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November 26, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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College Chemistry II
What is the pH of rainwater at 30C in which atmospheric Co2 has dissolved, producing a constant [H2Co3] of 1.40x10^-5 M? Take into account the auto ionization of water. Im very confused on how to even start this problem
Sunday, August 10, 2014 at 5:03pm

chemistry
f 8.77 g of KI are dissolved in enough water to make 4.75 L of solution, what is the molarity of the solution?
Sunday, August 10, 2014 at 4:54pm

math
In a high school, 30% of student take physics, 15% of students take chemistry. The rest of students are taking biology. What is minimum student taking biology? A.7 B.8 C.9 D.10 E.11
Sunday, August 10, 2014 at 4:20pm

College Chemistry II
What is the solubility of ZnCO3 at 25C in a buffer solution with a pH of 10.21? ZnCO3 <----> Zn++ + CO3 – - CO3-- + H2O ----> HCO3- + OH- pOH = 14 – 10.21 = 3.79 [OH-] = 1.62x10^-4 M = [CO3--] = [Zn++] Ksp = [Zn++][CO3-] = (1.62x10^-4)( 1.62x10^-4) = 2.63x10...
Sunday, August 10, 2014 at 3:35pm

chemistry
express the following in exponential notation : (a) 0.0030
Sunday, August 10, 2014 at 9:08am

Chemistry
Calculate the adiabatic flame temperature of burning CH4 (g) at 1 atm when burned with 50% excess air, and the reactants enter at 25oC. Standard heat of formation: Ch4: Hr = -49.963kj/mol CO2: Hr = - 393.25 kJ/mol H20(g) : Hr = - 241.835 kj/mol Heat capacities (J/mol), T in oC...
Sunday, August 10, 2014 at 12:53am

chemistry
What are the element in leaf ?
Friday, August 8, 2014 at 9:53pm

Chemistry
Can you please explain if it would be possible to calculate the K value if more than one product or reactant in a chemical equation is a gas?
Friday, August 8, 2014 at 2:56pm

Chemistry 2
Calculate the molarity of the following aqueous solution of 25.0 grams of MgBr2 in 0.355 L solution? Did I work this right? 25gMgBr2/184.113 gMgBr2 =.1357861748 mol MgBr2 then: .1357861748 mol MgBr2/0.355 L =.382 M
Friday, August 8, 2014 at 2:29pm

Chemistry
Suppose a scientist is doing an experiment to determine the effent of a cancer drug on mice with lymphoma. a)What are some of the variables the scientist should control in the experiment? b)Describe the control group for this experiment. a) I want to say the cancer drug and ...
Friday, August 8, 2014 at 2:16pm

chemistry
A 25 mL solution of nitric acid was placed in a flask and a few drops of phenolphthalein were added. Dilute sodium hydroxide was added util the indicator changed colour. It was found that 28 mL of the alkali was used. (a) What colour was the solution in the flask at the start ...
Thursday, August 7, 2014 at 11:09pm

Chemistry
If 5.4 moles of methane react with 3.5 moles of oxygen gas, how much carbon dioxide will be produced? Use the following equation: CH4 + 2O2 = CO2 + 2H20
Thursday, August 7, 2014 at 10:24pm

Chemistry
HNO3 used as a reagent has a specific gravity of 1.42 g/ mL and contains 70% by strength HNO3. Calculate: Volume of acid that contains 60 g pure acid? Volume of water required to make 1 molar solution from 2 mL concentrated HNO3?
Thursday, August 7, 2014 at 3:22pm

Physical chemistry
A mixture contains n2o4 and No2 in the ratio 2:1 by volume what is the vapour density of the mixture.Pls answer the question i have been on the question for 2 hrs by now tried solving using mole fraction ideal gas equation an using the formula molar mass /2 but still couldn&#...
Thursday, August 7, 2014 at 1:51pm

Chemistry
I am to do an equilibrium constant lab and I am supposed to only find the Kc value. i have to find the equilibrium constant for NaHCO3 (s) <--> NaOH (s) + CO2 (g) at 800K. The partial pressure in the bulb reads 420 kPa on the manometer, 1 gram of NaHCO3 was added to the ...
Thursday, August 7, 2014 at 12:24pm

Chemistry
A 10.00-mL sample of 0.1000 M KH2PO4 was titrated with 0.1000 M HCl Ka for phosphoric acid (H3PO4): Ka1= 7.50x10-3 ; Ka2=6.20x10-8 ; Ka3= 4.20x10-10 Calculate the pH after addition of 10.00 mL of HCl to the KH2PO4 solution?
Thursday, August 7, 2014 at 3:11am

chemistry -repost
Still can't figure this one out-- sorry for reposting, this is the last post, if someone has time to review this question and see if they can figure out how the textbook got 1.0x10^-7 seconds Iodine combines to form I2 in liquid propane solvent with a constant of 1,5 x 10...
Wednesday, August 6, 2014 at 3:27pm

Chemistry
If 0.896 g of a gas occupies a 250 mL flask at 20 degrees Celsius and 760 mm Hg of pressure, what is the molar mass of the gas?
Tuesday, August 5, 2014 at 12:17am

Organic Chemistry
Rank the following compounds in order of increasing acidity. a. H2O, H3O-, Ho- == HO-, H2O, H3O- b. NH3
Monday, August 4, 2014 at 10:49pm

Chemistry
Iodine combines to form I2 in liquid propane solvent with a constant of 1,5 x 10^10 L/mol. The rate is 2nd order. Since the reaction occurs quickly, a flash of light creates an I concentration of .0100M. How long will it take for 95% of the atoms to form I2? This must use a ...
Monday, August 4, 2014 at 10:28pm

math hw
10.Thirty students in a chemistry class took a test on which the overall average score was 78. If the average score for 15 of those students was 85, what was the average score for the remaining members of the class? I know that "average" means dividing, but i'm ...
Monday, August 4, 2014 at 7:49pm

chemistry
What is a Reaction that you would expect when acetylsalicylic acid (aspirin) is heated in the presence of a CONCENTRATED acid? Thanks in advance!
Monday, August 4, 2014 at 2:49pm

Chemistry
Im studying for the MCAT and i found this question in my old chem book. i can't figure out how to derive the formula they are talking about... Nitrogen monoxide reacts with oxygen to give nitrogen dioxide. 2 NO(g)+ O2(g) --> 2 NO2(g) The rate law is -[NO]/&#...
Monday, August 4, 2014 at 1:31pm

Chemistry
Im studying for the MCAT and i found this question in my old chem book. i can't figure out how to derive the formula they are talking about... Nitrogen monoxide reacts with oxygen to give nitrogen dioxide. 2 NO(g)+ O2(g) --> 2 NO2(g) The rate law is -[NO]/&#...
Monday, August 4, 2014 at 1:30pm

Chemistry
I need help i do not know how to do this problem at all. A 30.00 mL sample of 0.1500 M hydroazoic acid (HN3; Ka = 1.9 x 10-5) is titrated with 0.1000 M KOH. Calculate the pH after the following volumes have been added:
Monday, August 4, 2014 at 1:13pm

Chemistry
What is dS (J/K) of the process when 0.5874 moles of H2 gas are compressed from 37.13 L to 29.13 L at constant temperature?
Monday, August 4, 2014 at 1:05pm

chemistry
Iodine combines to form I2 in liquid propane solvent with a constant of 1,5 x 10^10 L/mol. The rate is 2nd order. Since the reaction occurs quickly, a flash of light creates an I concentration of .0100M. How long will it take for 95% of the atoms to form I2? This must use a ...
Monday, August 4, 2014 at 9:36am

chemistry
KNO3+H2SO4=K2SO4+HNO what mass of sulfuric acid in gram is needed for 2 moles of potassium nitrate? how many moles of mitric acid will be produced from 5 moles of sulfuric acid? what mass in gram of potassium sulfate will be produced from 5 moles of potassium sulfate?
Sunday, August 3, 2014 at 9:58pm

chemistry
how many moles of potassium sulfate are produced for each mole of potassium nitrate?
Sunday, August 3, 2014 at 9:04pm

Chemistry
2Na + 2H2O------> 2NaOH + H2 H=-386kJ If 5g of sodium is added to 200g of water in an open container: (A) How much heat is absorbed/released int he reaction? (B)What volume in formed at 22C and 102kPa? (C) If boiling point elevation constant is 0.52K molal what is the ...
Sunday, August 3, 2014 at 6:29pm

Chemistry
A solution made up of 1.00 M NH3 and 0.500 M (NH4)2SO4 has a pH of 9.26. a. Write the net ionic equation that represents the reaction of this solution with a strong acid. b. Write the net ionic equation that represents the reaction of this solution with a strong base. c. To ...
Sunday, August 3, 2014 at 3:58pm

Chemistry
A chemist wants to prepare phosgene, COCl2, by the following reaction: CO(g) + Cl2(g) COCl2(g) He places 2.60 g of chlorine, Cl2, and an equal molar amount of carbon monoxide, CO, into a 10.00 L reaction vessel at 395 °C. After the reaction comes to equilibrium, he adds ...
Sunday, August 3, 2014 at 2:33pm

Chemistry
If you increase the number of moles of gas in a fixed volume container kept as a constant temperature. What happens?
Saturday, August 2, 2014 at 2:14pm

Chemistry- practice question
The answer for this question is ΔHrxn=-441.40174468085 kJ/mol but I don't know how to arrive to that answer. 0.47g of magnesium reacts with 100ml of 1.00 mol/L HCl in the following reaction: Mg(s)+2HCl(aq)-->MgCl2(aq)+H2(g). The heat of reaction is -8537.4J ...
Friday, August 1, 2014 at 2:53pm

Chemistry
The volume of a gas is 76cm3 at 27c and 800mm mercury pressure.what is the volume at s.t.p
Friday, August 1, 2014 at 8:30am

first chemistry
Salicylic acid reacts with acetic anhydride to produce the analgesic drug aspirin and acetic acid. Using a periodic table, calculate the molecular weight of aspirin to 2 decimal places.
Friday, August 1, 2014 at 1:34am

chemistry
If 3.65 g of a compound having a molecular weight of 481.93 g mol-1 is dissolved in water to make a final volume of 142 mL, what is the concentration of the solution in mM? Answer to three significant figures.
Friday, August 1, 2014 at 1:26am

Chemistry
For :H2O(g) --> H(g) + OH(g); At 3000K and P(total)=1.00 atm, from your K value calculate system composition from 1.00 mol H2O(g) and no products initially. The K I got (using Delta G superscript zero = [Delta H superscript zero]-[T* Delta S superscript zero)=]) was 9.5x10...
Thursday, July 31, 2014 at 11:24pm

Chemistry / help
An equal mass of which of the following states of matter could completely fill both a 100 mL or 500 ml container? A. Gas B. Liquid C. Mixture D. Solid
Thursday, July 31, 2014 at 7:57pm

chemistry
a) Calculate the percent ionization of 0.125M lactic acid (Ka=1.4x10^-4) b) Calculate the percent ionization of 0.125M lactic acid in a solution containing 0.00075 M sodium lactate.
Thursday, July 31, 2014 at 12:23pm

Chemistry
Calculate PH of 0.05 M solution of ammonium acetate
Thursday, July 31, 2014 at 5:22am

CHEMISTRY
A mixture of methane and helium is placed in a 2.0 l flask at 27 degrees the partial pressure of methane is 0.72 ATM and the partial pressure of helium is 0.22 ATM . What is the mole fraction of ch4?
Wednesday, July 30, 2014 at 9:48pm

Chemistry
In order to make 500.0mL of a 1.835 M MgCl2 solution, then _______g of MgCl2 is needed. Moles of MgCl2= (1.835M)(0.5L)=0.9175mol Molecular Weight of MgCl2= 95.211 g/mol (0.9175mol MgCl2)(95.211 g/mol)= 87.36g of MgCl2 Did I do this correct?
Wednesday, July 30, 2014 at 7:59pm

chemistry
A sample of nitrogen gas has the temperature drop from 250°C to 150°C at constant pressure. What is the final volume if the initial volume is 310 mL?
Wednesday, July 30, 2014 at 7:50pm

inorganic chemistry
A large number of hydrogen atoms have electrons to the n=4 state.How many possible spectral lines can appear in the emission spectrum as a result of the electron reaching the ground state(n1=1).Diagram all possible pathways for de excitation from nh=4 to nh=1
Wednesday, July 30, 2014 at 7:28pm

chemistry
Which statement is false? The average kinetic energies of molecules from samples of different “ideal” gases is the same at the same temperature. Molecules of a gas undergo many collisions with each other and the container walls. All molecules of an ideal gas have the...
Wednesday, July 30, 2014 at 7:00pm

Chemistry
1. In order to make 250mL of a 0.100 M HNO3 solution from a 15.9 M stock solution, then _____mL if the 15.9 M stock HNO3 solution is needed. M1V2=M2V2, solve for V2. (0.100M * 250mL)/ 15.9M = 1.6mL V2-V1=V 1.6mL-250= -248.4 Did I do this correctly?
Wednesday, July 30, 2014 at 6:15pm

chemistry
consider the reaction 2NaF if you begin with 4.8 mol S and 2.6 mole F, what is the limiting reactant and theorical yield of NaF in moles
Wednesday, July 30, 2014 at 10:57am

Chemistry
how would you prepare 250 mL of 0.69M Al2(SO4)3 solution from a 2.0M Al2(SO4)3 stock solution?
Wednesday, July 30, 2014 at 10:21am

Chemistry
DECOMPOSITION OF NO2 (10/10 points) The decomposition of NO2 at room temperature exhibits the following variation in concentration with time: The concentration of NO2 is expressed in mol/liter, while time is expressed in seconds. [NO2] ln[NO2] 1/[NO2] Time (s) 0.0831 -2.4877 ...
Wednesday, July 30, 2014 at 9:57am

Chemistry
If the sign for delta G is negative (spontaneous process) and sign for delta S is positive (more disorder) for both dissolving processes, how could one be endothermic (positive delta H- NaNO3 dissolves in water) and one be exothermic (negative delta H- NaCH3COO dissolves in ...
Wednesday, July 30, 2014 at 2:23am

Chemistry
Using Hess’s Law with the following data: N2(g) + O2(g) = 2NO(g) Del(H) = 180.7kj 2NO(g) + O2(g) = 2NO2(g) Del(H)= -113.1kj 2N2O(g) = 2N2(g)+ O2(g) Del(H)=-163.2kj Calculate Del(H) for the reaction: N2O(g) + NO2(g) = 3NO(g)
Tuesday, July 29, 2014 at 11:22pm

Chemistry
Calculate the standard enthalpy change for the following reaction at 25 °C.? 2CH3 OH(g) + 3O2(g) -------- 2CO2(g) + 4H2O (g)
Tuesday, July 29, 2014 at 7:42pm

chemistry
You have a 1.0 M stock solution of H2SO4 in a large flask. You need to dilute this to make a 0.25M solution of H2SO4 for an experiment. If you need exactly 100.0mL of the diluted solution, how would you make the diluted solution?
Tuesday, July 29, 2014 at 3:08pm

Writing
Please give me a score of 1-6 (one being poor and six being excellent). Also, please give me some feedback! Thank you in advance! Essay prompt: What motivates people to change? Essay: Many people know that eating junk food is unhealthy. Yet, they keep eating it because it ...
Tuesday, July 29, 2014 at 1:14pm

Chemistry
how would you prepare 250 ml of 0.69m al2(so4)3 solution from a 2.0 al2(so4)3 stock solution
Tuesday, July 29, 2014 at 11:34am

Chemistry
A 30.00 mL sample of 0.1500 M hydroazoic acid (HN3; Ka = 1.9 x 10-5) is titrated with 0.1000 M KOH. Calculate the pH after the following volumes have been added: a. 0.00 mL b. 11.25 mL c. 22.50 mL d. 33.75 mL e. 45.00 mL f. 56.25 mL
Tuesday, July 29, 2014 at 10:35am

Chemistry
According to the experiment procedure, given that the NaOH solution has a concentration of 0.100M, and that the vinegar (acetic acid) has a concentration of 5.0%m/m (mass percent), what volume(mL) of titrant would be required to reach the "equivalence point", if you ...
Tuesday, July 29, 2014 at 8:09am

SAT WRITING
Please give me a score of 1-6 (one being poor and six being excellent). Also, please give me some feedback! Thank you in advance! Essay prompt: What motivates people to change? Essay: Many people know that eating junk food is unhealthy. Yet, they keep eating it because it ...
Tuesday, July 29, 2014 at 12:42am

Chemistry
Will the following reactions mixed together cause a precipitate reaction, released gas reaction, or no reaction. Ba(NO3)2 mixed with NaCl Ba(NO3)2 mixed with HCl Ba(NO3)2 mixed with Na2CO3 Ba(NO3)2 mixed withNa3SO4 also Ba(NO3)2 is soluble and a solid and HCl is a gas. Is ...
Monday, July 28, 2014 at 11:12pm

chemistry
what mass of water must react with calcium carbide for 3.9g of acetylene gas to form?
Monday, July 28, 2014 at 10:40pm

SAT Writing
Please give me a score of 1-6 (one being poor and six being excellent). Also, please give me some feedback! Thank you in advance! Essay prompt: What motivates people to change? Essay: Many people know that eating junk food is unhealthy. Yet, they keep eating it because it ...
Monday, July 28, 2014 at 9:20pm

chemistry
The half live of Iodine-131 is 8 days. if you started out with 40 mg sample of iodine-131, then what would be the mass of the sample after 32 days? please show your work
Monday, July 28, 2014 at 6:30pm

Chemistry
Orange juice clams that 200ml of their product contains 2.5 times the average daily allowance of Vitamin C. Calculate the average daily allowance of vitamin c (in mg) if the orange juice contains 0.040% (w/v) of vitamin C.
Monday, July 28, 2014 at 6:05pm

Chemistry
Calculate the maximun=m mass of ethanol that can be made from 5.6 tonnes of ethen
Monday, July 28, 2014 at 4:21pm

CHEMISTRY (IODINE VALUE-continuation)
y question is about Determination of Iodine Value in Fats & Oils experiment. I can't seem to get the right IV for coconut oil (Iv = 7-11 range). I followed the procedure used by American Oil Chemists Society, but still I'm getting an IV value of around 1. The volume of...
Monday, July 28, 2014 at 2:51pm

organic chemistry
What is the complete reaction mechanism for the reaction between butanone and methylamine (CH3NH2) with the reaction buffered at a pH of 3.5 and heated.
Monday, July 28, 2014 at 2:21pm

chemistry
Potassium 2:5 Chloride solution 30ml. How many milliliters of a potassium chloride 3:5 solution do you need to prepare the order?
Monday, July 28, 2014 at 12:51pm

Chemistry
100g of a saturated solution of KNO3 was cooled from 80 degrees to 50 degrees. What mass of KNO3 would be expected to crystallise out of the solution?
Monday, July 28, 2014 at 7:11am

CHEMISTRY
how to predict that given complex is sp3 dsp2 hybridized because in Mcqs they ask to identify hybridization in given compound
Monday, July 28, 2014 at 4:36am

Chemistry
How many liters of nitrogen oxide at STP are produced from the reaction of 59.g of NH3? Balanced Equation: Ammonia reacts with oxygen to produce nitrogen oxide and water. 4NH3(g)+5O2(g)→4NO(g)+6H2O(g)
Monday, July 28, 2014 at 1:07am

chemistry
A 52.3 kg sample of ethanol is needed for a reaction. What volume in liters of ethanol should be used? The density of ethanol is 0.789 g/mL
Sunday, July 27, 2014 at 8:27pm

Chemistry
Consider the data below Temperature(0C) Diffusivity(m2/s) 736 2 x 10-13 782 5 x 10-13 835 1.3 x 10-12 Given this data, determine the activation energy for the diffusion process (units of Joules per atom or molecule) in this material and the pre-exponential factor (use units of...
Sunday, July 27, 2014 at 6:19pm

chemistry
1-Dinitrogen tetroxide (N2O4) dissociates according to the equation: N2O4 ⇌ 2NO2 An equilibrium reaction mixture at 25 ºC was found to have the partial pressure of N2O4 as 72 kPa whilst the partial pressure of nitrogen dioxide (NO2) was 29 kPa. Calculate Kp for the ...
Sunday, July 27, 2014 at 5:38pm

Chemistry
When normal atmospheric conditions are present, water is constantly being cycled between liquid and gaseous states by which of the following pairs of processes? A. Turgor pressure and filtration B. Melting point and condensation C. Evaporation and condensation D. Filtration ...
Sunday, July 27, 2014 at 4:56pm

Chemistry
Why would you subtract the heat of a calorimeter when calculating heat of the reaction? hint: the heat of the calorimeter is the amount of heat that the calorimeter absorbs from the solution-each calorimeter will absorb a certain amount of heat, which means that the ...
Sunday, July 27, 2014 at 4:51pm

chemistry check answer
Question: Explain whether using solid NaOH pellets rather than aqueous NaOH would alter the enthalpy. If different, would it be higher or lower My answer: Would the result be different since the aqueous NaOH would be able to quickly dissolve in water unlike solid NaOH which ...
Sunday, July 27, 2014 at 4:51pm

Chemistry
Consider the data below Temperature (0C) Diffusivity (m2/s) 736 2 x 10-13 782 5 x 10-13 835 1.3 x 10-12 Given this data, determine the activation energy for the diffusion process (units of Joules per atom or molecule) in this material and the pre-exponential factor (use units ...
Sunday, July 27, 2014 at 4:15pm

chemistry
Sodium metal is immersed into graduated cylinder that holds exactly 32.5 ml. The sodium metal used to fill the cylinder weighs 405.5 grams. Calculate the density of sodium based on the given data.
Sunday, July 27, 2014 at 10:35am

chemistry
A sol n contains 37g cuso4 and 111g water . Calculate the concentration by mass /c of sol n.
Sunday, July 27, 2014 at 8:46am

chemistry
Ammonium nitrate is used in explosives and is produced from the reaction of ammonia and nitric acid. If 15 kg of ammonia give an actual yield of 65.3 kg of ammonium nitrate, what is the percent yield? The calculated yield of ammonium nitrate for the experiment is 70.6kg.
Sunday, July 27, 2014 at 4:50am

chemistry
a.Given the equation: 2CaCO3 + 2SO2 + O2 -> 2CaSO4 + 2CO2 What is the actual yield of CO2 if 7.5 mol of O2 gives a percent yield of 80%? b. The pollutant sulfur dioxide can be removed from the emissions of an industrial plant by the reaction with calcium carbonate and ...
Sunday, July 27, 2014 at 4:47am

chemistry
A student used 3.27g of Zn to react with excess HCl and obtains 6.47g ZnCl2. What is the percent yield?
Sunday, July 27, 2014 at 4:37am

Chemistry
A 0.60 g sample consisting of only CaC2O4 & MgC2O4 is heated at 5000C, converting the two salts of CaCO3 and MgCO3 . The sample then weighs 0.465 g. If the sample had been heated to 9000C, where the products are CaO & MgO, what would the mixtures of oxides have weighed? a) 0....
Saturday, July 26, 2014 at 11:42pm

CHEMISTRY
how to predict that given complex is sp3 dsp2 hybridized because in Mcqs they ask to identify hybridization in given compound
Saturday, July 26, 2014 at 9:08pm

CHEMISTRY
how to predict that given complex is sp3 dsp2 hybridized
Saturday, July 26, 2014 at 7:37pm

chemistry
A silicon ribbon measuring 100 micron thick, 5 mm wide, and 1 m long has 5 volts applied across its long dimension. The resistivity of silicon is 640 ohm-m. How much current will flow through the ribbon? Express your answer in Amps
Saturday, July 26, 2014 at 7:07pm

chemistry
ph of 6.10mL of 1.20M HCl diluted to 0.560L .
Saturday, July 26, 2014 at 4:35pm

Chemistry
1 mole of equimolar mixture of ferric oxalate and ferrous oxalate will require xmole of KMnO4 in acidic medium for complete oxidation, x isis: a) 0.5 mole b) 0.9 mole c) 1.2 mole d) 4.5 mole
Saturday, July 26, 2014 at 2:49pm

Chemistry
A metal M forms the sulphate M2(SO4)3 . A 0.596 gram sample of the sulphate reacts with excess BaCl2 to give 1.220 g BaSO4. What is the atomic weight of M? (Atomic weights : S = 32, Ba = 137.3)
Saturday, July 26, 2014 at 2:48pm

Chemistry
Nitric acid can be produced from NH3 in three steps process: I)4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g) II)2NO(g) + O2(g) → 2NO2(g) III)3NO2(g) + H2O(l) →2HNO3(aq) + NO(g) % yield of Ist, IInd & IIIrd are respectively 50 % , 60 % & 80 % respectively the what ...
Saturday, July 26, 2014 at 2:44pm

chemistry
1. What is the binding energy per nucleon? Why is the binding energy per nucleon, rather than per nuclide, used to compare nuclide stability? 2. When a nucleus forms from nucleons, is energy absorbed or released? Why? 3. Many scientists reacted skeptically to Einstein's ...
Saturday, July 26, 2014 at 2:30pm

College English
John Winthrop “A Model of Christian Charity" Discuss the manner in which the theories expressed by Winthrop are in some degree evident in American government and culture today. CAN SOMEONE TELL ME IF I ANSWER IT RIGHT? In Prospero's America, Walter W. Woodward ...
Saturday, July 26, 2014 at 12:45pm

Chemistry Help
1. Spectroscopic studies of the reaction of azide ion with the cluster [Ru3(CO)12] in acetone solvent confirmed the occurrence of process (i) under a CO atmosphere. Kinetic measurements of this rapid [Ru3(CO)12]+ N3– →[Ru3(NCO)(CO)11]–+ N2(i) reaction revealed ...
Saturday, July 26, 2014 at 12:36pm

Chemistry
Suppose 26.0g of sodium bromide is dissolved in 150mL of a 0.60M aqueous solution of silver nitrate. Calculate the final molarity of bromide anion in the solution. You can assume the volume of the solution doesn't change when the sodium bromide is dissolved in it.
Saturday, July 26, 2014 at 7:10am

Chemistry
Calculate the number of millilitres of NH3(aq) solution (d = 0.986 g/ mL) contain 2.5 % by weight NH3 which will be required to precipitate iron as Fe(OH)3 in a 0.8 g sample that contains 50 % Fe2O3.
Saturday, July 26, 2014 at 7:05am

chemistry
*This is part of an exam. so please don't give full solution* just trying to bump ahead of a block. The decomposition of NO2 at room temperature exhibits the following variation in concentration with time: The concentration of NO2 is expressed in mol/liter, while time is ...
Saturday, July 26, 2014 at 12:00am

college English
Discuss the manner in which the theories expressed by John Winthrop are in some degree evident in American government and culture today. Can someone tell if my answer is right. In Prospero's America, Walter W. Woodward looks at the exchange of catalytic society to America ...
Friday, July 25, 2014 at 8:42pm

English
Discuss the manner in which the theories expressed by John Winthrop are in some degree evident in American government and culture today. Can someone tell if my answer is right. In Prospero's America, Walter W. Woodward looks at the exchange of catalytic society to America ...
Friday, July 25, 2014 at 7:31pm

Chemistry
Hydrogen Storage in Alloys - The Future? Certain alloys such as LaNi5 can store hydrogen at room temperature. A plate of LaNi5 containing no hydrogen is placed in a chamber filled with pure hydrogen and maintained at a constant pressure. At what depth from the surface will the...
Friday, July 25, 2014 at 6:10pm

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