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October 25, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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Chemistry
I'm really confused about how to do these two problems. Please help me. What is the amount of heat (kJ) required if 64.0 kg of H2O is heated from 25°C to 85°C? 200.0 g Al (C = 0.900 J/g × °C) at 95°C is added to 85.4 g H2O at 25°C. What is the ...
Thursday, September 25, 2014 at 3:46pm

Chemistry
PLEASE help because I'm really confused on how to do the entire thing. I don't know how to find the mL. Am I suppose to do anything with the 250mL? A person stops in every day and orders 250 mL of house coffee at precisely 95°C. but enough milk at 10°C to drop ...
Thursday, September 25, 2014 at 2:34pm

Chemistry
The name given to the geometric arrangement of the reacting species at the time of reactions is called --------------------?
Thursday, September 25, 2014 at 12:50pm

Chemistry
Given: CH4 + 2O2 ~ CO2 + 2H2O C - H = 99 kcal O - O = 119 kcal C = O = 192 kcal O - H = 111 kcal Calculate the change in energy for the CH4 - O2 system.
Thursday, September 25, 2014 at 12:48pm

chemistry
caculate the number of moles of magnesium ions in 5.5g magnesium phosphate
Thursday, September 25, 2014 at 12:39pm

chemistry
The radius of a niobium atom is 131 pm. How many niobium atoms would have to be laid side by side to span a distance of 4.53 mm? atoms
Thursday, September 25, 2014 at 12:35pm

chemistry
If someone has the time to help with the following question it would be really helpful. The problem is 209/83bi+64/28NI=272/111Rg+1/0n How to calculate the energy change in J/mol reactants? AMU amounts: Bi=208.980384 Ni= 63.927969 Rg=272.1535 What I have done is 1. subtract ...
Thursday, September 25, 2014 at 12:25pm

chemistry
what mass of silver chloride can be prepared by the reaction of 100 ml 0,20 M of silver nitrate with 100,0 ml of 0.15 M calcium chloride calculate the concentration of each ion reamaining in solution after the precipitation is complete
Wednesday, September 24, 2014 at 11:44pm

ap chemistry
what mass of barium sulfate can be produced when 100 ml 0.100 M of solution of barium chloride is mixed with 100.0 ml of a 0.100 M solution of Iron (III) sulfate
Wednesday, September 24, 2014 at 11:26pm

ap chemistry
what volume 0,100M of Na2PO4 is required to precipatate all the lead(II) ions from 150 ml of 0.250M Pb(NO3)2
Wednesday, September 24, 2014 at 11:11pm

Chemistry
A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 400mL of a solution that has a concentration of Na+ ions of 1.10M ?
Wednesday, September 24, 2014 at 10:29pm

Chemistry
If a sample of silver carbonate contains 1.75 grams of silver [Ag] atoms, calculate the mass (in grams) it contains of oxygen atoms [O].
Wednesday, September 24, 2014 at 10:06pm

Chemistry
Four isotopes of Lead occur naturally: 204Pb (mass = 203.973037 amu) 206Pb (mass = 205.974455 amu) 207Pb (mass = 206.975885 amu) 208Pb (mass = 207.976641 amu) If the percent abundance of 204Pb and 208Pb are 1.400 and 52.40, respectively, what is the percent abundance of 206Pb...
Wednesday, September 24, 2014 at 10:05pm

Chemistry
Find the mass (in g) of Carbon in 2.980 g Carbon dioxide.
Wednesday, September 24, 2014 at 9:58pm

chemistry
How many grams of chlorine gas are needed to make 5.10 × 106 g of a solution that is 1.50 ppm chlorine by mass?
Wednesday, September 24, 2014 at 9:43pm

Chemistry
A 45kg sample of water absorbs 349kJ of heat. If the water was initially at 25.5 degrees Celsius, what is its final temperature?
Wednesday, September 24, 2014 at 8:59pm

Chemistry
In lab, we were finding the distribution coefficient for propanoic acid and ethyl acetate. As well as propanoic acid and toluene. How would you write the chemical equation for the reaction of propanoic acid and ethyl acetate? I know it produces water in the end...but I am not ...
Wednesday, September 24, 2014 at 8:28pm

Chemistry
Three isotopes of Argon occur naturally: 36Ar (mass = 35.9675 amu) 38Ar (mass = 37.9627 amu) 40Ar (mass = 39.9624 amu) If the percent abundance of 36Ar is 0.3400, what is the percent abundance of 40Ar?
Wednesday, September 24, 2014 at 8:17pm

chemistry
6 small glass beads are found to weigh 9.34 g. The beads are placed in a graduated cylinder filled with ethyl alcohol (density 0.78 g/mL). The reading of the liquid in the cylinder before the beads were added is 21.5 mL. After the beads sink to the bottom of the alcohol the ...
Wednesday, September 24, 2014 at 7:50pm

Chemistry
Assume that the width of your body (across your shoulders) is 50.8 cm inches and the depth of your body (chest to back) is 25.0 cm. If the atmospheric pressure is 14.9lb/in^2, what mass of air (lb) does your body support when you are in an upright position?
Wednesday, September 24, 2014 at 6:36pm

chemistry
A mothball, composed of naphthalene (C10H8), has a mass of 1.10g
Wednesday, September 24, 2014 at 6:09pm

chemistry
A helium balloon contains 0.30g of helium. Given the molecular weight of helium is 4.0 g/mol, how many moles of helium does it contain?
Wednesday, September 24, 2014 at 5:54pm

chemistry help
For the reaction shown, find the limiting reactant for each of the following initial amounts of reactants? 2Na(s)+Br2(g) ---->2NaBr(s) 1. 2mol Na, 2mol Br2 2. 1.8mol Na, 1.4mol Br2 3. 2.5mol Na, 1mol Br2 4. 12.6mol Na, 6.9 mol Br2
Wednesday, September 24, 2014 at 5:32pm

chemistry
if 5.105 gm of KHP (Mwt=204.2)was dissolved in 250 ml,10.70 ml of this solution of KHP was titrated with 10.0 ml of NaOH . Calculate the concentration of NaOH solution
Wednesday, September 24, 2014 at 4:45pm

chemistry
An alka-seltzer tablet weighing 3 grams is added to a flask of water (weighing 250 grams).At the end of the experiment, the flask weighs a total of 249.6 grams.Explain why this experiment does not seem to follow the Law of Conservation of Mass and how the experiment could be ...
Wednesday, September 24, 2014 at 4:21pm

Organic Chemistry
The solubility of compound A in ethanol is 0.5 g per 100 mL at 0oC and 5.0 g per 100 mL at 78oC. (a) To make a hot, saturated solution of 15.0 g of A at 78oC, how much ethanol is required? (b) When the solution prepared in is cooled to 0oC, how much of compound A will be ...
Wednesday, September 24, 2014 at 12:21pm

CHEMISTRY
How to determine direction of polarity? For instance im studying from a practice quiz, an it says that in CH3OH the oxygen is slightly negative, which is understandable as its next to F. but then it says the H is slightly positive. why the H and not the carbon which is two ...
Wednesday, September 24, 2014 at 11:53am

Chemistry
The solubility of acetanilide in your recrystallizing solvent is 5.0 mg per mL at 10 degrees Celsius. Calculate the maximum percent recovery in this experiment, assuming a 15.0 mL recrystallizing solution is filtered at 10 degrees Celsius.
Wednesday, September 24, 2014 at 5:38am

CHEMISTRY
How can we prepare or change : 1) change unsaturated to saturated soln? 2) change unsaturated to supersaturated? 3) change saturated to unsaturated ? 4) change saturated to supersaturated ? 5) change supersaturated to unsaturated? 6) change supersaturated to saturated ?
Wednesday, September 24, 2014 at 3:13am

CHEMISTRY
Which solute will yield a saturated solution ( in the previous two question ) when we dissolve 36 g of each in 25 g of water at 25 oC ? and why ?
Wednesday, September 24, 2014 at 2:52am

CHEMISTRY
The solubility of NaNO3 at 40 oC is 102 g/100 g H2O , what is the minimum amount of water to dissolve NaNO3 ( mass of solvent ) ?
Wednesday, September 24, 2014 at 2:46am

CHEMISTRY
The solubility of LiCl is 83.5 g/100 g H2O at 20 oC , and is 89.8 g / 100 g H2O at 40 oC , then what is the required mass (in gram ) of LiCl to obtain a saturated solution in 300 g H2O at 25 oC ? please explain thank a lot
Wednesday, September 24, 2014 at 2:41am

chemistry
The reaction of 9.58 g of Carbon with excess O2 yields 8.90 g of CO2, what is the percent yield of this reaction?
Wednesday, September 24, 2014 at 1:39am

Chemistry molar heat of fusion
A styrofoam cup with a mass of 2.97g has 81.68g of hot water at60.0 •C has ice added to it untill it reaches a temrature of 7.0•C and weights 141.12g. What is the molar heat lost by the water to melt the ice. Equation: -(mcdeltaT)=(deltaHn)+(mcdeltaT) m1=81.68g. ...
Wednesday, September 24, 2014 at 1:08am

ap chemistry
what volume of0.100 M NaPO4 is required to precipitate all the lead(II) ions from 150ml of 0.254 M Pb(NO3)2
Wednesday, September 24, 2014 at 12:15am

chemistry
Oops I left a part of the question out: 2. Mercury poisoning is a debilitating disease that is often fatal. In the human body, mercury reacts with essential enzymes, leading to irreversible inactivity of these enzymes. If the amount of mercury in a polluted lake is 215 ng of ...
Tuesday, September 23, 2014 at 10:26pm

organic chemistry
an alkane formula c8h18 can form only three monochlorination products give its structure
Tuesday, September 23, 2014 at 10:20pm

chemistry
Mercury poisoning is a debilitating disease that is often fatal. In the human body, mercury reacts with essential enzymes, leading to irreversible inactivity of these enzymes. If the amount of mercury in a polluted lake is 215 ng of mercury / mL, what is the total mass in ...
Tuesday, September 23, 2014 at 10:06pm

chemistry
Would a substance with a density of 7.89 kg/dm^3 float on a substance that has a density of 14.2 g/ml?
Tuesday, September 23, 2014 at 9:56pm

Chemistry 15
a vessel connected to an open-end mercury manometer is filled with gas to a pressure of .835 atm.the atmospheric pressure is 755 torr.In which arm of the manometer will the level of mercury be higher?What is the height difference between the two arms of manometer?
Tuesday, September 23, 2014 at 9:51pm

Chemistry
A professor orders 250 mL of house coffee at precisely 95°C. She then adds enough milk at 10°C to drop the temperature of the coffee to exactly 90° C. Calculate the amount of milk (in mL) the professor must add to reach this temperature. Assume that the coffee and ...
Tuesday, September 23, 2014 at 9:26pm

Chemistry, HELP!!
a) If the volume of a flask is 165 mL and the mass of the vapor in the flask is 0.2136 grams, what is the density of vapor in the flask? b)If the temperature of the vapor is 25 degrees Celsius, what is the molecular weight of the vapor? (Assume the gas pressure to be 1.00 atm.)
Tuesday, September 23, 2014 at 9:23pm

Chemistry, empirical formula
Determine the empirical formula for the following compounds with these compositions (by mass): a) Cr 47.7% F 52.3% b) Na 42.1% P 18.9% O 39.0%
Tuesday, September 23, 2014 at 9:19pm

chemistry
A 50g chunk of metal (c=0.0506 j/g°C) is heated to 60°C. it is then dropped into a calorimeter(c=1.40 j/g°C,m=5.0 g)that contains 100.0g of an unknown liquid. the temperature of the liquid raises from 15°C to 20°C.What is the c of the calorimeter?
Tuesday, September 23, 2014 at 8:53pm

chemistry
A sample of 1.15g of lead (II) nitrate is mixed with 121mL of 0.104 M sodium sulfate solution. Part A Write the chemical equation for the reaction that occurs.
Tuesday, September 23, 2014 at 5:57pm

Chemistry
A hydrogen atom has a mass of 1.673x10^-24 g How many hydrogen atoms would you have in 5.6 g of hydrogen?
Tuesday, September 23, 2014 at 5:29pm

chemistry
10. A student weight out a 25 g sample of NaCl, SiO2 and NH4Cl. The student determines the sample contains 3.0 g NH4Cl and 7.0 g SiO2. What is the percentage of NaCl by mass (weight) in the sample?
Tuesday, September 23, 2014 at 5:08pm

Chemistry
Since a hydrogen atom consists of just one proton and one electron, it should have a mass of 1.673 x 10^-24 g. And so it does. Calculate how many hydrogen atoms you'd have if you had 5.6 g of hydrogen.
Tuesday, September 23, 2014 at 5:04pm

Chemistry
How much energy must you use to raise the temperature of 100 grams of water from 60 degrees Celsius to 70 degrees Celsius? show you calculations. I am confused on how to use formulas.
Tuesday, September 23, 2014 at 12:18pm

Analytical Chemistry (Titrations)
About 10ml of concentrated HCl was transferred to a 1-L volumetric flash and diluted to mark with distilled water. When this solution was used to titrate a sample of pure sodium carbonate, Na2Co3, weighing 0.3054 gram, it took 35.09 ml to reach the methyl red end point. The ...
Tuesday, September 23, 2014 at 12:15pm

chemistry
Can someone tell me what steps i need to take? So confused on how to solve this An average human adult takes about 15breaths per min and exhales 23ml of co2 with each breath. If your trapped in a cave with pressure .963atm and 11C and your only source of oxygen is a breathing ...
Tuesday, September 23, 2014 at 11:40am

Chemistry
How many grams of sodium carbonate are in a sodium carbonate sample that contains 1.773x10^17 carbon atoms? How do I work this out?
Monday, September 22, 2014 at 11:25pm

Chemistry
How many protons are contained in a circular puddle of mercury that is 8.5 inches wide and .25 inches deep?
Monday, September 22, 2014 at 11:24pm

Chemistry
How many carbon atoms are contained within 10.0 pounds of sugar, (sucrose) which has the formula c12h22o11?
Monday, September 22, 2014 at 11:02pm

Chemistry
Suppose a metal worker shapes a 3.4 mg piece of gold until it is a thin, perfectly square plate that is uniformly 8.6x10^-6 cm thick. What is the length of a side of the plate, in cm?
Monday, September 22, 2014 at 11:00pm

chemistry
How many grams of copper atoms are needed to supply the same number of atoms as does 235 grams of iron?
Monday, September 22, 2014 at 10:43pm

Chemistry
I am having great difficulty with the following questions. Any and all help will be greatly appreciated. I have read the chapter and even looked up online tutorials. I still do not understand it. 2 NO (G) + O2 (G) > 2 NO2 (G) Write the equilibrium constant expression for ...
Monday, September 22, 2014 at 10:33pm

chemistry
A 2.556g sample of baking soda (NaHCO3)decomposes to produce 0.876g of solid sodium carbonate. Caculate the theoretical yield and the percent yield of the sodium carbonate. The equation is: 2NaHCO3(s) -> Na2CO3(s) + H2O + CO2(g)
Monday, September 22, 2014 at 10:18pm

Chemistry
A graduated cylinder contains 56.3ml of water. A metal cylinder is dropped in the water and is completely covered by water. The diameter of the cylinder is 3.8 cm and the height of the cylinder in 5.4cm. What is the volume reading in the graduated cylinder after the cylinder ...
Monday, September 22, 2014 at 7:40pm

High School Chemistry
Determine the number of valence electron and the oxidation numbers for each of the following atoms. 1. Pb atomic #82 #valence e-'s= oxidation# =
Monday, September 22, 2014 at 5:44pm

Chemistry
4) Using your initial mass of copper (0.38), calculate the minimum volume of concentrated 12M nitric acid needed to completely react with your copper to form copper (II) nitrate 5) Using your answer from question 4 (2x10^-3 L), calculate the minimum volume of 6M sodium ...
Monday, September 22, 2014 at 5:26pm

chemistry-repost
Sorry to post this again, not sure if it was seen. If someone has the time to help with the following question it would be really helpful. Posted by Nancy on Monday, September 22, 2014 at 9:55am. The problem is 209/83bi+64/28NI=272/111Rg+1/0n How to calculate the energy change...
Monday, September 22, 2014 at 4:46pm

chemistry
Hydro chloric acid is usually purchased on the concentration of 36.5% . Why it is not obtained in 100% concentration?
Monday, September 22, 2014 at 11:29am

chemistry
In a butane lighter, 9.2g g of butane combines with 32.9g g of oxygen to form 27.8g g carbon dioxide and how many grams of water?
Monday, September 22, 2014 at 10:42am

chemistry
The problem si 209/83bi+64/28NI=272/111Rg+1/0n How to calculate the energy change in J/mol reactants? AMU amounts: Bi=208.980384 Ni= 63.927969 Rg=272.1535 What I have done is 1. subtract products from reactants. 2. multiply the result by 1.66054x10^-27kg 3. multiply that by 8....
Monday, September 22, 2014 at 9:55am

Chemistry
8.5 Ed's = 10 Ebb's, 12 Ersk's = 100 Ed's and 5 Ebb's = 1 Zum. How many Zum's in approx. 1 Ersk? Starts out: 1 Ersk*__________ Ersk
Monday, September 22, 2014 at 1:50am

Chemistry
How much energy(in calories)would it take to heat 13g of water 2 degrees Celsius?? 1.00cal/1g C = 13 x 2 = 26 Calories Is that right?
Monday, September 22, 2014 at 1:43am

CHEMISTRY
1 mole of nitroglycerin decomposes and release 5.72*10^3 KJ heat. to give CO2 H2O O2 and N2. A) write the balanced chemical equation B) calculate the work done assuming the temp of the reaction is 450K
Monday, September 22, 2014 at 12:42am

Chemistry
A 530 mL solution 10% HCl has been spilt onto the bench. It cannot be diluted or washed away. How much of the granular NaOH from the container seen in a previous photograph, must be used to neutralise the acid? [Using NaOH: MM = 40 g/mol]
Monday, September 22, 2014 at 12:38am

CHEMISTRY
Why dissolving gases in the liquids is exothermic while the phase is down ? explain please
Monday, September 22, 2014 at 12:30am

chemistry
After isolating the sulfonated product, the filtrate volume is found to be 25.25 mL. A dilution using 1 mL of filtrate and 99 mL of water gives a solution with an absorbance of 0.427. How many moles of indigo carmine were produced? (Molar absorptivity of indigo carmine was ...
Monday, September 22, 2014 at 12:22am

Chemistry
The men's marathon world record was in a time of 2hours, 4minutes, and 55 seconds. The standard distance is 26 miles 385 yard. At this pace, what is his speed in miles per hour?
Sunday, September 21, 2014 at 9:47pm

Chemistry
A certain brine has 3.96% NaCl by mass. A 75.0−mL sample weighs 76.7g How many liters of this solution should be evaporated to dryness to obtain 730kg NaCl?
Sunday, September 21, 2014 at 9:42pm

chemistry
Does adding the wrong amount of water to a compound when recrystallizing affect percent recovery?
Sunday, September 21, 2014 at 6:49pm

Chemistry
The dimensions of aluminum foil in a box for sale at a supermarket are 66.6 yards by 12 inches. The mass of the foil is .83kg. What is the thickness of the foil (in cm)? (1in = 2.54 cm)
Sunday, September 21, 2014 at 5:49pm

Chemistry
What osmotic pressure in atmospheres would you expect for a solution of 0.150M CaCl2 that is separated from pure water by a semipermeable membrane at 310 K? Assume 100% dissociation for CaCl2 Any help is appreciated, thank you!
Sunday, September 21, 2014 at 5:02pm

Chemistry
What partial pressure of oxygen above the water (in atmospheres at 0 C ) is needed to obtain this concentration? The solubility of O2 in water at 0 C and 1 atm partial pressure is . 2.21 x 10^-3 mol/L Concentration needed is 4mg/L Stuck and need help, anything is appreciated!
Sunday, September 21, 2014 at 4:56pm

chemistry
Calculate the volume in liters of a M copper(II) sulfate solution that contains of copper(II) sulfate . Round your answer to significant digits.
Sunday, September 21, 2014 at 3:13pm

Chemistry
Given: Cu2O(s) + 1/2 O2(g) → 2CuO(s) deltaH°= -144 kJ 2Cu2O(s) → 2Cu(s) + 2CuO(s) deltaH°= 22 kJ Calculate the standard enthalpy of formation of CuO(s).
Sunday, September 21, 2014 at 3:09pm

Chemistry Lab MgO
If in Part B.2, the burning of the magnesium is uncontrolled (burns brightly), how will this procedural error affect the reported mass of: a Magnesium in the magnesium oxide? Explain. B. oxygen in the magnesium oxide? Explain.
Sunday, September 21, 2014 at 3:07pm

Chemistry
Hydrogen cyanide is produced in the following balanced reaction. 2NH3 (g) + 3O2 (g) + 2CH4 (g) → 2HCN (g) + 6H2O (g) Given the following standard heats of formation, calculate the approximate ΔH°rxn of this reaction. Substance ΔHf°(kJ/mol) NH3 -46 CH4 -...
Sunday, September 21, 2014 at 2:38pm

Chemistry
The student wanted to be sure he had made Calcium Oxide. He crushed some heated limestone and added water. The mixture got hot. The student cooled the mixture and filtered it. This gave a colourless solution and a white solid that was left in the filter paper. The student ...
Sunday, September 21, 2014 at 2:32pm

chemistry of solutions
NaI(aq)+Hg2(C2H3O2)2(aq)→
Sunday, September 21, 2014 at 1:58pm

chemistry
At 25∘C the reaction from Part A has a composition as shown in the table below. Substance Pressure (atm) C2H2(g) 4.65 H2(g) 3.85 C2H6(g) 5.25×10−2 What is the free energy change, ΔG, in kilojoules for the reaction under these conditions?
Sunday, September 21, 2014 at 12:53pm

chemistry
What is the density of a piece of zinc that has a volume of 8000 cubic cm? density= mass/ volume
Sunday, September 21, 2014 at 12:49pm

Chemistry Need help ASAP
A proposed mechanism for a reaction is: (i) A + B2 = AB2 Ea1 = 12 kJ/mol ƒ´H1 = 3 kJ/mol (ii) AB2 + C2 = ABC + BC Ea2 = 30 kJ/mol ƒ´H2 = 5.2 kJ/mol (iii) ABC + B2 = AB2 + BC Ea3 = 10 kJ/mol ƒ´H3 = -7.8 kJ/mol a) Which is the rate determining ...
Sunday, September 21, 2014 at 12:38pm

chemistry
write half reaction for KMnO4 and (COMM)2 and balance the equation.calculate the atomic mass of M in14.0g/dm3 of solution
Sunday, September 21, 2014 at 12:04pm

chemistry
how many grams of HCL are consumed in the reaction of 378 grams of a mixture containing 18.2 % MgCO3 and 81.1% MgOH2 by mass
Sunday, September 21, 2014 at 11:00am

Chemistry (Ionic Equilibria)
When a WEAK acid can be said to be weak, and when a WEAK acid can be said to be strong? I only know the difference between weak acids and strong acids, but i dont know that even weak acids can be classified as weak and strong. Plz help
Sunday, September 21, 2014 at 3:35am

Chemistry Need help ASAP
A proposed mechanism for a reaction is: (i) A + B2 = AB2 Ea1 = 12 kJ/mol ƒ´H1 = 3 kJ/mol (ii) AB2 + C2 = ABC + BC Ea2 = 30 kJ/mol ƒ´H2 = 5.2 kJ/mol (iii) ABC + B2 = AB2 + BC Ea3 = 10 kJ/mol ƒ´H3 = -7.8 kJ/mol a) Which is the rate determining ...
Sunday, September 21, 2014 at 1:33am

Chemistry
Which process could be used to calculate the bond energy for the covalent bond X-Y by dividing its ∆H by n? A XYn(g) → X(g) + nY(g) B 2XYn (g) → 2XYn-1(g) + Y2(g) C Y(g) + XYn-1(g) → XYn(g) D nXY(g) → nX(g) + n/2 Y2(g)
Sunday, September 21, 2014 at 12:14am

chemistry
Calculate the number of moles of O atoms in a 2.5x10(-6)kg sample of C8H10N4O2
Saturday, September 20, 2014 at 11:17pm

chemistry
Calculate the number of C atoms in a .25mg sample of C8H10N4O2
Saturday, September 20, 2014 at 11:16pm

chemistry
A proposed mechanism for a reaction is: (i) A + B2 = AB2 Ea1 = 12 kJ/mol ƒ´H1 = 3 kJ/mol (ii) AB2 + C2 = ABC + BC Ea2 = 30 kJ/mol ƒ´H2 = 5.2 kJ/mol (iii) ABC + B2 = AB2 + BC Ea3 = 10 kJ/mol ƒ´H3 = -7.8 kJ/mol a) Which is the rate determining ...
Saturday, September 20, 2014 at 10:57pm

Chemistry
A proposed mechanism for a reaction is: (i) A + B2 = AB2 Ea1 = 12 kJ/mol ƒ´H1 = 3 kJ/mol (ii) AB2 + C2 = ABC + BC Ea2 = 30 kJ/mol ƒ´H2 = 5.2 kJ/mol (iii) ABC + B2 = AB2 + BC Ea3 = 10 kJ/mol ƒ´H3 = -7.8 kJ/mol a) Which is the rate determining ...
Saturday, September 20, 2014 at 10:39pm

chemistry
A proposed mechanism for a reaction is: (i) A + B2 AB2 Ea1 = 12 kJ/mol ƒ´H1 = 3 kJ/mol (ii) AB2 + C2 ABC + BC Ea2 = 30 kJ/mol ƒ´H2 = 5.2 kJ/mol (iii) ABC + B2 AB2 + BC Ea3 = 10 kJ/mol ƒ´H3 = -7.8 kJ/mol a) Which is the rate determining step? ...
Saturday, September 20, 2014 at 10:36pm

chemistry
The number of kilojoules needed to raise the temperature of 125 g of water from 20°C to 95°C is ________. The specific heat of water is 4.184 J/g °C.
Saturday, September 20, 2014 at 9:22pm

chemistry
balanced equation =2 H(2)+ 1 O(2) -> 2H(2)O A. What mass of H2O would be produced from7.4 mg of O2 B. What is the volume of H2O would be produced from 7.4kg of O2. Density of water = 1.000g/ml
Saturday, September 20, 2014 at 7:02pm

chemistry
an x-ray photon of wavelength 0.989nm stricks a surface. the emitted electron has a kinetic energy of 969 eV.what is the binding energy of the electron in kj/mol?
Saturday, September 20, 2014 at 5:15pm

Chemistry
A solution contains naphthalene (C10H8) dissolved in hexane (C6H14) at a concentration of 15.00% naphthalene by mass. Calculate the vapor pressure at 25 ∘C of hexane above the solution. The vapor pressure of pure hexane at 25 ∘C is 151 torr. I keep getting 168 torr...
Saturday, September 20, 2014 at 3:49pm

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