Monday
April 27, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
1) How would you expect the solubility of the following to vary n a series of solutions of increasing ionic strength created by adding KNO3 a) ammonia b) ammonium chloride 2) If the ionic strength was increased by adding KCl, the solubility of which one of the above two ...
Wednesday, March 25, 2015 at 12:32am

chemistry
A particular weak acid (HA) with a Ka of 2.0e-5 is 75% titrated with a strong base to produce a buffer solution. What is the pH of this final solution? Show all work.
Tuesday, March 24, 2015 at 11:25pm

Chemistry
Refer to the table given for the ionic radii in your lab manual and approximate the attractive portion of the lattice energy for 1 mole of the following salts. (Consider only one bond if more than one bond exists.) a) PbS2 b) Ca3P2 c)Ca3N2
Tuesday, March 24, 2015 at 11:13pm

Chemistry
A voltaic cell operates with 0.40 M Zn 2+ at the solid zinc anode and 1.45 M Zn2+ at the solid zinc cathode at 25 C. Is the reaction thermodynamically favored?
Tuesday, March 24, 2015 at 11:12pm

chemistry
A spark plug fires before the gases in a cylinder are fully compressed. How will the engine be affected? A. The engine will get better gas mileage as less fuel is burned during each cycle. B. There will be fewer pollutants as the fuel has more time to burn. C. The gases will ...
Tuesday, March 24, 2015 at 10:30pm

chemistry
What volume of nitrogen gas at STP can form from 1.20 mol NaN3? 2NaN3(s) 2Na(s) + 3N2(g) A. 40.3 L B. 1.20 L C. 13.4 L D. 1.80 L
Tuesday, March 24, 2015 at 10:29pm

chemistry
Refer to the table given for the ionic radii in your lab manual and approximate the attractive portion of the lattice energy for 1 mole of the following salts. (Consider only one bond if more than one bond exists.) (a) SrO
Tuesday, March 24, 2015 at 10:09pm

Chemistry
What volume of carbon dioxide is produced when 7.5g of butane react with 19g of oxygen gas at 74 degrees celsius at 550 torr?
Tuesday, March 24, 2015 at 10:07pm

Chemistry
How many moles of gas will occupy 6.75 m3 at 65.0°C and 3.28 x 105 Pa? A. 7.98 x 104 mol B. 4.10 x 103 mol C. 7.88 x 102 mol D. 4.15 x 105 mol
Tuesday, March 24, 2015 at 9:48pm

Chemistry
Zn(OH)2 was saturated in a solution of sodium hydroxide. The following equilibra exist under these conditions Zn(OH)2 -> Zn2+ +2OH- Ksp Zn2+ +OH- -> Zn(OH)+ K1 Zn(OH)- + OH- -> Zn(OH)2 K2 Zn(OH)2 + OH- -> Zn(OH)3- K3 Zn(OH)3- +OH- -> Zn(OH)42- K4 a) Sum of which...
Tuesday, March 24, 2015 at 9:40pm

Chemistry
There is a picture of a brick lying face down and one standing straight up. The question asks: Is each brick exerting the same force? Explain. I know that they are exerting the same force, but I don't understand why and how to explain it?
Tuesday, March 24, 2015 at 8:32pm

Chemistry
Step 1: A 12.70mL sample of cyanide solution was mixed with 25.00mL of a solution of nickel ions at an appropriate pH to form the Ni-cyanide complex. The resulting solution was titrated cs 0.0130M EDTA and required 10.10mL to reach the end point. Step 2: Then 30.00mL of the ...
Tuesday, March 24, 2015 at 8:12pm

Analytical Chemistry
For a triprotic acid H2PO4. Ka1=7.11e-3, Ka2=6.32e-8 and Ka3=7.1e-13. 50mL each of 0.05F CaCl2 and 0.05F phosphoric acid were mixed. Ksp CaHPO4=2.6e-7. a) Would CaHPO4 precipitate when phosphoric acid and calcium chloride were mixed together? b) List all species (ions, ...
Tuesday, March 24, 2015 at 7:52pm

Cultural Anthropology
DESCRIBE 2 REASONS WITH EXAMPLES WHY IT IS IMPORTANT TO HAVE A STRICT CODE OF ETHICS IN ANTHROPOLOGY AND OTHER SOCIAL SCIENCES COMPARED TO MORE SCIENTIFIC DISCLIPLINES SUCH AS CHEMISTRY OR PHYSICS My textbook is Cultural anthroplogy by barbra miller and i can't find ...
Tuesday, March 24, 2015 at 5:55pm

chemistry
One gram of pbcl2 is dissolved in 1.0 l of hot water. When the solution is cooled to 25degrees Celsius, will some of the pbcl2 crystallize out? If so, how much? I just don't know where to start/ where to go with this problem Any help is appreciated!!
Tuesday, March 24, 2015 at 5:41pm

Chemistry
The amino acid glycine, C2H5NO2, is one of the compounds used by the body to make proteins. The equation for its combustion is 4C2H4NO2(s)+9O2(g)---> 8CO2(g)+10H2O(l)+2N2(g) For each mole of glycine that burns, 973.49 kJ of heat is liberated. Use this information, plus ...
Tuesday, March 24, 2015 at 5:37pm

chemistry
A spark plug fires before the gases in a cylinder are fully compressed. How will the engine be affected? A. The engine will get better gas mileage as less fuel is burned during each cycle. B. There will be fewer pollutants as the fuel has more time to burn. C. The gases will ...
Tuesday, March 24, 2015 at 4:31pm

Chemistry
In the recovery of iron from iron ore, the reduction of the ore is actually accomplished by reactions involving carbon monoxide. Use the following thermochemical equations, Fe2O2(s) + 3CO(g) ---> 2Fe(s) +3CO2(g) ΔH° = -28kJ 3Fe2O2(s) + CO(g) ---> 2Fe3O4(s)+ CO2(...
Tuesday, March 24, 2015 at 4:30pm

chemistry
The molecules of which gas have the greatest velocity at 120°C? A. O2 B. CO2 C. NH3 D. Cl2
Tuesday, March 24, 2015 at 4:08pm

chemistry
Which of the following is not a physical property of gases? A. Low density B. No thermal expansion C. No fixed shape D. Compressibility I believe the answer is B
Tuesday, March 24, 2015 at 3:57pm

Chemistry
Sulfuric acid can dissolve aluminum metal according to the following reaction. 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H​2(g) Suppose you wanted to dissolve an aluminum block with a mass of 24.4g . What minimum amount of H2SO4 in grams would you need?
Tuesday, March 24, 2015 at 3:39pm

Chemistry
Methane burns with oxygen to produce carbon dioxide and water as a gas. The balanced thermochemical equation is Ch4(g) + 2)2(g) ---> CO2(g) + 2H2O(g) H = -802kJ How much methane, in grams, must be burned to release 544 kJ of heat? My answer: 544/802 = 0.678 0.678*16= 10....
Tuesday, March 24, 2015 at 3:10pm

chemistry
how much ml of concentrated hci required to make 0.5N hcl solution? /
Tuesday, March 24, 2015 at 12:43pm

college chemistry
solid diarsenic trioxide reacts with Flourine gas to produce liquid arsenic pentaflouride and oxygen gas. Write the Qc for this reaction
Tuesday, March 24, 2015 at 12:06pm

chemistry
the combustion of co2 gives -393.5kj/mol calculate the heat of formation of 35.2grams of co2
Tuesday, March 24, 2015 at 11:50am

Chemistry
How many mL of HCl solution are required to change pH from 2.67 to 9.25?
Tuesday, March 24, 2015 at 8:45am

Chemistry
Estimate the solubility of TISCN in a solution of which ionic strength is 1.265e-2M at 25 degree and Ksp=1.6e-4. I do not know why Prof. gives me ionic strength? In the next question, Prof. said " For a sparingly soluble ionic compound of type AB the solubility can be ...
Tuesday, March 24, 2015 at 1:46am

chemistry
How would you make 1L of a buffer of pH=11 starting with 15g of base, C5H11N:. At you disposal are 1M HCl and 1M NaOH, pH meter, balance, distilled water and glassware. Try to be quantitative in expressing amounts of material that you will use. Given for C5H11NH+ pKa=11.25. ...
Tuesday, March 24, 2015 at 1:43am

chemistry
What are the parameters of a sample of gas that are all interrelated and affect each other when any one of them changes? A. Pressure, volume, number of moles, and temperature B. Shape, hardness, transparency, and odor C. Mass, density, color, volume, and pressure D. ...
Tuesday, March 24, 2015 at 1:02am

chemistry
There are 5.00*10^-3 moles of lead II nitrate. Calculate how man grams this is.
Tuesday, March 24, 2015 at 12:47am

Chemistry
Which properties of a gas increase linearly as the temperature is increased? A. Volume and density B. Volume and pressure C. Amount of gas and density D. Amount of gas and volume I believe the answer is A or D But I am pretty sure the answer is a
Monday, March 23, 2015 at 11:19pm

Chemistry
A spark plug fires before the gases in a cylinder are fully compressed. How will the engine be affected? A. The engine will get better gas mileage as less fuel is burned during each cycle. B. There will be fewer pollutants as the fuel has more time to burn. C. The gases will ...
Monday, March 23, 2015 at 11:07pm

Chemistry
The standard heat of combustion of eicosane, C20H42 (s), a typical component of candle wax, is -1.332 x 104 kJ/mol (consider this number to be exact in your calculations), when it burns in pure oxygen, and the products are cooled to 25°C. The only products are CO2 (g) and ...
Monday, March 23, 2015 at 10:58pm

Chemistry
100 ml of 15 g/L silver nitrate reacts with an unknown concentration solution of copper (ll) chloride. the reaction for me only 2 grams of silver (l) chloride. If 75 mL of the copper (ll) chloride solution was mixed in, what is the initial concentration of the solution?
Monday, March 23, 2015 at 10:48pm

chemistry
During which stroke of a four-stroke internal combustion engine is work done to the system of gases? A. Exhaust stroke B. Intake stroke C. Compression stroke D. Power stroke
Monday, March 23, 2015 at 10:35pm

chemistry
You have to prepare a pH 5.00 buffer, and you have the following 0.10M solutions available: HCOOH, HCOONa, CH3COOH, CH3COONa, HCN, and NaCN. Which solutions would you use? HCOOH HCOONa CH3COOH CH3COONa HCN NaCN
Monday, March 23, 2015 at 10:24pm

Chemistry
Gases can be differentiated from solids and liquids because gases have: A. reduced chemical reactivity. B. no color. C. average densities on the order of 10-3 g/mL. D. a spherical shape. I think the answer is C or D.
Monday, March 23, 2015 at 10:20pm

Chemistry
Titration of Na2CO3 with HCl. (pKa1(H2CO3) = 6.352, pKa2(H2CO3) = 10.329) . Calculate the pH at each of the following volumes of 0.20 M HCl added to 20.00 mL of 0.10 M Na2CO3. I figured out everything except for adding 20.00 ml of 0.20M HCL. Please help asap.
Monday, March 23, 2015 at 10:16pm

chemistry
Which properties of a gas increase linearly as the temperature is increased? A. Volume and density B. Volume and pressure C. Amount of gas and density D. Amount of gas and volume I believe the answer is A or D But I am pretty sure the answer is a
Monday, March 23, 2015 at 9:58pm

Chemistry (Aspirin Synthesis- Unreacted SA
To determine the yield of your ASA synthesis, you can quantify the amount of unreacted SA Weigh out 0.15 g of your crude ASA into a clean tared 7 mL vial. Record exact mass. 2) Add 5 mL ethanol. 3) Cap vial and mix well. 4) Transfer the above solution into a 50 mL volumetric ...
Monday, March 23, 2015 at 9:40pm

Chemistry
Which of the following best applies to the pressure of a gas? A. It is the force per unit volume. B. It decreases with temperature. C. It increases with volume. D. It is the sum of the collisions of the molecules. Is it a or d.
Monday, March 23, 2015 at 9:39pm

chemistry help
If the standard calcium carbonate solution is 100 ppm and 25 mL of solution is used for the standardization, calculate the approximate volume of 2mM EDTA solution needed to reach the end point of the titration. I know to use M1V1=M2V2 but need help converting units of ...
Monday, March 23, 2015 at 8:43pm

chemistry
A solution is made by containing 15 mL of 17.5 M acetic acid with 5.52 g of sodium acetate and diluting to total volume of 1.50 L. Calculate the pH
Monday, March 23, 2015 at 6:13pm

Chemistry
A solution is made by containing 15 mL of 17.5 M acetic acid with 5.52 g of sodium acetate and diluting to total volume of 1.50 L. Calculate the pH
Monday, March 23, 2015 at 3:50pm

General Chemistry
What is the concentration in ppm of Ag in a 245 lb of Ore that contains 83.5g of silver?
Monday, March 23, 2015 at 3:31am

CHEMISTRY
Two gases A and B having the same volume diffuse through a porous in 20 and 10 seconds respectively .The molecular mass of A is 49u.Molecular mass of B will be
Monday, March 23, 2015 at 2:26am

chemistry
1)Thallium (I) is oxidized by cerium (IV) as follows: Tl+ + 2 Ce+4  Tl+3 + 2 Ce+3 The elementary steps, in the presence of Mn(II), are as follows: Step 1 Ce+4 + Mn+2 --- Ce+3 + Mn+ Step 2 Ce+4 + Mn+3 ---- Ce+3 + Mn+4 Step 3 Tl+ + Mn+4 ----- Tl+3 + Mn+2 (a) Identify the...
Sunday, March 22, 2015 at 11:39pm

chemistry
I'm having trouble balancing this equation in a basic solution. Cr(OH)3 + Br2 -----> CrO4{2-} + Br{-} Do I do start this with half reactions Thanks
Sunday, March 22, 2015 at 10:49pm

Chemistry, pre Algebra
Glycopyrrolste comes in quantity of 25 vials and has an AWP of $135.the store has an agreement with the contractor to purchase that chemical at the AWP minus 10% the insurer is willing to pay the AWP plus 3 % plus a $4 dispensing fee. a patient on this ensures plan purchases 5...
Sunday, March 22, 2015 at 10:15pm

Chemistry help
Why it is important for there to be no further bubbling before the final mass of the reaction beaker is obtained?
Sunday, March 22, 2015 at 10:06pm

Chemistry help
Why is it important for the reaction beaker to be completely dry before weighing?
Sunday, March 22, 2015 at 10:04pm

Chemistry
A sodium chloride solution has a density of 1.22 g/mL. How many moles of NaCl are dissolved in 10.0 mL of the solution? The density of water is 1.00 g/mL. My solution: ? mol NaCl = 10 mL*1.22 g/1mL*1mL/58.5g The correct answer is 3.76E-2 mol. Please help!
Sunday, March 22, 2015 at 9:10pm

Chemistry
Determine the number of molecules of the compound iron phosphate with 129.68 g Fe3(PO4)2
Sunday, March 22, 2015 at 8:36pm

chemistry
Consider the reaction 2 NO2 (g) ⇌ 2 NO (g) + O2 (g). If the initial partial pressure of NO2 (g) is 3.0 bar, and x is the equilibrium pressure of O2 (g), what is the correct equilibrium relation?
Sunday, March 22, 2015 at 8:21pm

Chemistry
I found this on the internet and I need an explanation. Q: You want to make sure a large weather balloon does not burst and wish to check the temperature at 3000 meters altitude. The balloon manufacture guarantees the balloon up to 60.0 Liters in size. Will the balloon make it...
Sunday, March 22, 2015 at 8:15pm

general chemistry
How many grams of NaOH are required to prepare 250 mL of 0.205 M NaOH? SHOW ALL WORK and include units. I don't know how to set this up.
Sunday, March 22, 2015 at 7:43pm

chemistry
Write a balanced chemical equation for the neutralization reaction between aqueous hydrochloric acid and aqueous calcium hydroxide. Be sure the formulas are written correctly before balancing, and include phases. HCl+H2CaO2 im not sure that's written correctly but that is ...
Sunday, March 22, 2015 at 7:19pm

Chemistry
A sodium chloride solution has a density of 1.22 g/mL. How many moles of NaCl are dissolved in 10.0 mL of the solution? The density of water is 1.00 g/mL. My solution: ? mol NaCl = 10 mL*1.22 g/1mL*1mL/58.5g The correct answer is 3.76*10^2 mol. Please help!
Sunday, March 22, 2015 at 7:02pm

Chemistry
If there are 57.6 mL of water that change from 19.4 degrees Celsius to 34.7 degrees Celsius, calculate the number of joules of energy transferred in the form of heat. Round to the nearest whole number. The specific heat capacity of water is 4.18 J/g*C and density of water is 1...
Sunday, March 22, 2015 at 6:50pm

Chemistry
0.24g of a volatile substance,upon vaporisation,gives 45ml vapour at NTP what will be the vapour density of the substance?
Sunday, March 22, 2015 at 6:19pm

CHEMISTRY
The average kinetic energy of an ideal gas,per molecule in S.I units at 25°C will be
Sunday, March 22, 2015 at 6:16pm

CHEMISTRY
At 25°C and 730 mm pressure,380 ml of dry oxygen was collected.If the temperature is constant ,what volume will the oxygen occupy at 760 mm pressure ? ANSWER- 365ml
Sunday, March 22, 2015 at 5:22pm

CHEMISTRY
The pressure exerted by 6.0g of methane gas in a 0.03m3 vessel at 129degreeC is.
Sunday, March 22, 2015 at 5:01pm

CHEMISTRY
A gaseous mixture was prepared by taking equal mole of CO and N2 .if the total pressure of the mixture was found 1 atmosphere ,the partial pressure of nitrogen (N2) in the mixture is.
Sunday, March 22, 2015 at 3:49pm

Chemistry
A 20.00 mL sample of a .1000M unknown acid solution is titrated with .1000M NaOH. Given that the acid is diprotic and its pKa's are 1.90 and 6.70 a.) Estimate the pH after 10 mL of base are added b.) estimate the pH after 20 mL of base are added c.) estimate the pH after ...
Sunday, March 22, 2015 at 3:03pm

Chemistry
Can someone please answer one of these question so I would be able to know how to do the others? 1. What volume of 0.275 M KOH (aq) must be added to 75.0 mL of 0.137 M H3AsO4 (aq) to reach (a) the first stoichiometric pony; (b) the second stoichiometric point 2. What volume of...
Sunday, March 22, 2015 at 1:05pm

Chemistry
If 20dm3 methane was burned in pure oxygen: CH4(g) + 2O2(g) arrow CO2(g) + 2H2O(l) how do I work out the volume of carbon dioxide made? And what volume of oxygen would be required? Thank you.
Sunday, March 22, 2015 at 12:57pm

Chemistry
How many milliliters of 0.258 M NiCl2 solution are needed to react completely with 20.0 mL of 0.153 M Na2CO3 solution? How many grams of NiCO3 will be formed? The reaction is Na2CO3(aq) +NiCl2 (aq)----> NiCO3(s)+2NaCl I solved for the 1st part, 11.8 M NiCl2 I am not sure ...
Sunday, March 22, 2015 at 8:48am

chemistry
269 mL of a 0.2089 M sodium carbonate (Na2CO3) solution is prepared and labelled "Solution A".
Sunday, March 22, 2015 at 3:17am

Chemistry
Can a pH be below 1?
Sunday, March 22, 2015 at 1:44am

chemistry
The average swimming pool has a volume of about 28,000 gallons. Suppose a swimming pool was filled with pH 7.00 water. However, you need to adjust the pH to 4.75. How much acid pool acid (which is 1.00 M HCl) do you need to add to the pool? The units are liters. convert ...
Saturday, March 21, 2015 at 11:55pm

chemistry
Hey, I'm struggling a bit with this thermal energy question: One major cost in the brewing history is the cost of energy used in running a plant. Much of the heating plant is accomplished by the cooling and or condensing of steam. When 50.0 mg of griest is heated from 25.0...
Saturday, March 21, 2015 at 11:34pm

Chemistry
The equilibrium constant, Kp, for the following reaction is 0.497 at 500 K: PCl5(g) PCl3(g) + Cl2(g) Calculate the equilibrium partial pressures of all species when PCl5(g) is introduced into an evacuated flask at a pressure of 1.46 atm at 500 K. PPCl5 = atm PPCl3 = atm PCl2...
Saturday, March 21, 2015 at 11:23pm

Chemistry 2
The equilibrium constant, Kc, for the following reaction is 1.54E-2 at 643 K. 2HI(g) H2(g) + I2(g) When a sufficiently large sample of HI(g) is introduced into an evacuated vessel at 643 K, the equilibrium concentration of I2(g) is found to be 0.351 M. Calculate the ...
Saturday, March 21, 2015 at 11:13pm

chemistry
You need to determine the pKa of a weak, monoprotic acid. You add 0.500 moles of the acid to 1.00 L of water. The resulting pH was 1.87. What is the pKa of this weak acid? You may ignore the autoionization of water. 2.74 3.43 5.38 2.01 1.87
Saturday, March 21, 2015 at 10:57pm

chemistry
All of the following acid-base pairs are examples of buffers EXCEPT: (Question from "Cracking the MCAT, 2010-2011 edition" by The Princeton Review) HCl/NaCl CH3CO2H/NaCH3CO2 HF/NaF H2CO3/NaHCO3 I chose ch3co2h/nach3co2
Saturday, March 21, 2015 at 10:03pm

chemistry
What is the pH of 500 mL of water that had 0.00150 grams of NaOH added to it? The units are pH units with an error interval of 0.1 units. 0.00150 divided by 40NaOH 3.75e-5 divided that by 500= 7.5e-8 -log7.5e-8 =7.12 im lost on the last step
Saturday, March 21, 2015 at 10:00pm

chemistry
If 350 grams of pure fe2o3 is used, how grams of can be produced? the reaction is: fe2+3c---2fe+3co
Saturday, March 21, 2015 at 9:55pm

chemistry
The Ka of hypochlorous acid (HClO) is 3.00×10-8 at 25.0°C. Calculate the pH of a 0.0385 M hypochlorous acid solution. a.1.41 b.7.52 c.-1.41 D.4.47 E. 8.94 I got B 7.52 but i feel like im wrong
Saturday, March 21, 2015 at 9:47pm

Chemistry 2
The equilibrium constant, Kc, for the following reaction is 1.54E-2 at 643 K. 2HI(g) H2(g) + I2(g) When a sufficiently large sample of HI(g) is introduced into an evacuated vessel at 643 K, the equilibrium concentration of I2(g) is found to be 0.351 M. Calculate the ...
Saturday, March 21, 2015 at 9:30pm

chemistry
A 300 mL solution of 0.0500 M HCl is titrated with 1.00 M KOH. How many mL of the KOH solution will be needed to reach the equivalence point of this titration? A.5 mL B.10 mL C.50 mL D20 mL E15 mL The answer i got was E. 15ml
Saturday, March 21, 2015 at 9:04pm

chemistry
I'm adding these three atomic weights (40.1+12.0+48.0) together, and I got 100.1 How can I round my answer to three significant figures? thank you!
Saturday, March 21, 2015 at 8:05pm

chemistry
Which of the following acids is expected to be the strongest acid? CH2F-COOH CF3-COOH CH3-COOH CCl3-COOH CBr3-COOH i chose ccl3-cooh
Saturday, March 21, 2015 at 8:03pm

Analytical Chemistry
Indicate whether the following half-cells would act as an anode or a cathode when coupled with a S.H.E. in a galvanic cell. Calculate cell potential: Pt/O2(800 torr)/HCl(2.5E-5 M) I have not figured out a way to approach this problem. I know the nernst comes in, but I am at a ...
Saturday, March 21, 2015 at 7:52pm

chemistry
Which of the following chemicals are bases or can behave like bases? You may select more than one compound. KOH PO43- NH3 F-
Saturday, March 21, 2015 at 7:45pm

chemistry
Which of the following chemicals are bases or can behave like bases? You may select more than one compound. Cu2+ RbOH CH3COO- Br-
Saturday, March 21, 2015 at 7:03pm

chemistry
Which of the following chemicals are strong bases? You may select more than one compound. CH2=CH2 Ca(OH)2 NH3 RbOH
Saturday, March 21, 2015 at 7:01pm

chemistry
The Ka of hypochlorous acid (HClO) is 3.00×10-8 at 25.0°C. Calculate the pH of a 0.0385 M hypochlorous acid solution. A.1.41 B.7.52 C.-1.41 D.4.47 E.8.94 I chose B
Saturday, March 21, 2015 at 6:53pm

chemistry
net ionic equation for reaction between copper carbonate and the hydroiodic acid
Saturday, March 21, 2015 at 6:09pm

Chemistry
At 500 degrees celsius, K for the formation of ammonia from nitrogen and hydrogen gases is 1.5x10-5. N2(g)+3H2(g)->/<-2NH3(g) Calculate the equilibrium partial pressure of hydrogen if the equilibrium partial pressures of ammonia and nitrogen are 0.015 atm and 1.2 atm, ...
Saturday, March 21, 2015 at 1:48pm

Chemistry
I am having difficulty with balancing this acidic solution; I2+OCl{-} ----> IO3{-} +Cl{-} I get: I2 = OCl{-} +2H2O -----> IO3{-} +Cl{-} + 3H{+} The charges don't balance... What am I doing wrong?
Saturday, March 21, 2015 at 12:12pm

Chemistry
A 10.0-mL solution of 0.300 M NH3 is titrated with a 0.100 M HCl solution. Calculate the pH after the following additions of the HCl solution: a) 0.00 mL b) 10.0 mL c) 20.0 mL c) 30.0 mL d) 40.0 mL **I know how to solve the problem but I keep getting answers that are exactly ...
Saturday, March 21, 2015 at 9:09am

science chemistry
Calculate the relative atomic mass of Limestone CaCo3 Methanol CH3oH Sulphric acid Ca(No3)2. (Ca=40.1,C=12,O=16,H=1,S=32).
Saturday, March 21, 2015 at 8:18am

chemistry
Calculate the volume of NaOH 0.1M that needs to be calculated to be added to a 30ml o-phosphoric acid 0.1 in order to prepare solutions of pH 7.5 and pH 6.9? pKa3= 2.15; pKa2=7.2; pKa1 = 12.1
Saturday, March 21, 2015 at 7:47am

Chemistry
You are titrating 50ml of a 0.02M solution of Zn^+2 at pH 7 with 0.05M solution of EDTA. What is the [Zn+2] after 20mL of EDTA has been added? Kzny=3x10^16
Saturday, March 21, 2015 at 5:47am

chemistry
Calculate ▲U,▲H, ▲S, ▲A and▲G in expanding 1 mole of ideal gas at 25 ° c from 10 to 100 dm cubed. (5marks )
Saturday, March 21, 2015 at 5:01am

chemistry
Distinguish clearly between ▲G for a reaction and ▲S of the same reaction. Which of the two is used to predict whether a reaction is spontaneous? why? (4 marks)
Saturday, March 21, 2015 at 4:53am

chemistry
The standard Gibbs free energy of formation of ammonia at 25 ° c is - 16.5kj per mole.calculate the value of equilibrium constant Kp at this temperature for this reaction. ( 5marks )
Saturday, March 21, 2015 at 4:43am

Chemistry
How many grams of CO(g) are there in 67.0mL of the gas at 0.826atm and 30 ∘C?
Friday, March 20, 2015 at 11:58pm

chemistry
Consider the following reaction. SO3(g) + H2O(l) → H2SO4(aq) A chemist allows 60.9 g of SO3 and 11.1 g of H2O to react. When the reaction is finished, the chemist collects 54.4 g of H2SO4. Determine the limiting reactant, theoretical yield, and percent yield for the ...
Friday, March 20, 2015 at 8:39pm

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