the system? I don't understand how water at its liquid state would be incorporated into the equilibrium constant.
- Thu Jan 24, 2019 12:33 am
- Forum: Ideal Gases
- Topic: Ideal Gas Law
- Replies: 7
- Views: 676
Re: Ideal Gas Law
It can be used to solve for any of the variables in the equation. Temperature is constant, so it'll be used to solve for the other conditions.
- Thu Jan 17, 2019 1:57 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Conjugates
- Replies: 4
- Views: 305
Re: Conjugates
The conjugate acid to the base will be the molecule that has gained a proton. The conjugate base to an acid will be the molecule that loses a proton.
HCOOH + H2O----HCOO[-] + H3O+
HCOOH is the acid and HCOO[-] is the conjugate base.
HCOOH + H2O----HCOO[-] + H3O+
HCOOH is the acid and HCOO[-] is the conjugate base.
- Thu Jan 17, 2019 1:50 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Percent Ionization
- Replies: 3
- Views: 238
Re: Percent Ionization
you can use a quadratic or maybe even a cubic function if it comes down to that. Checking the percent ionization does save time though.
- Tue Jan 15, 2019 1:18 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: stability
- Replies: 3
- Views: 358
stability
in the 7th edition 5I.13, the questions asks us to find the equilibrium composition of of the mixtures when 2.0mmol Cl2 and 2.0mmol F2 are placed in different 2.0L vessels at 1000. K. Part C asks which is more thermodynamically stable. How do we determine the stability? Is it based on the equilibriu...
- Thu Jan 10, 2019 4:38 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: H2O
- Replies: 5
- Views: 341
Re: H2O
Aurbal Popal wrote:Wait do we just ignore water as a liquid if we are doing partial pressures (Kp) or does this apply when we do Kc as well?
I believe so, since we only include gases and aqueous solutions in K expressions.
- Wed Jan 09, 2019 1:00 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 7th edition 5G.5
- Replies: 3
- Views: 214
Re: 7th edition 5G.5
I second this!! Also, how did you figure out part a and b? How do we determine equilibrium by looking at the molecules?
- Wed Jan 09, 2019 12:03 am
- Forum: Ideal Gases
- Topic: pressure notation
- Replies: 2
- Views: 220
pressure notation
what does P^o represent?
- Tue Jan 08, 2019 11:27 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: pressure when given temp and time
- Replies: 1
- Views: 253
pressure when given temp and time
I'm not sure how to approach this problem. In the 7th edition, it is part of the self test 3B.2A. A rigid oxygen tank stored outside a building has a pressure of 20.00atm at 6:00am, when the temp is 10 degrees celsius. What will be the pressure in the tank at 6:00pm, when the temp is 30. degrees cel...
- Thu Dec 06, 2018 3:33 am
- Forum: Lewis Acids & Bases
- Topic: HCl vs. HI
- Replies: 7
- Views: 710
Re: HCl vs. HI
You can also determine this based on the atomic radius. Since I has a larger atomic radius than Cl, it is easier for the I atom to release H+ than it is for Cl because of the looser pull of the electrons towards the central atom.
- Thu Dec 06, 2018 12:21 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular Shape
- Replies: 4
- Views: 496
Re: Molecular Shape
I believe its geometry comes about because of the lone pair on the iodine. If it were trigonal bipyramidal, there would not be any lone pairs on the central atom.
- Thu Dec 06, 2018 12:18 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Sig Figs for pH
- Replies: 3
- Views: 379
Re: Sig Figs for pH
Are the sig fig rules different when applied to pH, then?
- Thu Dec 06, 2018 12:17 am
- Forum: Naming
- Topic: Tricks/cheat sheet
- Replies: 3
- Views: 432
Re: Tricks/cheat sheet
I recommend making flashcards and referencing the sheet Dr.Lavelle has posted on the class website.
- Thu Dec 06, 2018 12:16 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Net Dipole
- Replies: 3
- Views: 998
Re: Net Dipole
When determining dipole moments, consider the electronegativity of the atoms in the molecule and check for any lone pairs on the central atom.
- Sat Dec 01, 2018 12:38 pm
- Forum: Resonance Structures
- Topic: Resonance
- Replies: 4
- Views: 611
Re: Resonance
In the case of the sulfate ion, sulfur and the oxygens that are double-bonded to the sulfur will have formal charges of zero. The oxygens that are single-bonded to the sulfur will each have a formal charge of negative one, adding up to negative two. This contributes to the sulfate ion's charge of ne...
- Sat Dec 01, 2018 12:32 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone pairs
- Replies: 4
- Views: 531
Re: Lone pairs
Lone pairs cause repulsion between the the atoms bonded to the central atom. They create a smaller bond angle between the atoms because the atoms will be pushed down.
- Sat Dec 01, 2018 12:27 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polar Molecules
- Replies: 12
- Views: 815
Re: Polar Molecules
You can check the number of lone pairs on the central atom and try to determine the shape of the molecule to find the overall dipole moment (if it exists).
- Mon Nov 26, 2018 9:28 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Homework question
- Replies: 4
- Views: 329
Re: Homework question
You want to check the formal charges of the atoms in the molecule, so that explains the bonding of xenon and fluorine in this example.
- Sat Nov 24, 2018 12:22 am
- Forum: Hybridization
- Topic: Octet Expansion and d-Orbitals
- Replies: 8
- Views: 766
Re: Octet Expansion and d-Orbitals
So is any element in the first 3 groups without a d-orbital in its shell unable to fulfill the octet rule? Under my current understanding, I believe any element in the first three groups don't have to meet the octet rule of maximum 8 electrons, it can exceed the octet rule since it has access to th...
- Thu Nov 22, 2018 10:43 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR
- Replies: 3
- Views: 486
Re: VSEPR
Does it only apply to gases?
- Thu Nov 22, 2018 10:27 am
- Forum: Hybridization
- Topic: Octet Expansion and d-Orbitals
- Replies: 8
- Views: 766
Re: Octet Expansion and d-Orbitals
So is any element in the first 3 groups without a d-orbital in its shell unable to fulfill the octet rule?
- Thu Nov 22, 2018 10:26 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: molecular vs electron geometry
- Replies: 2
- Views: 148
Re: molecular vs electron geometry
does this question apply to the example we did in lecture in which XeF4 was defined as having octahedral geometry and square planar shape? I was confused by this.
- Thu Nov 15, 2018 6:20 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: hydrogen bonding
- Replies: 11
- Views: 896
Re: hydrogen bonding
^Exactly. Higher melting points indicate more stability so this explains the example given in class: GC base pairs in DNA are more stable than AT base pairs. So does this mean GC base pairs have stronger bonds than AT base pairs? Yes, because G-C base pairs have three hydrogen bonds rather than two...
- Tue Nov 13, 2018 8:47 pm
- Forum: Electronegativity
- Topic: Polarity
- Replies: 3
- Views: 264
Re: Polarity
is the polarity determined only by the electronegativity of an atom, or are there other factors that contribute?
- Tue Nov 13, 2018 8:44 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: hydrogen bonding
- Replies: 11
- Views: 896
Re: hydrogen bonding
Alexa_Henrie_3B wrote:^Exactly. Higher melting points indicate more stability so this explains the example given in class: GC base pairs in DNA are more stable than AT base pairs.
So does this mean GC base pairs have stronger bonds than AT base pairs?
- Tue Nov 13, 2018 8:42 pm
- Forum: Lewis Structures
- Topic: Lewis Structure
- Replies: 3
- Views: 1001
Re: Lewis Structure
I am confused on this lewis structure in general. Is the octet rule for chlorine not supposed to be fulfilled?
- Mon Nov 12, 2018 12:35 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular Shape
- Replies: 5
- Views: 541
Re: Molecular Shape
I think there might also be a chart to help memorize the different shapes of molecules. It should list the number of bonded and lone pairs, which determine the molecular shape.
- Mon Nov 12, 2018 12:31 am
- Forum: Dipole Moments
- Topic: Dipole Moments [ENDORSED]
- Replies: 10
- Views: 921
Re: Dipole Moments [ENDORSED]
What exactly is a dipole moment? I know it was to do with charges, but is there a deeper explanation?
- Mon Nov 05, 2018 11:22 pm
- Forum: Lewis Structures
- Topic: Lewis Structure for N2O
- Replies: 7
- Views: 1183
Re: Lewis Structure for N2O
why is nitrogen more electronegative than oxygen? Does it relate to the number of electrons filling the d-orbital?
- Mon Nov 05, 2018 11:20 pm
- Forum: Resonance Structures
- Topic: Bond Lengths
- Replies: 7
- Views: 1937
Re: Bond Lengths
I don't understand where the 124 is coming from. Is there a calculation that needs to be done to come to this bond length value?
- Fri Nov 02, 2018 11:03 pm
- Forum: Trends in The Periodic Table
- Topic: Difference between Atomic Radius and Ionic Radius
- Replies: 2
- Views: 1064
Re: Difference between Atomic Radius and Ionic Radius
The periodic trends of atomic radius follow for both ionic and covalent radii also. The bonding types might be different, but the ionization energy will still be greater for an atom further across a period and smaller for an atom lower in a group.
- Mon Oct 29, 2018 11:39 pm
- Forum: DeBroglie Equation
- Topic: Uncertainty
- Replies: 4
- Views: 528
Re: Uncertainty
I believe that the rule applies to objects that are smaller than 10^-18. I am not confident on this though, so if anyone else knows, that would be helpful!
- Mon Oct 29, 2018 11:35 pm
- Forum: Lewis Structures
- Topic: Delocalized Electrons
- Replies: 5
- Views: 430
Re: Delocalized Electrons
This will also relate to sigma and pi bonds, which we will learn about later. It will make more sense when applied to these concepts.
- Sat Oct 27, 2018 9:38 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization Energy and Electron Affinity
- Replies: 9
- Views: 1794
Re: Ionization Energy and Electron Affinity
Yukta Italia 3I wrote:Why are electrons that are further away from the nucleus easier to remove?
The inner electrons shield the other electrons, causing a decrease in the effective nuclear charge. This allows for an easier removal of a valence electron.
- Sun Oct 21, 2018 7:33 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Question 1.15 sixth edition
- Replies: 10
- Views: 736
Re: Question 1.15 sixth edition
why is the energy level of 102.6 nm 1? This is what i don't understand. Even when I see pictures of the spectroscopy with the Lyman series, I notice that 102.6 is one of the values next to a line, but I'm not sure how to identify that it is n=1 . I just realized that we have to use an equation to s...
- Sun Oct 21, 2018 7:07 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: test #2
- Replies: 4
- Views: 315
Re: test #2
I believe it should still be 40 points like the last one.
- Sun Oct 21, 2018 7:03 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Lecture Question on Orbitals
- Replies: 4
- Views: 428
Re: Lecture Question on Orbitals
exactly what do all the quantum numbers represent?
- Tue Oct 16, 2018 9:11 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Question 1.15 sixth edition
- Replies: 10
- Views: 736
Re: Question 1.15 sixth edition
why is the energy level of 102.6 nm 1?
- Tue Oct 16, 2018 8:46 pm
- Forum: Properties of Light
- Topic: 7th Edition 1A.3
- Replies: 4
- Views: 249
Re: 7th Edition 1A.3
what is the relationship between energy and frequency?
- Tue Oct 16, 2018 8:36 pm
- Forum: Properties of Light
- Topic: still don't uderrsatnd what a photon is [ENDORSED]
- Replies: 20
- Views: 1261
Re: still don't uderrsatnd what a photon is [ENDORSED]
is there a certain constant that comes along with the size of a photon?
- Tue Oct 09, 2018 5:25 pm
- Forum: SI Units, Unit Conversions
- Topic: Avogadro's Number [ENDORSED]
- Replies: 11
- Views: 1293
Re: Avogadro's Number [ENDORSED]
Does Avogadro's number include units, or do we use the number alone?
- Tue Oct 09, 2018 5:08 pm
- Forum: Limiting Reactant Calculations
- Topic: HW1 M19
- Replies: 3
- Views: 504
Re: HW1 M19
Do we have to first convert the grams of each compound into moles and then find the mass of the individual elements from there?
- Tue Oct 09, 2018 5:01 pm
- Forum: Significant Figures
- Topic: Sig Fig zero rules
- Replies: 7
- Views: 2303
Re: Sig Fig zero rules
and just another sig fig rule is that if the decimal is 0.405, you would round your answer to 0.400 when needing 3 sig figs. When the last digit ends in five, would want to round the digit prior to it to the nearest even number.
- Sun Oct 07, 2018 10:22 pm
- Forum: Limiting Reactant Calculations
- Topic: Mole Ratios Within the Conversion
- Replies: 3
- Views: 330
Re: Mole Ratios Within the Conversion
Just by looking at the equation of a chemical reaction, how can we determine which reactant is limiting?
- Sun Oct 07, 2018 10:15 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: dilutions? [ENDORSED]
- Replies: 5
- Views: 601
Re: dilutions? [ENDORSED]
Sometimes the problem won't directly give you the initial molarity, so you might have to convert the given mass of solute to moles. Then divide by the volume of the solvent to find the initial molarity.
- Tue Oct 02, 2018 7:56 pm
- Forum: SI Units, Unit Conversions
- Topic: Fundamentals Problem E15
- Replies: 4
- Views: 319
Re: Fundamentals Problem E15
I first found the molar mass of the (OH)2, and then I subtracted this value from the given molar mass. This will give you the molar mass of the metal. Then, you must add the molar mass of the metal to the the molar mass of the sulfide ion to find the mass of the sulfide of this metal. Let me know if...
- Tue Oct 02, 2018 7:44 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Question E1(6th Edition)
- Replies: 7
- Views: 666
Re: Question E1(6th Edition)
Can we leave our answer in pm, or do we have to convert it to km?
- Sun Sep 30, 2018 11:38 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Fundamental E11
- Replies: 3
- Views: 2456
Re: Fundamental E11
The method I used to solve part a is by multiplying the mass of each with its correlating percentage of abundance and then added these products together.
m=0.0742(9.988x10^-24g)+0.9258(1.165x10^-23g)
m=1.153x10^-23g
Then I multiplied the sum of those two with Avogadro's constant and got 6.94g/mol
m=0.0742(9.988x10^-24g)+0.9258(1.165x10^-23g)
m=1.153x10^-23g
Then I multiplied the sum of those two with Avogadro's constant and got 6.94g/mol
- Sun Sep 30, 2018 10:58 pm
- Forum: Empirical & Molecular Formulas
- Topic: Problem E5
- Replies: 6
- Views: 3411
Re: Problem E5
How do you go about solving part b? Do I use the same equation I used for part A?
- Sun Sep 30, 2018 10:35 pm
- Forum: Empirical & Molecular Formulas
- Topic: Formula Units vs. Molecules [ENDORSED]
- Replies: 1
- Views: 361
Re: Formula Units vs. Molecules [ENDORSED]
I believe molecular unit refers to the mass of an entire molecular compound and formula unit refers to the mass of an ionic compound. These are defined on page F42 in the 7th edition book.
- Sun Sep 30, 2018 8:03 am
- Forum: Molarity, Solutions, Dilutions
- Topic: Study Module Post-assessment Question
- Replies: 5
- Views: 336
Re: Study Module Post-assessment Question
I am confused on this problem as well. I'm unsure of what the initial and final volumes are. I used the 15L as the initial volume and when it came to the final volume I was not sure whether to use the 0.02L or 0.250L.
- Fri Sep 28, 2018 1:07 pm
- Forum: Limiting Reactant Calculations
- Topic: Is there a specific way to solve limiting reactant problems?
- Replies: 4
- Views: 397
Re: Is there a specific way to solve limiting reactant problems?
The method I use to solve limiting reactant problems is by converting the reactants' mass into moles. I don't think this is impossible because once you have converted the reactants into moles, you compare the two. The reactant with less moles is the limiting reactant. I believe you can solve these k...