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March 1, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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chemistry
2. Create a visual representation of ionic substances to connect the microscopic structure of ionic substances to each of the following macroscopic properties. a. Solubility in polar compounds (1 point) b. Brittleness (1 point) Please explain how to do this. I know they want ...
Saturday, February 7, 2015 at 6:46pm

chemistry
I am having some chemistry problems. 3. The graph compares the 1s orbital energies for the F atom (Z = 9), the Ne+ ion (Z = 10), and the Na++ ion (Z = 11). (the graph shows F having an Orbital Energy of 692.45, Ne+ with 47.74, and Na++ with 33.52) a. How many electrons does ...
Saturday, February 7, 2015 at 6:45pm

chemistry
Which of the following processes is entropy increasing in the local system? You may select multiple processes. Combination reactions where two reactants join to make a single product. a system with increasing molecular motion cooling a six-pack of beer by putting it in a ...
Saturday, February 7, 2015 at 5:48pm

chemistry
Which of the following reactions will be spontaneous at standard state? Not all the reactions are balanced, so make sure they are balanced first. The ΔG of formation data can be found in an appendix in your text book. You may select multiple answers. Any reaction with ...
Saturday, February 7, 2015 at 5:46pm

chemistry
ΔS is positive for which one of the following reactions? Ag+(aq) + Cl- (aq) = AgCl(s) N2(g) + 3H2(g) = 2NH3(g) CaO(s) + CO2(g) = CaCO3(s) 2SO3(g) = 2SO2(g) + O2(g) H2O(l) = H2O(s)
Saturday, February 7, 2015 at 5:45pm

chemistry
Suppose you have a reaction that has a ΔH of +80 kJ and a ΔS of 215 J/K. At what temperature will this reaction change from being not spontaneous to spontaneous? 31 C 99 C -18 C 25 C 53 C
Saturday, February 7, 2015 at 5:37pm

Chemistry
What is the molar absorption of a 9.8 x 10-6M solution of bilirubin dissolved in methanol having an absorbance of 0.600 when measured in 1.0 cm cuvette at 435nm?
Saturday, February 7, 2015 at 3:47pm

chemistry
Benzoic acid reacts with water to form the benzoate ion by the following reaction C6H5COOH(aq) + H2O(l) ⇀↽ C6H5COO−(aq) + H3O +(aq) The equilibrium constant for this reaction is 6.4 x 10−5 . In a 0.1 M solution of benzoic acid, what is the concentration...
Saturday, February 7, 2015 at 2:08pm

chemistry
A soluction of 100 mL of 0.2 M NH3 is titratedwith 50 mL of 0.5 M HNO3. What is the pH of the resulting solution? Kb for NH3 is 1.8 × 10−5 1. 5.30 2. 1.00 3. 1.48 4. 10.3
Saturday, February 7, 2015 at 2:08pm

chemistry
Which of the following has the HIGHEST pKa? 1. HClO3 2. HBrO 3. HClO 4. HIO 5. HClO4
Saturday, February 7, 2015 at 2:07pm

chemistry
What would be pH of a 0.01 M solution of a very expensive weak base, unobtainamine, whose pKb is 3.8? 1. 2.9 2. 14 3. 2 4. 7 5. 11.1
Saturday, February 7, 2015 at 2:06pm

chemistry
Arrange the acids I) hydrogen selenate ion (HSeO− 4 ), pKa = 1.92; II) phosphorous acid (H3PO3), pKa1 = 2.00; III) phosphoric acid (H3PO4), pKa = 2.12; IV) selenous acid (H2SeO3), pKa = 2.46; in increasing order of strengths. 1. IV, III, II, I 2. II, IV, III, I 3. I, III...
Saturday, February 7, 2015 at 2:06pm

chemistry
The term “Ka for the ammonium ion” describes the equilibrium constant for which of the following reactions? 1. NH3 + H2O ⇀↽ NH4 + + OH− 2. NH+ 4 + OH− ⇀↽ NH3 + H2O 3. NH3 + H3O + ⇀↽ NH+ 4 + H2O 4. NH+ 4 + H2O ⇀&#...
Saturday, February 7, 2015 at 1:41pm

chemistry
Which of the following is the STRONGEST acid? 1. CH3COOH 2. CH3CH2OH 3. CHCl2COOH 4. CH2ClCOOH 5. CCl3COOH
Saturday, February 7, 2015 at 1:41pm

Chemistry (Gen Chem 1)
Assume diameter of a neutral helium atom is 1.40x10^2pm. Suppose that we could line up helium atoms side by side in contact with one another. How many atoms would it take to complete the distance of 6.70cm from end to end?
Saturday, February 7, 2015 at 12:21pm

chemistry
A block of metal is 6.88 cm long, 2.03 cm wide, and 1.85 cm high. It has a mass of 215.1 grams. What is the density of this metal. I've tried adding all the cm up and squaring them, dividing them, multiplying but i can't get the answer
Friday, February 6, 2015 at 11:23pm

Chemistry
A tetrahedral site in a close-packed lattice is formed by four spheres at the corners of a regular tetrahedron. This is equivalent to placing the spheres at alternate corners of a cube. In such a close-packed arrangement the spheres are in contact and if the spheres have a ...
Friday, February 6, 2015 at 10:45pm

chemistry
2. Create a visual representation of ionic substances to connect the microscopic structure of ionic substances to each of the following macroscopic properties. a. Solubility in polar compounds (1 point) b. Brittleness (1 point)
Friday, February 6, 2015 at 10:38pm

Chemistry- Acid Base
What is the conjugate acid of O2^-2
Friday, February 6, 2015 at 9:45pm

Chemistry
After the volatile liquid has been added to the Erlenmeyer flask, the total pressure in the flask equals the vapor pressure of the volatile liquid. True or False?
Friday, February 6, 2015 at 8:49pm

chemistry due soon
I am having some chemistry problems. 3. The graph compares the 1s orbital energies for the F atom (Z = 9), the Ne+ ion (Z = 10), and the Na++ ion (Z = 11). (the graph shows F having an Orbital Energy of 692.45, Ne+ with 47.74, and Na++ with 33.52) a. How many electrons does ...
Friday, February 6, 2015 at 7:04pm

chemistry
a block of metal with dimensions of 5.6 cm and 11 cmm weights 5.55 kg.what is the density of the metal
Friday, February 6, 2015 at 6:56pm

Chemistry
A tetrahedral site in a close-packed lattice is formed by four spheres at the corners of a regular tetrahedron. This is equivalent to placing the spheres at alternate corners of a cube. In such a close-packed arrangement the spheres are in contact and if the spheres have a ...
Friday, February 6, 2015 at 6:55pm

math
A student’s final grade in chemistry is determined by the following weights: Quizzes 5% Exam 1 20% Exam 2 20% Lab Reports 15% Research Paper 15% Final Exam 25% The student received the following grades: Lab reports: 75 80 70 75 85 69 90 75 Quizzes: 85 60 70 0 75 80 80 80 ...
Friday, February 6, 2015 at 4:09pm

Chemistry
Is the reaction of 8 grams of natural gas and 38 grams of oxygen gas to form 17 grams of carbon dioxide in 19 grams of water consistent with the law of conservation of mass?
Friday, February 6, 2015 at 2:07pm

Chemistry
mixing 100ml of 0.015M Nah2PO4 and 100ml of NA2HPO4. What is the pH? This has got to be simple but why am I having trouble with it?
Friday, February 6, 2015 at 2:04pm

integrated chemistry and physics
In a water molecule, two hydrogen atoms bind to one oxygen atom. How many lone pairs of electrons will be shown around each hydrogen atom in the Lewis structure of water?
Friday, February 6, 2015 at 12:29pm

Chemistry
Copper is changed to copper(II) ions by nitric acid according to the following equation: 4HNO3 + Cu → Cu(NO3)2 + 2NO2 + 2H2O How many moles of HNO3 must react to produce 0.961 mol of NO2?
Friday, February 6, 2015 at 12:21pm

Chemistry
An original samplemof an unknown potassium chloride/potassium cholate mixture weighed 1.042g before heating and 0.943g after heating. How many grams of oxygen were released?
Friday, February 6, 2015 at 9:18am

chemistry
Are there formulas to solve the following problem? Complete the following table by replacing question marks with the correct numbers: (Note: Each horizontal row is a separate example, so in row #1, 175.32 grams of NaCl is how many moles of NaCl and how many molecules of NaCl ...
Friday, February 6, 2015 at 12:35am

Chemistry AP
Calculate the pH of a 0.44 M aqueous solution of NH4Cl. Kb = 1.8 × 10−5 . I've tried used the Ka=Kw/Kb equation then used the resulting 5.5e-10 in Kw=([H+][Cl-])/[NH4Cl] , using that to get the [H+], but it isn't correct and I don't know what else to do...
Thursday, February 5, 2015 at 11:07pm

Chemistry AP
Calculate the pH of a 0.44 M aqueous solution of NH4Cl. Kb = 1.8 × 10−5 . I've tried used the Ka=Kw/Kb equation then used the resulting 5.5e-10 in Kw=([H+][Cl-])/[NH4Cl] , using that to get the [H+], but it isn't correct and I don't know what else to do.
Thursday, February 5, 2015 at 10:27pm

chemistry
4. A sulfuric acid solution containing 571.6 g of H2SO4 per liter of solution has a density of 1.329 g/cm3 . Calculate a. The mass percentage b. The mole fraction c. The molality d. The molarity of H2SO4 in this solution
Thursday, February 5, 2015 at 9:50pm

chemistry
The density of acetonitrile, CH3CN, is 0.786 g/mL, and the density of methanol, CH3OH, is 0.791 g/mL. A solution is made by dissolving 15.0 g of methanol in 250.0 mL of acetonitrile. Assuming that the volumes of the solute and solvent are additive, what is the molarity of ...
Thursday, February 5, 2015 at 9:47pm

chemistry
The Henry's law constant for CO2 is 3.1 x 10-2 mol/L-atm at 25°C. What pressure would be necessary in order to have a .25 M solution?
Thursday, February 5, 2015 at 9:46pm

chemistry
The Henry’s Law constant for N2 in water at 30 oC is 6.0 x 10-4 M/atm, calculate the solubility of nitrogen gas in water at a partial pressure of 2.5 atm
Thursday, February 5, 2015 at 9:45pm

Chemistry
which one has more entropy? A mole of nitrogen gas at STP or a mole of nitrogen gas at 200 K have?
Thursday, February 5, 2015 at 7:48pm

Chemistry
Because of the changing color of the solution as the following reaction proceeds, the rate law can be determined by measuring the rate of disappearance of the permanganate ion (MnO4-). 2MnO4-(aq)+ 5H2C2O4(aq) + 6H+(aq) -> 2Mn2+(aq) + 10CO2(g) + 8H2O(l) The following initial...
Thursday, February 5, 2015 at 6:24pm

Science - chemistry
Hi Im in year 7 and to get a level 6 we have to explain the big idea of energy. Our project is about the reation of iron and sulphur to make iron sulphide. We have been told to explain using the big idea of energy. pls help me asap!!!!
Thursday, February 5, 2015 at 3:56pm

chemistry
What physical property of water and HCl allows us to separate them from the zinc chlorine compound produced in the reaction?
Thursday, February 5, 2015 at 3:54pm

chemistry
the Ksp of Bi2s3 at room temmperature is 1.60x10-72, what is its solubility in g/100 ml? Please help me with the solution. Our teacher haven't discussed this yet so I have no idea how to solve this.. and if i ever got the answer with your solution. could you please check ...
Thursday, February 5, 2015 at 3:08pm

CHEMISTRY
calculate the ksp of Ag2SO4 with a solubility of 1.20x10-6 g/L. so my prof told me that ksp is in mol/l what i did is convert it to mol/l by dividing 1.20x10-6 to mw of ag2s04 which is 312. (=3.85x10-9) ag2s04= 2ag+so4+2 (i balanced it) Ag2SO4= [2(3.85x10-9] 2(squared) [3....
Thursday, February 5, 2015 at 3:02pm

chemistry
what is shorthanded configuration of Mg and Cl
Thursday, February 5, 2015 at 2:11pm

chemistry
A gas sample occupies a volume of 400.0ml at 298.15k at costant pressure. what is the final temperature when the volume occupied decreased by 39.0
Thursday, February 5, 2015 at 6:31am

Chemistry
A student was required to prepare 250.0 mL of a hypochlorous acid/sodium hypochlorite buffer in which the concentration of the weak acid component was 0.073 M and the concentration of the conjugate base was 0.046 M. The student was supplied with 0.365 M hypochlorous acid and 1...
Thursday, February 5, 2015 at 4:55am

Chemistry
The pH of a 25.0 mL sample of a buffer changed by one unit when 4.19 mL of 0.24 M HCl was added to it. What is the acid buffer capacity of this buffer?
Thursday, February 5, 2015 at 4:55am

chemistry
What must be the minimum concentration of dichloroacetic acid in 1.00L buffer solution of a pH 0.91 dichloroacetic acid/sodium dichloroacetate buffer if the pH changes by 0.2 units when 0.057 moles HCl are added? Dichloroacetic Cl2CHCOOH ka= 5.50E-02 pka= 1.26
Thursday, February 5, 2015 at 4:54am

Chemistry
Arrange the following compounds in order of decreasing ease of elution from a column of silica gel: a) 2-octanol; b) 1,3-dichlorobenzene; c) tert-butylcyclohexane; d) benzoic acid
Thursday, February 5, 2015 at 2:06am

Chemistry
Upon decomposition, one sample of magnesium fluoride produced 1.55 kg of Magnesium and 2.42 kg of fluoride. A second sample produced 1.10kg of magnesium. How much fluoride (in grams) did the second sample produced?
Thursday, February 5, 2015 at 1:53am

chemistry
If 15.0 grams of C3H6, 10.0 grams of oxygen, and 5.00 grams of NH3 are reacted, what mass of acrylonitrile can be produced assuming 100% yield, what mass of the excess reactants remain? 15g C3H6 (1 mol / 42.08 g) = .35 mol C3H6 .36 mol C3H6 ( 2 mol C3H3N / 2 mol C3H6) = .36 ...
Thursday, February 5, 2015 at 1:24am

chemistry
Given the following values of ΔH, ΔS and T, calculate ΔG (in kJ). The values are: ΔH = 23.0 kJ, ΔS = 125 J/K, and temperature = 85.0 C.
Thursday, February 5, 2015 at 12:54am

Chemistry
1. If an aqueous solution that is 0.15 M in HF has an osmotic pressure of 3.9 atm at 25oC, what is the percent ionization of HF at this concentration? 2. A mixture of 2 volatile liquids is said to be ideal if each component obeys Raoult’s Law: Pi=XiPio Two volatile ...
Wednesday, February 4, 2015 at 11:23pm

Chemistry
Arrange the following compounds in order of decreasing ease of elution from a column of silica gel: a) 2-octanol; b) 1,3-dichlorobenzene; c) tert-butylcyclohexane; d) benzoic acid
Wednesday, February 4, 2015 at 10:33pm

Chemistry
What precautions must be taken when you introduce a mixture of compounds to be separated onto a liquid chromatography adsorbent column?
Wednesday, February 4, 2015 at 9:39pm

Chemistry
Once the adsorbent is packed in a liquid chromatography column, it is important that the level of the elution solvent not drop below the top of the adsorbent. Why?
Wednesday, February 4, 2015 at 9:39pm

Chemistry
What precautions must be taken when you introduce a mixture of compounds to be separated onto a liquid chromatography adsorbent column?
Wednesday, February 4, 2015 at 8:38pm

Chemistry
Once the adsorbent is packed in a liquid chromatography column, it is important that the level of the elution solvent not drop below the top of the adsorbent. Why?
Wednesday, February 4, 2015 at 8:37pm

Chemistry
the titration of an ascorbic acid requires 18.5 mL of .0105 M KIO3. how many mmol of ascorbic acid were in this sample?
Wednesday, February 4, 2015 at 8:04pm

chemistry
a pool is 39.8 m long and 28.2 m wide. if the average depth of water is 4.90 ft, what is the mass (in kg) of water in the pool? enter your answer in scientific notation. the density of water is 1.0 g/mL
Wednesday, February 4, 2015 at 6:32pm

Chemistry
Calculate the ΔHrxn for the following reactions using the heats of formation given in the table at the end of this assignment: a)The complete combustion of methane, CH4, producing water as a liquid. b)The complete combustion of glucose, C6H12O6, producing water as a ...
Wednesday, February 4, 2015 at 5:23pm

Chemistry
Which of the following is an example of a double-displacement reaction? AlCl3 + 3 NaOH → Al(OH)3 + 3 NaCl Na2O + H2O → 2 NaOH CuCO3 → CuO + CO2 None of the above are examples of double-displacement. A Which of the following is a double-displacement reaction...
Wednesday, February 4, 2015 at 5:10pm

chemistry
What is the hydrocarbon that will not form an additional polymer A compound which is not a hydrocarbon but will form an additional polymer
Wednesday, February 4, 2015 at 4:09pm

Chemistry
a sample of radioisotope has a count rate measured by a Muller-Geiger counter of 160 counts per minute. this drop to 20 counts per minute in 1 hour. What is the half life of this source.
Wednesday, February 4, 2015 at 3:31pm

Chemistry
If 3.0 liters of oxygen gas react with excess carbon monoxide at STP, how many liters of carbon dioxide can be produced under the same conditions? 2 CO (g) + O2 (g) ---> 2 CO2 (g)
Wednesday, February 4, 2015 at 2:20pm

Chemistry
If a temperature increase from 11.0∘C to 22.0∘C doubles the rate constant for a reaction, what is the value of the activation barrier for the reaction?
Wednesday, February 4, 2015 at 1:22pm

chemistry
The question is: What statements are true for the standard entropy change for the conversion of ozone to oxygen? The choices to pick from are: 1. Molecular factors predict an increase in entropy 2. Stoichiometric factors predict a decrease in entropy. 3. Molecular factors ...
Wednesday, February 4, 2015 at 11:25am

chemistry
In an adiabatic calorimetry experiment, 100 mL of 0.500 M HCl was added to 100 mL 0.500 M NaOH to produce 200 mL 0.25 M NaCl. A temperature increase of 3.38 °C was measured. Calculate the heat of reaction associated with this process at 25 °C from the data in Table 1...
Wednesday, February 4, 2015 at 11:23am

Chemistry
The ksp for Ce(IO3)3 is 3.2E-10. What is Ce^3+ concentration in a solution prepared by mixing 60ml of 0.025M Ce^3+ with 40ml of 0.045M IO3^-?
Wednesday, February 4, 2015 at 5:29am

Chemistry Please help !
Carbon tetrachloride contains one carbon and four chlorine atoms. For this compound 11.818 g of chlorine combine with 1.000 g of C-12. Using this information, calculate the atomic mass of chlorine.
Wednesday, February 4, 2015 at 4:02am

chemistry
I need to do this question but um unable to draw the enthalpy cycle please help me. The standard enthalpy of combustion of C3H7OH(l), C(s,graphite) and H2(g) are -1300,-393, and -286 kJmol-1. Calculate the standard enthalpy of formation of C3H7OH(l)
Wednesday, February 4, 2015 at 1:34am

Chemistry due soon
I am having some chemistry problems. 3. The graph compares the 1s orbital energies for the F atom (Z = 9), the Ne+ ion (Z = 10), and the Na++ ion (Z = 11). (the graph shows F having an Orbital Energy of 692.45, Ne+ with 47.74, and Na++ with 33.52) a. How many electrons does ...
Tuesday, February 3, 2015 at 11:34pm

chemistry
What happens when calcium is inserted in a gas jar of nitrogen? How will you test the product formed?
Tuesday, February 3, 2015 at 11:28pm

chemistry
What happens when calcium is inserted in a gas jar of nitrogen.? How will you test the product formed
Tuesday, February 3, 2015 at 11:27pm

chemistry
How to test calcium nitride.? ( ca3n2) when calcium reacts with nitrogen , Calcium nitride is formed. How can we test that the product formed is calcium nitride?
Tuesday, February 3, 2015 at 10:26pm

Chemistry
Cola drinks have a phosphoric acid content that is described as `from 0.057% to 0.084% of 75% phosphoric acid, by mass." Estimate the pH range of cola drinks corresponding to this average range of H3PO4 content. I am having trouble with the wording of this question, I ...
Tuesday, February 3, 2015 at 10:16pm

Chemistry
Calculate the amount of heat required to heat a50kg sample of ethanol from 13.0∘C to 18.0∘C Specific heat capacity of ethanol is 2.42 J/g∘C.? Please help
Tuesday, February 3, 2015 at 10:09pm

chemistry
1. Write the electron configuration for each atom or ion. Then explain the distribution of electrons among energy levels. Ca, Be2+, and Br- I already found the electron configurations but I don't understand the second part of the question.(Then explain the distribution of ...
Tuesday, February 3, 2015 at 9:37pm

chemistry
I am having some chemistry problems. 3. The graph compares the 1s orbital energies for the F atom (Z = 9), the Ne+ ion (Z = 10), and the Na++ ion (Z = 11). (the graph shows F having an Orbital Energy of 692.45, Ne+ with 47.74, and Na++ with 33.52) a. How many electrons does ...
Tuesday, February 3, 2015 at 9:33pm

Organic Chemistry TLC Chromatography
If you have 5.6 ml of 95:5 ethyl acetate, how many ml of 85:15 ethyl acetate can you make? Assume unlimited supply of pure ethyl acetate.
Tuesday, February 3, 2015 at 9:23pm

chemistry
A method for scrubbing CO2(g) from the air on a spacecraft is to allow CO2(g) to react with NaOH according to the following (unbalanced reaction). NaOH(s) + CO2(g) → Na2CO3(s) + H2O(l) Use the appropriate thermodynamic tables to calculate the enthalpy, entropy and ...
Tuesday, February 3, 2015 at 6:16pm

Chemistry
The coinage metals -- copper, silver, and gold -- crystallize in a cubic closest packed structure. Use the density of gold (19.3 g/cm3) and its molar mass (197 g/mol) to calculate an approximate atomic radius for gold. Work So Far: {[1/(19.3x197)]x.74}/6.022e23 =3.2319e18 [(3....
Tuesday, February 3, 2015 at 4:14pm

Chemistry
Benzene has a vapor pressure of 183 mm Hg at 40 degrees Celsius. Taking it's heat of vaporization to be 30.8 kJ/mol, calculate it's vapor pressure at 25 degrees Celsius. The answer is 101 mm Hg, but I keep getting 4.613, and I can't figure out where 101 mm Hg comes...
Tuesday, February 3, 2015 at 3:07pm

chemistry
Need help stepping through this for a review. I need to prepare 40grams of a 29% sugar solution. How do I calculate how much sugar and how much water is needed? Was given this formula: weight% (w/w)=100 * (mass of solute/total mass of solution) I set up my problem: .29 = 100...
Tuesday, February 3, 2015 at 2:09pm

chemistry
Given the following values of ΔH, ΔS and T, calculate ΔG (in kJ). The values are: ΔH = -95.0 kJ, ΔS = 217 J/K, and temperature = 160 C.
Tuesday, February 3, 2015 at 12:50pm

chemistry
How many core electrons are there in a ground state phosphorus atom?
Tuesday, February 3, 2015 at 12:09pm

chemistry
How can you test calcium nitride.. ( Ca3N2) I have written the reaction between calcium and nitrogen. A question that says " how will you test the product formed " is given. SO can you please help me, How can you test calcium nitride?
Tuesday, February 3, 2015 at 11:28am

General Chemistry
1,When aqueous sodium hydroxide is added to a solution containing lead(II) nitrate, a soHowever, when additional aqueous hydroxide is added the precipitate redissolves forming a soluble [Pb(OH)4]2–(aq) complex ion.lid precipitate forms. 2,The Ksp of strontium carbonate, ...
Tuesday, February 3, 2015 at 5:26am

Chemistry
The temperature of an object increases by 44.9 °C when it absorbs 3871 J of heat. Calculate the heat capacity of the object.
Tuesday, February 3, 2015 at 2:56am

Chemistry
How much ethylene glycol (C2H6O2, the major component of antifreeze) must be added to 1 L of water to keep it from freezing at -20 oC? Kf = 1.86 oC/m.
Tuesday, February 3, 2015 at 12:50am

chemistry
A buffer solution is made by dissolving 0.45 moles of a weak acid (HA) and 0.13 moles of KOH into 760 mL of solution. What is the pH of this buffer? Ka = 3.3 × 10−6 for HA.
Monday, February 2, 2015 at 10:13pm

chemistry
For the equilibrium below at 400 K, Kc = 7.0. Br2(g) + Cl2(g) equilibrium reaction arrow 2 BrCl(g) If 0.85 mol of Br2 and 0.85 mol Cl2 are introduced into a 2.0 L-container at 400. K, what will be the equilibrium concentrations of Br2, Cl2 and BrCl? I tried to set it up and ...
Monday, February 2, 2015 at 10:13pm

chemistry
The fluorocarbon compound C2Cl3F3 has a normal boiling point of 47.6 ∘C. The specific heats of C2Cl3F3(l) and C2Cl3F3(g) are 0.91 J/g⋅K and 0.67 J/g⋅K, respectively. The heat of vaporization for the compound is 27.49 kJ/mol. Calculate the heat required to ...
Monday, February 2, 2015 at 9:53pm

chemistry
After you carefully lower each cube into the water of its own cylinder, what will the new water level be in the cylinder with the lead cube?
Monday, February 2, 2015 at 8:09pm

Chemistry
A certain reaction has an activation energy of 58.80 kJ/mol. At what Kelvin temperature will the reaction proceed 6.50 times faster than it did at 303 K?
Monday, February 2, 2015 at 7:49pm

Chemistry
Balance Fe2O3 + CO--> Fe + CO2
Monday, February 2, 2015 at 7:45pm

Chemistry
Your computer monitor has a width of 14.56 inches and a height of 10.92 inches. What is the area of the monitor display in square meters?
Monday, February 2, 2015 at 7:31pm

Chemistry
What is the mass, in grams, of a pure iron cube that has a volume of 4.30 cm3?
Monday, February 2, 2015 at 7:29pm

Organic Chemistry
If you have 5.6 mL of 95% hexanes to 5% ethyl acetate, how many mL of 85% hexanes to 15% ethyl acetate can you make? Assume unlimited supply of pure ethyl acetate.
Monday, February 2, 2015 at 7:01pm

Inorganic Chemistry
Use Slater's rules to calculate the effective nuclear charge, Z* or Zeff, for a 4f electron in Eu, Tb, and Dy.
Monday, February 2, 2015 at 7:00pm

Chemistry
for the titration of n.89g of an uk diaprotic acid with .2500 N sodium hydroxide, it took 35.5 mL to reach the phenolphthalein endpoint, calculate the molar mass.
Monday, February 2, 2015 at 6:39pm

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