1. Chemistry help please!!!

    Experimental Procedure, Part F. A 1.0- mL volume of 0.010 M H2SO3 is added to a mixture of 12 drops of 0.01 M HIO3, 8 drops of deionized water, and 1 drop of starch solution. A color change in the reaction mixture occured in 40 seconds. a. Assuming 25

    asked by john on January 27, 2011
  2. chemistry

    In a reaction involving the iodination of acetone, the following volumes were used to make up the reaction mixture: 10 mL 5.0 M acetone + 10 mL 1.5 M HCl + 10 mL 0.005 M I2 + 20 mL H2O A student found that it took 400 seconds for the color of the I2 to

    asked by leticia on March 5, 2015
  3. Chemistry

    When 0.13 g of H2 and 0.18 g of I2 are confined to a 150. mL reaction vessel and heated to 700. K, they react by a second-order process (first order in each reactant), with k = 0.063 L·mol-1s-1 in the rate law (for the rate of formation of HI). (a) What

    asked by Sara on June 28, 2013
  4. chemistry

    If 1.00 mol of iodine and 0.50 mol of chlorine are initially placed into a 2.00 L reaction vessel at 25 degrees celsius, find the concentrations of all entities at equilibrium

    asked by Kelsy on April 8, 2008
  5. science

    Calculate the pH of a solution created by mixing 200.0 mL of 0.400 M acetic acid and 200.0 mL of 1.00 M sodium acetate. Hint: The instant the two solutions are mixed what are the initial concentrations of each?

    asked by Bruce on February 14, 2011
  6. chemistry

    What are the concentrations of [H+] and [OH-] in each of the following. Determine the pH and pOH for each solution. A. 1.25 M HCl B. 0.25 M NaOH C. 0.035 M Ca(OH)2 D. 0.50 M HNO3 I know how to do the pH and pOH I just do not know how to figure out the both

    asked by Anna on April 28, 2010
  7. chemistry

    Gaseous CO2 decomposes to form the gaes CO and O2. At 20.0 degrees Celsius, =2.0*10^-8. 2.0 mol carbon dioxide is placed in a 5.0 L flask. What are the equilibrium concentrations of each species. My attempt to get the answer: Balanced equation: 2CO2-->

    asked by Anonymous on March 2, 2009
  8. CHEMISTRY

    Method for getting correct answer? Thank you! Initially there were equilibrium concentrations of 0.1887 M A, 0.1042 M B. Which of the equations below is correct if the pressure decreased by a factor of 2.40? Use the reaction below. 6A(g) ↔ 5 B(g) a. Qc =

    asked by Chemistry on April 6, 2014
  9. CHEMISTRY

    Method for getting correct answer? Thank you! Initially there were equilibrium concentrations of 0.1887 M A, 0.1042 M B. Which of the equations below is correct if the pressure decreased by a factor of 2.40? Use the reaction below. 6A(g) ↔ 5 B(g) Qc =

    asked by Chemistry on April 6, 2014
  10. chemistry(please check)

    Just made it a new post didn't what it to get overcrowning.I hope this will help us figure out now For questions #1 through #10, refer to the following equilibrium system, with a Kc of 1.23E-03: C3H6O (aq) + 2C2H6O(aq)----> C7H16O2 (aq) + 2H2O (l) 1. What

    asked by cateye on April 23, 2012
  11. Chemistry

    A chemical reaction occurring in a cylinder equipped with a movable piston produces 0.58 mol of a gaseous product. If the cylinder contained 0.11 mol of gas before the reaction and had an initial volume of 2.1 L, what was it's volume after the reaction. Am

    asked by Monique on October 14, 2011
  12. Arrhenius Reaction

    The activation energy of a certain reaction is 32.9 kJ/mol At 25 degrees C the rate constant is 0.0160 units s-1 units. At what temperature in degrees Celsius would this reaction go twice as fast? Given that the initial rate constant is 0.0160 s-1 at an

    asked by Amy on January 30, 2013
  13. cheMistry

    a) Silver iodide(s) is formed by the following reaction: Ag (aq) + I (aq) --> AgI (s) The Ksp for AgI = 1.8 x 10^-10 Describe, using the chemical reaction, the mathematical formula for these ions. Assuming these ion concentrations are equal, what would the

    asked by hank on November 1, 2015
  14. chem

    a) Silver iodide(s) is formed by the following reaction: Ag (aq) + I (aq) --> AgI (s) The Ksp for AgI = 1.8 x 10^-10 Describe, using the chemical reaction, the mathematical formula for these ions. Assuming these ion concentrations are equal, what would the

    asked by hank on November 2, 2015
  15. chemistry

    Suppose that the reaction of Fe3+ and SCN- produces Fe(SCN)2 (+). 5.00mL of 2.0mM Fe3+ is mixed with 5.00 mL of 2.0mM SCN-. The student finds the equilibrium concentrations of Fe(SCN)2(+) to be 0.3mM. 1.) What is the initial number of moles of each species

    asked by paula on February 24, 2015
  16. science

    passive transport involves movement of substances...... A) from areas of lower concentration areas of higher concentrations. B)from areas of higher concentrations to areas of lower concentration C) from areas which the concentration has reached a balance

    asked by KK on January 26, 2015
  17. Chemistry

    Currently studying for an lab exam. Just have a few question about a typical Iodine Clock reaction lab. In an typical Iodine Clock reaction lab what would be the state of effect of an increase in the initial concentration of thiosulfate ion (S2O3 2-) and

    asked by AhmadM on February 15, 2013
  18. CHEM

    When 0.5 mole of CO2 and 0.5 mole of H2 were forced into a litre reaction container, and equilibrium was established: CO2(g) + H2(g) H2O (g) + CO (g) Under the conditions of the experiment, K=2.00 a) Find the equilibrium concentration of each reactant and

    asked by Anonymous on April 11, 2012
  19. chemistry

    I2(g)+Cl2(g)->

    asked by jennifer on June 7, 2015
  20. chemistry

    A 0.239 mol sample of PCl5(g) is injected into an empty 2.85 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and PCl3(g) at equilibrium.

    asked by layla on May 3, 2015
  21. chemistry

    A dilution is made during the preparation of a reaction mixture. The compounds are: 2.00 ml of 0.325 KMnO4, 7.50 ml of 0.155 M Oxalic acid, and 10.00 ml of H2O. What are the final concentrations of the compounds?

    asked by Yubellkis on February 5, 2017
  22. Chemistry

    The reaction OH- + NH4+ = H20 + NH3 is kinetically first order in both reactants' concentrations. The rate constant is 2e10 1/M s. If 50 ml of .01 M NaOH is mixed with 50 ml of .01 M NH4CL, find the time required for the OH- concentration to reach 1e-4 M.

    asked by Anonymous on March 19, 2014
  23. Chemistry Equilibrium

    At 500 ºC, the decomposition of water into hydrogen and oxygen, 2H2O(g) 2H2(g) + O2(g) has Kc = 6.0 × 10-28. What are the concentrations of H2 and O2 that are present at equilibrium in a 2.00 L reaction vessel at this temperature if the container

    asked by Anonymous on April 10, 2014
  24. Chemistry

    Consider the decomposition reaction: AB(g)-->A(g)+B(g). The rate law for the reaction is: rate=k[AB]^2, where k=0.00846 M^-1 min^-1. After 5.25 hours, what is the percent of AB that decomposed if the initial concentration is 2.00 M?

    asked by Ceamus Angelina on June 29, 2018
  25. chem

    If it takes 84.2 min for the concentration of a reactant to drop to 20.0% of its initial value in a first-order reaction, what is the rate constant for the reaction in the units min-1?

    asked by ted on April 14, 2013
  26. Chemistry

    A voltaic cell consists of Ag/Ag+2 electrode E= 0.80 and a Fe+2/Fe+3 electrode E=0.77 with the following initial molar concentrations: [Fe+2}= 0.30 M [Fe+3]= 0.10 M [Ag+]=0.30 M. What is the equilibrium concentration of Fe+3? (Assume the anode and the

    asked by Jackie on July 20, 2012
  27. Chemistry

    The extracellular concentrations of Na+ and K+ are 135mM and 6mM, respectively. The intracellular concentrations of Na+ and K+ are 10mM and 105mM, respectively. The membrane potential is 75mV. For Na+/K+ ATPase, 3Na+ are exported and 2K+ are imported.

    asked by Drew on September 30, 2013
  28. CHEMISTRY

    The extracellular concentrations of Na+ and K+ are 135mM and 6mM, respectively. The intracellular concentrations of Na+ and K+ are 10mM and 105mM, respectively. The membrane potential is 75mV. For Na+/K+ ATPase, 3Na+ are exported and 2K+ are imported.

    asked by Izabella on September 26, 2013
  29. Chemistry

    The extracellular concentrations of Na+ and K+ are 135mM and 6mM, respectively. The intracellular concentrations of Na+ and K+ are 10mM and 105mM, respectively. The membrane potential is 75mV. For Na+/K+ ATPase, 3Na+ are exported and 2K+ are imported.

    asked by Kam on September 29, 2013
  30. Chemistry

    Estimate the rate of the reaction, H2SeO3 + 6I- + 4H+ Se + 2I3- + 3H2O given that the rate law for the reaction at 0°C is rate = (5.0 × 10^5 L5mol-5s-1)[H2SeO3][I-]^3[H+]^2 The reactant concentrations are [H2SeO3] = 1.5 × 10^-2 M, [I-] = 2.4 × 10^-3 M,

    asked by Is my answer right? on February 1, 2015
  31. Chemistry

    Consider the reaction A ==> B. If the reaction is first-order in A with the initial concentration A being 6.048M, what is the concentration of A after 1.986 seconds if the rate constant is 0.483s-1? Error tolerance: ±0.5% Can someone explain how to do

    asked by Marisol on February 7, 2007
  32. chemistry

    A 0.411 mol sample of PCl5(g) is injected into an empty 4.65 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and PCl3(g) at equilibrium.kc=1.80 at 250c

    asked by muna on November 10, 2013
  33. Gen Chem

    Consider the following reaction, A B in a 1.00L container. At 1.77°C, the molar concentrations of A and B, respectively, 5.838M and 3.945M. Suddenly, 8.744 moles of A are added to the system. What is the change in DG of the system? Give the answer in kJ?

    asked by Sarah H on March 29, 2008
  34. Gen Chem

    Consider the following reaction, A B in a 1.00L container. At 1.77°C, the molar concentrations of A and B, respectively, 5.838M and 3.945M. Suddenly, 8.744 moles of A are added to the system. What is the change in DG of the system. Give the answer in kJ?

    asked by Sarah H on March 28, 2008
  35. chemistry

    1. A three-step mechanism has been suggested for the formation of carbonyl chloride: Step 1: Cl2 ===> 2 Cl (fast equlibrium) Step 2: Cl + CO ===> COCl (fast equilibrium) Step 3: COCl + Cl2 ===> COCl2 + Cl (slow) What is the molecularity of the

    asked by Issac on February 10, 2007
  36. Chemistry

    The rate of a first-order reaction is followed by spectroscopy, monitoring the absorption of a colored reactant at 520 nm . The reaction occurs in a 1.29-cm sample cell, and the only colored species in the reaction has an extinction coefficient of 5700

    asked by Leslie on January 27, 2013
  37. Chemistry

    The rate of a first-order reaction is followed by spectroscopy, monitoring the absorption of a colored reactant at 520 nm . The reaction occurs in a 1.29-cm sample cell, and the only colored species in the reaction has an extinction coefficient of 5700

    asked by Leslie on January 27, 2013
  38. chemistry--last time i promise

    CO(g) + H2O(g)-->CO2 + H2 (g) reaction occurs in a 2.0 Ll reactor at 800 degrees celsius. The reaction conditions are such that a complete conversion of reactants into products results. The reactor is charged initially with 5.0 atm of CO and 8.0 atm of

    asked by alexis on May 4, 2015
  39. Chemistry

    If the initial rate of reaction is observed to increase by a factor of nine when the concentration of a reactant is tripled, what is the order of reaction with respect to that reactant? a)0 b)1 c)2 d)3 e)5 I think it's c am i right? Explain in case i'm

    asked by Sarah on July 26, 2010
  40. science/ chemistry

    Over 80 000 vehicles per day pass the site and the traffic is frequently congested. The surrounding area is described as forming a street canyon. The temperature at the site had reached 25 °C by 08:00, when the ethane concentration was recorded as 7.09

    asked by Nicolas on September 14, 2008
  41. AP Chemistry

    Consider the following reaction. CaSO4(s) Ca2+(aq) + SO42-(aq) At 25°C the equilibrium constant is Kc = 2.4 10-5 for this reaction. (a) If excess CaSO4(s) is mixed with water at 25°C to produce a saturated solution of CaSO4, what are the equilibrium

    asked by Olivia on October 20, 2012
  42. Chemistry

    Calculate the concentrations of S2O8 2-, I-, S2O32 2- in moles per litre of reaction mixture given the following: 20mL of 0.1 M (NH4)2S2O8 added to: 20mL of 0.2M KI 10mL of 0.01M Na2S2O3 5mL 0.2% starch Also, calculate -(delta)S2O8 2- that is, how much

    asked by Rachel on January 24, 2011
  43. CHEMISTRY

    A second-order reaction has a rate constant of 1.65 M–1 s–1. If the initial reactant concentration is 1.0 M, calculate the time (in seconds) required for the reaction to become 90% complete. i got 0.06734 seconds but that's incorrect i have no idea

    asked by Maya on March 29, 2012
  44. Chemistry

    At 25°C, K = 0.090 for the following reaction. H2O(g) + Cl2O(g) equilibrium reaction arrow 2 HOCl(g) Calculate the concentrations of all species at equilibrium for the following case. 1.3 mol pure HOCl is placed in a 1.6 L flask [HOCl]________

    asked by Ann on February 27, 2012
  45. chemistry

    Calculate each of these equilibrium concentrations based on the reaction below. 2 NO(g) + O2(g) 2 NO2(g) K = 1.71 1012 (a) [NO] = 0.0048 M; [O2] = 0.000057 M; [NO2] = ? (b) [NO] = 0.0026 M; [O2] = 0.000023 M; [NO2] = ?

    asked by Anonymous on September 12, 2011
  46. chemistry

    Calculate each of these equilibrium concentrations based on the reaction below. 2 NO(g) + O2(g) 2 NO2(g) K = 1.71 1012 (a) [NO] = 0.0048 M; [O2] = 0.000057 M; [NO2] = ? (b) [NO] = 0.0026 M; [O2] = 0.000023 M; [NO2] = ?

    asked by Anonymous on September 12, 2011
  47. ap chem

    At 350 K, Kc = 0.142 for the reaction 2BrCl(g) *) Br2(g) + Cl2(g) An equilibrium mixture at this temperature contains equal concentrations of bromine and chlorine, 0.067 mol/L. What is the equilib- rium concentration of BrCl? Answer in units of M.

    asked by Anonymous on February 13, 2011
  48. ap chemistry

    At 350 K, Kc = 0.142 for the reaction 2BrCl(g) *) Br2(g) + Cl2(g) An equilibrium mixture at this temperature contains equal concentrations of bromine and chlorine, 0.069 mol/L. What is the equilib- rium concentration of BrCl? Answer in units of M

    asked by cheri on January 29, 2013
  49. AP Chem

    At a particular temperature, K = 1.00 102 for the following reaction. H2(g) + I2(g) 2 HI(g) In an experiment, 1.23 mol H2, 1.23 mol I2, and 1.23 mol HI are introduced into a 1.00 L container. Calculate the concentrations of all species when equilibrium is

    asked by Bill on January 8, 2012
  50. chemistry

    At 35°C, Kc = 1.6 X 10-5 M for the reaction 2NOCI(g) 2NO(g) + Cl2 (g)' Calculate the concentrations of all species at equilibrium for each of the following systems. Note any simplifying assumptions made in the calculations. 3.0 mol NO(g) and 1.0 mol

    asked by airman on December 6, 2014
  51. Chemistry

    When 442 mg of NO2 is confined to a 150. mL reaction vessel and heated to 300°C, it decomposes by a second-order process. In the rate law for the decomposition of NO2, k = 0.54 1/(M·s). A) what is the initial reaction rate? B) what is the reaction rate

    asked by Val on April 1, 2010
  52. Chemistry

    Nitrogen Monoxide reacts with hydrogen gas to form nitrogen gas and water (vapor). (i). write a balanced equation for this reaction. (ii). The reaction is experimentally found to be (approx) first-order in H2 and second order in in NO. Write the form if

    asked by Crystal on April 14, 2012
  53. Biochem

    Glycerol 3-phosphate dehydrogenase catalyzes the reversible reaction: G3P + NAD+ --> NADH + H+ + DHAP If in the cell, the concentrations of G3P, NAD+, NADH, and DHAP are 2 mM, 4 mM, 6 mM, and 8 mM respectively. Determine if the reaction spontaneous as

    asked by Mia S on December 8, 2015
  54. Chemistry

    A 5.80 g sample of SiH4 and an excess of oxygen were placed in a reaction container surrounded by 3.40 kg of water. The initial temperature of the water was 14.10°C. At the end of the reaction, the temperature of the water was 48.90°C. Assume the heat

    asked by Megan on March 8, 2010
  55. College Chemistry

    Consider the following reaction, equilibrium concentrations, and equilibrium constant at a particular temperature. Determine the equilibrium concentration of SO2(g). 2SO2(g)+O2(g)=2SO3(g) Kc=1.7*10^8 [SO3]aq=0.0034 M [O2]aq=0.0018 M

    asked by Timothy urgent need on December 10, 2013
  56. Chemistry

    Consider the following reaction, equilibrium concentrations, and equilibrium constant at a particular temperature. Determine the equilibrium concentration of SO2(g). 2SO2(g)+O2(g)=2SO3(g) Kc=1.7*10^8 [SO3]aq=0.0034 M [O2]aq=0.0018 M

    asked by Timothy urgent need on December 10, 2013
  57. Chemistry

    2 Al(s) + 3 Cl2(g) → 2 AlCl3(s) Into a cylinder with a moveable piston (pressure stays constant), a piece of aluminum is placed and chlorine gas is added. After they react, the temperature inside the piston is considerable higher than its initial

    asked by tatyana on October 15, 2017
  58. Chemistry

    2 ml of 1M HCl 0 ml of H2O 3ml of .3M Na2S2O3 How do I find the initial and final concentrations of both HCl and Na2S2O3?

    asked by Nicole on January 8, 2013
  59. Chem

    Calculate ΔGo (in J) for 1 moles of electron(s) in each half-reaction and a standard potential of 0.34 V. I got .86 Calculate Keq for 2 moles of electron(s) in each half-reaction and a standard potential of (-0.44) V. I got -.36 Calculate the potential

    asked by Anonymous on April 11, 2013
  60. Chemistry

    1) You are given solutions of HCl and NaOH and must determine their concentrations. You use 37.0mL of NaOH to titrate 100mL of HCl and 13.6 mL of NaOH to titrate 50.0mL of 0.0782 M H2SO4. Find the unknown concentrations. Molarity of NaOH and molarity of

    asked by Ashley on October 4, 2010
  61. college

    1) You are given solutions of HCl and NaOH and must determine their concentrations. You use 37.0mL of NaOH to titrate 100mL of HCl and 13.6 mL of NaOH to titrate 50.0mL of 0.0782 M H2SO4. Find the unknown concentrations. Molarity of NaOH and molarity of

    asked by Ashley on October 4, 2010
  62. chemistry

    For the reaction 2A(g) + B(aq) + 3C(l) D(s) + 3E(g), the concentrations at equilibrium are found to be: A: 2.3x10^3 Pa B: 1.8x10^-2 M C: 15.8M D: 12.5M E: 5.6x10^4 Torr Find the numerical value of the equilibrium constant that would appear in a

    asked by Ashley on March 10, 2013
  63. Physics

    To stop a car, you require first a certain reaction time to begin braking. Then the car slows under the constant braking deceleration. Suppose that the total distance moved by your car during these two phases is 56.7 m when its initial speed is 80.0 km/h,

    asked by Bob on October 3, 2010
  64. chemistry (DrBob222)

    Calculate the value of Ecell for the reaction of cobalt(II) chloride and zinc metal, given the specific concentrations listed. Zn(s) | Zn2+(0.21 M) || Co2+ (0.21 M) | Co(s) Okay, so I keep getting -1.04 and -1.06 when I do this problem. I have used log

    asked by Anonymous on November 21, 2011
  65. chemistry (DrBob222)

    Calculate the value of Ecell for the reaction of cobalt(II) chloride and zinc metal, given the specific concentrations listed. Zn(s) | Zn2+(0.21 M) || Co2+ (0.21 M) | Co(s) Okay, so I keep getting -1.04 and -1.06 when I do this problem. I have used log

    asked by Anonymous on November 21, 2011
  66. Chemistry

    Consider the titration of 50mL of 2.0M HNO3 with 1.0M KOH. At eah step, add the following: 0ml, 25ml, 50ml. a) Write a reaction to show the initial reaction b)ICE table c) determine the spectators present after d)Calculate the pH

    asked by Gub on April 6, 2016
  67. Chemistry

    Write a procedure to demonstrate the effect of higher concentrations of HCl on its rate of reaction with antacid tablets. I have HCl with a concentration of 1.0 mol/L. This is what I have so far. Are my concentrations correct for this procedure? E is my

    asked by Carolyn on May 22, 2013
  68. Chemistry...HELP!!!!

    In a reaction in which A + B yields AB, the reaction is referred to as a _________. A. decomposition reaction B. double-replacement reaction C. combustion reaction D. composition reaction i think is a

    asked by Jason on September 17, 2010
  69. Chemistry

    In a reaction in which A + B yields AB, the reaction is referred to as a _________. A. decomposition reaction B. double-replacement reaction C. combustion reaction D. composition reaction

    asked by Jason on September 17, 2010
  70. Organic Chemistry

    The Diels-Alder reaction is classified as a: A. polar reaction B. radical reaction C. substitution reaction D. pericyclic reaction E. rearrangement reaction

    asked by nilee on March 6, 2009
  71. Chemistry

    At a given temperature, a first-order reaction has a rate constant of 3.5 ´ 10–3 s–1. How long will it take for the reaction to be 24% complete? A chemical reaction that is first-order in X is observed to have a rate constant of 2.20 ´ 10–2 s–1.

    asked by Juli on November 18, 2014
  72. chem 12

    consider the following equilibrium 2NOCl(g)--- 2 NO(g) + Cl2(g) Initally 1.00 mol of NO and 1.00 mol of Cl2 are placed in a 5.00L container. Calculate the initial concentrations of NOCl, NO and Cl2 NO= 0.20 mol/L Cl2= 0.20 mol/l NOCl=0 At equilibrium it is

    asked by George on March 8, 2016
  73. AP Chemistry

    At 350 K, Kc= 0.142 for the reaction 2BrCl(g) Br2(g) + Cl2(g) An equilibrium mixture at this temperature contains equal concentrations of bromine and chlorine, 0.049 mol/L. What is the equilibrium concentration of BrCl? Answer in units of M

    asked by Gabriella on November 27, 2013
  74. science

    pftba is found in extremely low concentrations (0.18 parts per trillion) but it has a great impact on climate. if pftba concentrations increase, predict what will happen to the climate

    asked by sam on November 12, 2015
  75. science

    Perfluorotributylamine (PFTBA) is found in extremely low concentrations (0.18 parts per trillion) but it has a great impact on climate. If Pftba concentrations increase, predict what will happen to the climate. Please help?

    asked by sam on November 13, 2015
  76. CHEMISTRY

    The data below has been taken for the reaction of a dye with the hydroxide ion. The reaction was performed at two different hydroxide ion concentrations while the dye concentration was kept constant. What is the rate law? [OH─] = 0.10 M [OH─] = 0.20 M

    asked by Aparna on March 18, 2014
  77. Chemistry Question

    The reaction of quicklime (CaO) with sulfur dioxide (SO2) is an important reaction for reducing SO2 emissions from coal-fired power plants: CaO(s) + SO2(g) → CaSO3(s) This reaction is an example of: A. a precipitation reaction B. an electrolysis reaction

    asked by M on March 29, 2012
  78. Chemistry

    The equilibrium constant, Keq, is defined as the ratio of the concentrations of products to reactants. What is the equilibrium constant for the following reaction: ClNO2 (g) + NO (g) ↔ NO2 (g) + ClNO (g)

    asked by Tamera on November 11, 2014
  79. Chemistry

    At a particular temperature, K = 2.0 10-6 mol/L for the following reaction. 2 CO2(g) 2 CO(g) + O2(g) If 1.8 mol CO2 is initially placed into a 5.9-L vessel, calculate the equilibrium concentrations of all species.

    asked by Elizabeth on February 21, 2012
  80. chemistry

    Heterogenous equilibrium of ammonium bisulfide. Ammonium bisulfide NH4HS forms ammonia NH3 and hydrogen sulfide H2S through the reaction NH4HS(s) arrows + H2S(g). This reaction has a kp value of 0.120 at 25 C. A 5.0-L flask is charged with .400g of pure

    asked by gin on March 13, 2011
  81. Chemistry

    What are the concentrations of Cu^2+, NH3, and Cu(NO3)4^2+ at equilibrium when 18.8 g of Cu(NO3)2 is added to 1.0 L of a .400 M solution of aqueous ammonia? Assume that the reaction goes to completion and forms Cu(NH3)4^2+.

    asked by Jamila on March 18, 2015
  82. chemistry

    The half-life of a reaction was found to be inversely dependent on the concentration of the starting material. Thus, we can say that a. the reaction is zero order b. the reaction is first order c. the reaction is second order d. the reaction starts out

    asked by elvis on February 19, 2012
  83. chemistry

    The half-life of a reaction was found to be inversely dependent on the concentration of the starting material. Thus, we can say that a. the reaction is zero order b. the reaction is first order c. the reaction is second order d. the reaction starts out

    asked by elvis on February 19, 2012
  84. chemistry

    At 674.5 K the equilibrium concentrations of N2, H2, and NH3 were 0.1614 M, 0.1128 M, and 0.005892 M, respectively. What is the equilibrium constant for the reaction below? 2 NH3(g) → N2(g) + 3 H2(g)

    asked by Andy on May 6, 2014
  85. Chemistry

    The rate law of a reaction, A-> B+C is given by the expression: Rate=k, where k=0.0113 mol/L min. If the initial concentration of the reactant is 0.225 mol/L, how long does it take for the concentration to decrease to 0.180 mol/L? I know i have to find the

    asked by James on September 15, 2010
  86. chem 12

    1.00 mol of N2O4 and 1.00 mol of NO2 are placed in an 800 mL container. Calculate the initial concentrations of each gas. N2O4= 1.25 mol/L NO2=1.25 mol/L When equilibrium is reached, the concentration of NO2 increases by 0.50mol/L. Calculate the

    asked by George on February 7, 2016
  87. Chemistry

    For the reaction of hydrazine (N2H4) in water, Kb is 3.0 10-6. H2NNH2(aq) + H2O(l) H2NNH3+(aq) + OH -(aq) Calculate the concentrations of all species and the pH of a 2.2 M solution of hydrazine in water. okay so i don't know how to do this problem because

    asked by Lori on February 15, 2009
  88. chemistry kinetics

    The reaction SO2Cl2(g) → SO2(g) + Cl2(g) is a first order reaction carried out at constant volume at 600 K whose t1/2 is 4.1 hr. The initial pressure of SO2Cl2 is 1.25 atm. What will be the total pressure of the system after 1 hour?

    asked by swa on May 24, 2012
  89. Chemistry

    if the initial concentration of the reactant in the first order reaction A→products is 0.64 mol/L and the half-life is 30 s, calculate the concentration of reactant 120 s after initiation of the reaction

    asked by saud on November 18, 2011
  90. Science

    An investigation was conducted to study the effect of the concentration of a reactant on the (trial) time need to complete a chemical reaction. Four trials of the same reaction were performed.In each trial the initial concertration of the reactant was

    asked by Dena Cali on February 6, 2007
  91. Chemistry

    You are staying the reaction A2 (g)+B2 (g)=2AB (g) To determine its rate law .Assuming that you have a valid experimental procedure for obtaining (A2)& (B2) at various times, explain how you determine (a)the initial, (b) the reaction order, & (c) the rate

    asked by Munavvar on February 28, 2015
  92. Chemistry

    At 350 K, Kc = 0.142 for the reaction 2 BrCl(g) ⇀↽ Br2(g) + Cl2(g) An equilibrium mixture at this temperature contains equal concentrations of bromine and chlorine, 0.077 mol/L. What is the equilibrium concentration of BrCl?

    asked by Matthew on April 23, 2016
  93. chem

    1) If more reactant is added to a gaseous reaction at equilibrium, what will happen to the value of the equilibrium constant? a. it will increase b. it will decrease c. it will remain the same d. it can either increase or decrease 2) Which of the following

    asked by HEATHER on February 2, 2012
  94. Chemistry

    I need to calculate the mass of CO2 produced in the reaction of NaHCO3 + HCl Data Mass of NaHCO3 = .05g Mass of system before reaction 117.9 g Mass of system after reaction 117l98 Maxium pressure 1.4094 initial pressure 1.0094 pressure change .4 temp

    asked by Sarah on June 25, 2014
  95. science

    I posted this before but i realized i posted somethings that were wrong. mosquito larvae can tolerate extremely low dissolved oxygen concentrations, yet cannot survive at temperatures above 25 degrees celcius. how might you account for dissolved oxygen

    asked by cara on September 13, 2009
  96. Dr. BOB chemistry help please!

    hi At a particular temperature, K = 1.00 102 for the following reaction. H2(g) + I2(g)= 2 HI(g) In an experiment, 1.73 mol H2, 1.73 mol I2, and 1.73 mol HI are introduced into a 1.00 L container. Calculate the concentrations of all species when equilibrium

    asked by Enrique on January 18, 2009
  97. Chemistry

    A 1.0 mL volume of 0.010 M H2SO4 is added to a mixture of 6 drops of 0.010 M HIO3, 14 drops of deionized water, and 1 drop of starch solution. A color change in the reaction mixture occurred after 56 seconds. a. Assuming 20 drops per milliliter for all

    asked by Aly on February 3, 2016
  98. SCIENCE 1

    Which of the following is a true statement about chemical equilibria in general A.there is only one set of equilibrium concentrations that equal the Kc value B.eqauilibrium is the result of cessation of all chemical change C.at equilibrium the rate of the

    asked by Dave on May 11, 2010
  99. Chemistry

    Question: 50cm3 of 0.4 M Ba(OH)2 and 50cm3 of HA of unknown concentration is added together.At 25°C,pH of the solution is 9.With appropriate assumptions calculate the [HA] and ka of HA. My thoughts on the question: There are more than one approach which

    asked by Shenaya on May 28, 2017
  100. Chemistry

    Currently studying for an lab exam. Just have a few question about a typical Iodine Clock reaction lab. In an typical Iodine Clock reaction lab what would be the state of effect of an increase in the initial concentration of persulfate ion (S2O3 2-) and

    asked by AhmadM on February 15, 2013