Search found 72 matches
- Sat Dec 08, 2018 4:39 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Uncertainty
- Replies: 1
- Views: 433
Uncertainty
When using the uncertainty equation how do you know when to give your answer using "greater than" or "equal" sign?
Naming
Why do we include "bis" for oxalato for the complex [RhCl(OH)(C2O4)2]8H20 ?
- Thu Dec 06, 2018 3:02 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: CO3^2-
- Replies: 2
- Views: 314
CO3^2-
Why is CO3^2- both monodenate and bidentate if there's three oxygens and together they have 8 lone pairs. One double between C and O and three single bonds between C and O. So, why isn't a polydentate?
- Thu Dec 06, 2018 1:20 am
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: 6C.21 (7th ed)
- Replies: 1
- Views: 223
6C.21 (7th ed)
Why is formic acid slightly stronger than acetic acid? Also, is an acid weaker if it has more H's attached?
- Wed Dec 05, 2018 11:14 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: 9C.5 (7th ed)
- Replies: 2
- Views: 321
9C.5 (7th ed)
Which of the following ligands can be polydentate? If the ligand can be polydentate, give the maximum number of places on the ligand that can bind simultaneously to a single metal center: a)HN(CH2CH2NH2)2; b)CO3^2-; c)H20; d) oxalate I know polydentate means that it has more than 2 regions to form r...
- Wed Dec 05, 2018 6:21 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Unidentate
- Replies: 3
- Views: 388
Unidentate
How would do you identify if a molecule is unidentate or polydentate?
- Sun Dec 02, 2018 9:59 pm
- Forum: Lewis Acids & Bases
- Topic: Amphoteric Compounds
- Replies: 1
- Views: 224
Amphoteric Compounds
If you are given a chemical reaction how would you identify whether the molecule is amphoteric?
- Sun Dec 02, 2018 9:55 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Sigma and Pi Bonds
- Replies: 6
- Views: 930
Re: Sigma and Pi Bonds
Yes, that is correct for every double bond there is one sigma and one pi bond and for every triple bond there is two pi bonds and 1 sigma bond.
- Sun Dec 02, 2018 9:53 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Square Planar
- Replies: 12
- Views: 1985
Re: Square Planar
All the bond angles are equal to 90 the bond shape of two lone pairs and four bonds cancel out.
- Sun Dec 02, 2018 9:52 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted Acid vs Lewis Acid
- Replies: 2
- Views: 342
Bronsted Acid vs Lewis Acid
How would you identify a Lewis acid vs a Bronsted acid?
- Fri Nov 30, 2018 1:27 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: H-Bonding and Dipole Dipole
- Replies: 2
- Views: 331
H-Bonding and Dipole Dipole
If there is hydrogen bonding present in a molecule are there also dipole-dipole forces present?
- Sat Nov 24, 2018 5:50 pm
- Forum: Electronegativity
- Topic: Determine Electronegativity of Molecule
- Replies: 1
- Views: 241
Determine Electronegativity of Molecule
How do you know which molecule has the greatest electronegativity without doing any calculations? For example, HF or HI?
- Sat Nov 24, 2018 5:48 pm
- Forum: Dipole Moments
- Topic: Dipole Moment
- Replies: 2
- Views: 623
Dipole Moment
How do you determine which molecule has the greatest or smallest dipole moment?
- Sat Nov 24, 2018 1:18 am
- Forum: Hybridization
- Topic: 2.45 (7th ed)
- Replies: 1
- Views: 255
2.45 (7th ed)
How come when writing the hybridization for a sigma bond between oxygen and carbon we use the notation (C2sp2,O2sp2), but when we write the notation for the oxygen lone pair we do not include the 2--which refers to oxygen being in the second row--and simply write (Osp2) for the lone pair? So, why do...
- Sat Nov 17, 2018 4:36 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Seesaw and T-Shape
- Replies: 1
- Views: 268
Seesaw and T-Shape
What are the bond angles for seesaw and T-shape? Various sources give different estimations but I'm not sure which is the most accurate.
- Sat Nov 17, 2018 11:33 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Square Pyramidal
- Replies: 2
- Views: 306
Re: Square Pyramidal
Yes, the shape is possible its electron geometry is Octahedral. The general formula would be AX5E because of the 5 bonds it forms and the one lone pair it has.
- Sat Nov 17, 2018 3:36 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sigma and Pi Bonds
- Replies: 2
- Views: 263
Re: Sigma and Pi Bonds
First, you would need to have the Lewis Structure provided or draw the Lewis Structure for the molecule. Then you would look at at where the molecule forms single bonds those would be your sigma bonds and wherever it forms double bonds you would have one pi bond and one sigma bond and wherever tripl...
- Sat Nov 17, 2018 2:12 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Seesaw Shape
- Replies: 4
- Views: 404
Seesaw Shape
Would the bond angles for the Seesaw shape be 90,120,180. If so, would all the bond angles be slightly less than that of the trigonal bipyramidal?
- Fri Nov 16, 2018 3:21 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: H-Bonding
- Replies: 8
- Views: 2237
Re: H-Bonding
Hydrogen bonding only occurs for bonds between F,O,N.
- Fri Nov 16, 2018 10:09 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 2E.25 (7th ed)
- Replies: 2
- Views: 265
2E.25 (7th ed)
For the molecule CH2Cl2 if I arrange the two H's opposite of each other and the Cl's opposite of each other the dipole moments cancel out making it nonpolar, but if I don't rearrange the H's and Cl's opposite of each other it's a polar molecule. How would I know which is the correct polarity?
- Fri Nov 09, 2018 10:51 am
- Forum: Electronegativity
- Topic: Electronegativity relationship with Polarizability
- Replies: 3
- Views: 772
Re: Electronegativity relationship with Polarizability
So, for electronegativity anions with a higher electronegativity have a weaker effective nuclear charge due to the addition of shells and because those anions such as Iodine that are far away from the charge of the nucleus its much easier for them to become distorted by cations. The higher the elect...
- Fri Nov 09, 2018 10:11 am
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: electron distortion
- Replies: 4
- Views: 450
Re: electron distortion
It involves atomic radius. So you can think about it as the smaller the cation the stronger its going to be attached to the nucleus charge making it easier to take away electrons from the anion and if the cation takes away those electrons then its going to distort or mess with the structure of the a...
- Fri Nov 09, 2018 10:05 am
- Forum: Trends in The Periodic Table
- Topic: Bond Lenghts
- Replies: 7
- Views: 917
Bond Lenghts
How can you tell which molecules have a greater bond length without having its Lewis structure? I know when you have two ions you look for polarizability but what about when you have multiple elements involved?
- Fri Nov 09, 2018 8:59 am
- Forum: Bond Lengths & Energies
- Topic: 2D.3 (7th ed)
- Replies: 2
- Views: 247
2D.3 (7th ed)
Why does BaBr2 have more ionic bonds than BeBr2?
- Sun Nov 04, 2018 12:43 am
- Forum: Resonance Structures
- Topic: 2B.15 (7th ed) [ENDORSED]
- Replies: 1
- Views: 175
2B.15 (7th ed) [ENDORSED]
Draw the Lewis structures that contribute to the resonance hybrid of nitryl chloride, ClNO2 (N is the central atom). How come the solution to this problem doesn't show two double bonds between both oxygens and nitrogen? Is it not allowed? Can someone please explain when we are allowed to make multip...
- Fri Nov 02, 2018 9:53 pm
- Forum: Trends in The Periodic Table
- Topic: 1F.11 (7th ed)
- Replies: 1
- Views: 284
1F.11 (7th ed)
Which element of each of the following pairs has the higher electron affinity.
a. Te or I
b. Be or Mg
c. O or S
d. Ga or In
Why are b and d both equal in energy? And for part c sulfur has a greater affinity even though its down the group meaning effective nuclear charge decreases?
a. Te or I
b. Be or Mg
c. O or S
d. Ga or In
Why are b and d both equal in energy? And for part c sulfur has a greater affinity even though its down the group meaning effective nuclear charge decreases?
- Fri Nov 02, 2018 8:41 pm
- Forum: Resonance Structures
- Topic: 2B.19 (7th ed)
- Replies: 2
- Views: 302
2B.19 (7th ed)
Draw the Lewis structure and determine the formal charge on each atom.
So far CN- how come we couldn't have done 5 bonds with 1 lone pair on nitrogen. The solution shows 3 bonds and 1 lone pair on C and 1 lone pair on nitrogen but I don't understand why they have that structure?
So far CN- how come we couldn't have done 5 bonds with 1 lone pair on nitrogen. The solution shows 3 bonds and 1 lone pair on C and 1 lone pair on nitrogen but I don't understand why they have that structure?
- Fri Nov 02, 2018 7:59 pm
- Forum: Resonance Structures
- Topic: Determine Number of Resonance Structures
- Replies: 2
- Views: 1615
Determine Number of Resonance Structures
How do we determine how many resonance structures there are for a molecule?
- Fri Nov 02, 2018 6:39 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Experiment - Chem Test 2
- Replies: 3
- Views: 544
Re: Photoelectric Experiment - Chem Test 2
Was the kinetic energy 5.5x^10^6?
- Fri Nov 02, 2018 6:30 pm
- Forum: SI Units, Unit Conversions
- Topic: Molar Mass to Kg
- Replies: 6
- Views: 17317
Molar Mass to Kg
How would we convert from g/mol to kg if the element is unknown meaning we don't know the mass of the element?
- Fri Nov 02, 2018 4:33 pm
- Forum: Properties of Electrons
- Topic: Test 2
- Replies: 1
- Views: 438
Test 2
How would we convert 5 mol of electrons to kg? Would we simply multiply 5 mol by avogadro's number?
- Thu Nov 01, 2018 7:11 pm
- Forum: Ionic & Covalent Bonds
- Topic: 2A.15 (7th Ed)
- Replies: 1
- Views: 205
2A.15 (7th Ed)
Write the most likely charge for the ions formed each of the following elements.
How would I determine how many electrons Te would gain or lose if it's a metalloid?
How would I determine how many electrons Te would gain or lose if it's a metalloid?
- Sun Oct 28, 2018 10:44 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Degeneracy
- Replies: 3
- Views: 366
Re: Degeneracy
It means that all orbitals have the same energy. So the three orbitals in 2p are degenerate because they have the same energy.
- Sun Oct 28, 2018 6:44 pm
- Forum: Lewis Structures
- Topic: Lewis Structure
- Replies: 2
- Views: 203
Lewis Structure
How do you know which Lewis structure is the most stable?
- Fri Oct 26, 2018 12:34 am
- Forum: DeBroglie Equation
- Topic: Measurable wavelength properties
- Replies: 5
- Views: 581
Re: Measurable wavelength properties
The object will not have wavelike properties for objects such as 10^-34 because they are to big too big. I believe the maximum it can be is 10^-18 for it to have wavelength properties.
- Thu Oct 25, 2018 11:43 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Module Question 20
- Replies: 4
- Views: 803
Module Question 20
20. Use the above uncertainty in velocity to calculate the electron's uncertainty in kinetic energy. Then calculate the uncertainty in kinetic energy per mole of electrons (that is, per mole of hydrogen atoms). Comment on your value. I calculated the uncertainty in kinetic energy, but how do we calc...
- Sat Oct 20, 2018 5:43 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Schrodinger's Wave Function
- Replies: 10
- Views: 947
Schrodinger's Wave Function
Are we expected to apply Schrodinger's wave function equation for the test? If so, under what scenarios?
- Sat Oct 20, 2018 5:35 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Nodes
- Replies: 1
- Views: 204
Nodes
How does the experiment on atomic spectra where we discussed the Balmer and Lyman Series relate to the nodes of an orbit? I know it has to do with the energy levels but can someone give a detailed explanation. Thank you.
- Thu Oct 18, 2018 9:22 pm
- Forum: DeBroglie Equation
- Topic: De Broglie
- Replies: 12
- Views: 1445
De Broglie
When do you know when to use the De Broglie equation?
- Thu Oct 18, 2018 9:20 pm
- Forum: Photoelectric Effect
- Topic: 1B.7
- Replies: 3
- Views: 188
Re: 1B.7
Where did you get the energy of sodium from?
- Thu Oct 18, 2018 8:21 pm
- Forum: Photoelectric Effect
- Topic: 1B.7
- Replies: 3
- Views: 188
1B.7
Sodium vapor lamps, used for public lighting, emit yellow light of wavelength 589nm. How much energy is emitted by: a) an excited sodium atom when it generates a photon b) 5.00 mg of sodium atoms emitting light at this wavelength c) 1.00 mol of sodium atoms emitting light at this wavelength So part ...
- Tue Oct 16, 2018 12:34 am
- Forum: Einstein Equation
- Topic: Calculate Number of Photons
- Replies: 3
- Views: 241
Re: Calculate Number of Photons
Why do we have to divide energy by the energy of a photon? I know its to calculate the number of photons, but how did you know we had to divide?
- Tue Oct 16, 2018 12:18 am
- Forum: Einstein Equation
- Topic: Calculate Number of Photons
- Replies: 3
- Views: 241
Calculate Number of Photons
Question 1B.9:A lamp rated at 32W emits violet light of wavelength 420nm. How many photons of violet light can the lamp generate in 2 seconds?
So I calculated the energy per photon which turned out to 4.7x10^-19 J, but I'm not sure what are the next steps I need to take to find the number of photons.
So I calculated the energy per photon which turned out to 4.7x10^-19 J, but I'm not sure what are the next steps I need to take to find the number of photons.
- Sat Oct 13, 2018 10:35 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Bohr Frequency
- Replies: 2
- Views: 208
Bohr Frequency
When talking about the incoming light that matches the energy difference are the words light and frequency used interchangeably?
- Sat Oct 13, 2018 5:53 pm
- Forum: Properties of Electrons
- Topic: Module Photoelectric Effect
- Replies: 2
- Views: 203
Re: Module Photoelectric Effect
I realized I didn't post the full question. Here's the entire question.
Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m.s-1. The work function for sodium is 150.6 kJ.mol-1.
Part B: How much energy is required to remove an electron from one sodium atom?
Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m.s-1. The work function for sodium is 150.6 kJ.mol-1.
Part B: How much energy is required to remove an electron from one sodium atom?
- Sat Oct 13, 2018 4:55 pm
- Forum: Properties of Electrons
- Topic: Module Photoelectric Effect
- Replies: 2
- Views: 203
Module Photoelectric Effect
Hi,
For this problem I'm not sure where to start would we use the mass of sodium and convert to moles? If someone could explain the process step by step that would help.
28. B. How much energy is required to remove an electron from one sodium atom?
For this problem I'm not sure where to start would we use the mass of sodium and convert to moles? If someone could explain the process step by step that would help.
28. B. How much energy is required to remove an electron from one sodium atom?
- Sat Oct 13, 2018 10:24 am
- Forum: Limiting Reactant Calculations
- Topic: Formula Units and Molecules
- Replies: 2
- Views: 894
Re: Formula Units and Molecules
Molecules and formula units essentially you could think about like the number of atoms. Formula units are used for ionic compounds whereas molecules are used for a compound with more than one element so if asked to solve number of formula units its the same process as solving for number of atoms.
- Thu Oct 11, 2018 9:40 pm
- Forum: Properties of Light
- Topic: Calculate values of n
- Replies: 2
- Views: 177
Calculate values of n
Hey guys, So I calculated the wavelength, but I don't know where to go from there. Problem 1A.15 7th edition. In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energ...
- Tue Oct 09, 2018 11:20 pm
- Forum: Properties of Light
- Topic: Photons
- Replies: 4
- Views: 152
Photons
Does increasing the intensity affect the number of photons that are emitted? Or is it increasing the frequency that affects the number of photons emitted?
- Tue Oct 09, 2018 11:18 pm
- Forum: Properties of Light
- Topic: Light
- Replies: 9
- Views: 897
Light
How does amplitude affect frequency? And what is the relationship between the wavelength and frequency?
- Fri Oct 05, 2018 10:28 pm
- Forum: Limiting Reactant Calculations
- Topic: M.9
- Replies: 2
- Views: 193
Re: M.9
That make sense! Thank you!
- Fri Oct 05, 2018 10:04 pm
- Forum: Limiting Reactant Calculations
- Topic: M.9
- Replies: 2
- Views: 193
M.9
Copper (II) nitrate reacts with sodium hydroxide to produce a precipitate of light blue copper(II) hydroxide. (a) Write the net ionic equation for the reaction. (b) Calculate the maximum mass of copper(II) hydroxide that can be formed when 2.00 g of sodium hydroxide is added to 80.0 mL of 0.500 M Cu...
- Thu Oct 04, 2018 11:18 pm
- Forum: Limiting Reactant Calculations
- Topic: Volume of Solution
- Replies: 2
- Views: 273
Volume of Solution
A student prepared a solution of sodium carbonate by adding 2.111g of the solid to a 250.0mL volumetric flask and adding water to the mark. Some of this solution was transferred to a buret. What volume of solution should the student transfer into a flask to obtain a. 2.15 mmol Na+ So I converted to ...
- Thu Oct 04, 2018 10:44 pm
- Forum: Limiting Reactant Calculations
- Topic: Calculating Maximum Mass
- Replies: 5
- Views: 1311
Re: Calculating Maximum Mass
I made a typo I did get Cu(OH)2. But I'm confused on part b.
- Thu Oct 04, 2018 10:42 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: HW L1
- Replies: 3
- Views: 156
Re: HW L1
For my answer I got 0.05 mol Br2. How I solved it was by using a mole to mole ratio from the balanced equation.
- Thu Oct 04, 2018 10:39 pm
- Forum: Limiting Reactant Calculations
- Topic: Calculating Maximum Mass
- Replies: 5
- Views: 1311
Calculating Maximum Mass
Problem M.9 Copper (II) nitrate reacts with sodium hydroxide to produce a precipate of light blue copper (II) hydroxide. (a) Write the net ionic equation for the reaction. (b) Calculate the maximum mass of copper (II) hydroxide that can be formed when 2.00 g of sodium hydroxide is added to 80.0mL of...
- Thu Oct 04, 2018 10:12 pm
- Forum: Empirical & Molecular Formulas
- Topic: Post-Module Assessment Q22
- Replies: 3
- Views: 333
Re: Post-Module Assessment Q22
After calculating the empirical formula you divide the molar mass of the compound by the empirical formula.
- Thu Oct 04, 2018 10:10 pm
- Forum: Empirical & Molecular Formulas
- Topic: Post-Module Assessment Q22
- Replies: 3
- Views: 333
Re: Post-Module Assessment Q22
You would divide by the smallest moles each element. Once you do so, you'll have to make sure they are whole numbers which could mean you have to multiply by a number that will give you whole numbers.
- Thu Oct 04, 2018 10:08 pm
- Forum: Limiting Reactant Calculations
- Topic: Determining Limiting Reagent [ENDORSED]
- Replies: 2
- Views: 643
Determining Limiting Reagent [ENDORSED]
How do we determine which reactant is the limiting reagent and excess from the balanced equation? For instance, if I was given something as 2A+3B yield 1C.
- Thu Oct 04, 2018 2:20 pm
- Forum: Balancing Chemical Reactions
- Topic: H3, coefficients
- Replies: 7
- Views: 664
Re: H3, coefficients
I feel as long as your final answer follows the Law of Conservation of Mass and you have the same amount of products and reactants it should be valid, but again don't quote me on that.
- Wed Oct 03, 2018 10:02 pm
- Forum: SI Units, Unit Conversions
- Topic: Formula Units??
- Replies: 3
- Views: 556
Re: Formula Units??
Formula units is the same process as solving for molecules or atoms. For an element it is referred to as atoms, compound it is referred to as molecule, and for an ionic compound it is referred to as formula units.
- Wed Oct 03, 2018 6:56 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting reactants product of moles
- Replies: 4
- Views: 716
Re: Limiting reactants product of moles
So first you would want to calculate the moles of reactants. Once you have the moles you can use the molar ratio from the balanced equation to see how many moles are required and figure which is your excess and limiting. Once you know that you can do a mole to mole ratio and mole to mass ratio. Hope...
- Wed Oct 03, 2018 6:52 pm
- Forum: Balancing Chemical Reactions
- Topic: Combustion
- Replies: 6
- Views: 617
Re: Combustion
A combustion reaction will always yield the products of CO2 and H2O.
- Tue Oct 02, 2018 11:03 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: stoichiometric terminology
- Replies: 3
- Views: 320
Re: stoichiometric terminology
Another way of thinking of formula units is simply number of atoms the difference is for an element it is referred to as atoms, but for an ionic compound it is referred to as formula units. They both measure the moles per mass.
- Tue Oct 02, 2018 11:03 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: stoichiometric terminology
- Replies: 3
- Views: 320
Re: stoichiometric terminology
Another way of thinking of formula units is simply number of atoms the difference is for an element it is referred to as atoms, but for an ionic compound it is referred to as formula units. They both measure the moles per mass.
- Tue Oct 02, 2018 7:44 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: number of moles, molecules, and formula units?
- Replies: 3
- Views: 371
Re: number of moles, molecules, and formula units?
An elements mass per mole is measured in atoms. A molecule is measured in mole per molecules. Formula units simply refers to a compound with a metal and nonmetal (ionic) which is then referred to formula units.
- Mon Oct 01, 2018 7:31 pm
- Forum: Balancing Chemical Reactions
- Topic: Balance Equation L.35
- Replies: 6
- Views: 1541
Balance Equation L.35
Hi, so for this problem after we balance each chemical equation how do we come up with the final balanced chemical equation? Sodium bromide, NaBr, which is used to produce AgBr for use in photographic film, can itself be prepared as follows. FeBr+Br2 ---> FeBr2 FeBr2+Br2---> Fe3Br8 Fe3Br8+Na2CO3-->N...
- Mon Oct 01, 2018 4:00 pm
- Forum: SI Units, Unit Conversions
- Topic: Naming Compounds
- Replies: 8
- Views: 588
Re: Naming Compounds
As to there being a short cut I'm not sure, but I would say memorizing the most common polyatomic ions.
- Mon Oct 01, 2018 3:57 pm
- Forum: Limiting Reactant Calculations
- Topic: Percent yield
- Replies: 10
- Views: 960
Re: Percent yield
The theoretical yield is found once you have done the limiting reagent calculations. So once you know which is the limiting reagent the theoretical yield is calculated by multiplying molar mass and number of moles of whichever product you are solving for.
- Sat Sep 29, 2018 10:46 pm
- Forum: Limiting Reactant Calculations
- Topic: Calculating Required Moles
- Replies: 2
- Views: 240
Calculating Required Moles
For the following equation, determine the limiting reagent if 21.4 g NH3 is reacted with 42.5 g of O2.
4NH3(g) + 5O2(g) ---> 4NO(g) + 6H2O(g)
So I calculated 0.266 mol O2 and 0.315 mol NH3. My question is if it is a 4 to 5 ratio how do we calculate the required moles?
4NH3(g) + 5O2(g) ---> 4NO(g) + 6H2O(g)
So I calculated 0.266 mol O2 and 0.315 mol NH3. My question is if it is a 4 to 5 ratio how do we calculate the required moles?
- Sat Sep 29, 2018 6:00 pm
- Forum: Empirical & Molecular Formulas
- Topic: Percent Composition
- Replies: 5
- Views: 623
Re: Percent Composition
Okay, thank you. Also, for part b why is the mass percentage of oxygen 4 sig figs? Since the smallest number of sig figs throughout the calculation I believe is 5.
- Fri Sep 28, 2018 7:46 pm
- Forum: Empirical & Molecular Formulas
- Topic: Percent Composition
- Replies: 5
- Views: 623
Percent Composition
I was browsing through Fundamentals F and I came across this question: (a) Write the formula for nitric acid. (b) Without doing a calculation, estimate which element in nitric acid occurs with the greatest mass percentage. So for part b, do we just assume that nitric acid (HNO3 I believe is the form...