1. Chemistry

    If 2.40 g of CuSO4 is dissolved in 8.57 x 10^2 mL of 0.360 M NH3, calculate the concentrations of Cu^2+, NH3, and Cu(NH3)4^2+???? Don't even know where to start.

    asked by Jessica on March 24, 2009
  2. chemistry

    A student measured the optical rotation of his sample at two different concentrations. At 0.14 g/mL, he measured áD at –12°. At 0.07 g/mL, he measured áD = +174°. What would the measurement be at 0.28 g/mL?

    asked by lisa on November 26, 2009
  3. Instrumental Chem Lab

    I am working on a HPLC lab where we are to determine the concentration of caffeine in two energy drinks. I am trying to figure out the concentrations but don't think I am doing it right. Below is the info from our chromatograms: Standard Caffeine peak area

    asked by Wheaties on April 16, 2011
  4. calculus

    The position function for a particular object is s = –23t^2 + 65. Which of the following statements is true? The initial position is 23 The initial velocity is 0 The velocity at time t = 1 is 42 None of these

    asked by Anonymous on December 8, 2016
  5. physics

    What potential difference is required to reduce the initial speed of the proton by a factor of 2? A proton has an initial speed of 3.1×105 m/s .

    asked by Natalie on February 4, 2016
  6. AE is this correct?

    determine the teachercertification/licensure requirements for the state you would like to teach in. I picked wisconsin and i put this...... Initial In-State Teaching or Pupil Services - PI-1602-IS Graduates of Wisconsin educator preparation programs only.

    asked by scooby91320002 on March 6, 2009
  7. chemistry

    operating conditions 250-300 celcius and 50-100 atmospheres are consistent with the aims of achieving a high equilibrium yield of methanol and a high rate of production. noting any conflicts, explain the role of a copper catalyst noting how its presence

    asked by c on March 20, 2007
  8. chemistry

    The initial concentration for the compounds involved in the reaction displayed were determined to be [BrI(g)] = 0.3220 mol/L, [Br2(g)] = 0.3287 mol/L, [I2(g)] = 0.004086 mol/L. Calculate the value of the equilibrium constant (Kc) at 423.0 K if the

    asked by Angel on February 21, 2010
  9. science

    Phosphoric acid is very important compound used to make fertilizers.PPhosphoric acid can be prepared in two ways: Reaction 1: P4 + 5O2 = P4O10. Reaction 2: P4O10 + 6H29 = 4H3PO4. Supposing we allow 272 g of phosphorus to react with excess oxygen which

    asked by Elijah on May 18, 2016
  10. science

    sorry to annoy anyone, but WHAT is the big idea of energy? i would really appreiciate a response In what context? Too much use. Not reneewable? Cost? availability? in the context of an ironsulphide reaction I still don't understand the question. explaining

    asked by Fiona on April 25, 2007
  11. AP Chemistry

    A mixture of 20.0 grams of CaO and BaO is placed in a 12.5 L vessel at 200oC with excess CO2 . The mixture is allowed to react to completion forming CaCO¬3 and BaCO3 .The pressure in the container after reaction is 220 torr. The solid carbonates are

    asked by Jim on January 3, 2015
  12. Chemistry

    The reaction 2NO (g) + 2H2 -> N2 (g) + 2H2O (g) was found to follow the rate law, rate = k[NO]^2[H2]. By what factor will the rate of reaction increase when the pressure of NO gas is increased from 2.0 atm to 3.0 atm? Assume all other conditions are held

    asked by Mikey on July 14, 2016
  13. Chem

    2 H2O (l) → 2 H2 (g) + O2 (g) Using the thermodynamic values to calculate accurate values of ΔHr and ΔSr, will the reaction be product favored at high temperature? Why? r stands for reaction

    asked by Melissa on November 6, 2010
  14. Biochemistry

    Is there a reaction between Na2SO4 with Ch2Cl2? We did a caffeine extraction from tea bags and we are asked why the Na2So4 was added (to remove water I learned) and if a reaction took place. Can someone help? Thanks!

    asked by Scott on November 27, 2008
  15. Chemistry

    2 NO + O2 --> 2 NO2 The reaction rate is increased five­fold when the temperature is  increased from 1400 K to 1500 K. What is the activation energy for the reaction?  I have no idea how to do this and would greatly appreciate some

    asked by Neha on November 16, 2011
  16. Chemistry

    Calcium fluoride (CaF2) is a slightly soluble salt, which dissociates in water according to the following reaction: CaF2(s) ⇌ Ca2+(aq) + 2F–(aq) What is the solubility product constant for this reaction?

    asked by Summer on March 27, 2018
  17. Physics

    What type of reaction is CS2(g)+O2(g)= CO2(g)+S2O4(aq)+HEAT? A) Synthesis B) Decomposition C) Single Replacement D) Double Replacement E) Combustion F) Redox Reaction Thank You ^_^/ I really appreciate it!

    asked by Claire on December 8, 2011
  18. chemistry

    The following reaction was monitored as a function of time: AB--->A +B A plot of 1/[AB] versus time yields a straight line with slope 5.2 x 10^-2 M*s. What is the value of the rate constant (k) for this reaction at this temperature?

    asked by Ellen on July 17, 2010
  19. chemistry

    By applying Le Châtelier’s principle to a reaction that has come to equilibrium, the reaction can be made to A. produce more reactants. B. run to completion. C. reach a new chemical equilibrium. D. All of the above Is the answer D?

    asked by syd on August 10, 2015
  20. Chemistry

    (a) Calculate the standard free-energy change (ΔG°) for the following oxidation-reduction reaction. Cu(s) + Br2(aq) → Cu2+(aq) + 2 Br−(aq) (b) Calculate the equilibrium constant for this reaction at 298 K.

    asked by Anonymous on April 16, 2018
  21. chemistry

    Base your answer on the following redox reaction, which occurs spontaneously in an electrochemical cell. Zn + Cr3+ --> Zn2+ + Cr Write the half-reaction for the reduction that occurs.

    asked by Mike on June 8, 2009
  22. chem

    Pb(aq)2+ + 2e- → Pb(s) Ero = - 0.13 V Sc(aq)3+ + 3e- → Sc(s) Ero = - 2.02 V a) Write a balanced chemical equation for a spontaneous reaction involving these half reactions. b) Explain your rationale for the reaction going in this direction.

    asked by Amy on June 14, 2018
  23. Chemistry

    Consider the following chemical reaction 2HCl+Ca(OH) CaCl+2H2O you have a mixed solution with 20.00mL of 0.100M Ca(OH)2 solution What is the molarity of the HCl,Ca(OH)2 and CaCl2 after the reaction has stopped?

    asked by Ruffles on December 5, 2013
  24. chemistry

    For the reaction Al (s) + 3 HCl (aq) -> AlCl3 (s) + ₃/₂ H2 (g), it was observed that when 4.00 g of aluminum reacted with excess HCl, exactly 30.0 kJ of heat were released. The delta H for this reaction is a) – 91.3 kJ b) – 120 kJ c) – 202 kJ d)

    asked by Walter on January 24, 2012
  25. Chemistry

    Pb(aq)2+ + 2e- → Pb(s) Ero = - 0.13 V Sc(aq)3+ + 3e- → Sc(s) Ero = - 2.02 V a) Write a balanced chemical equation for a spontaneous reaction involving these half reactions. b) Explain your rationale for the reaction going in this direction. I'm not

    asked by Rose on June 14, 2018
  26. chemistry

    For the reaction Al (s) + 3 HCl (aq) -> AlCl3 (s) + ₃/₂ H2 (g), it was observed that when 4.00 g of aluminum reacted with excess HCl, exactly 30.0 kJ of heat were released. The delta H for this reaction is a) – 91.3 kJ b) – 120 kJ c) – 202 kJ d)

    asked by Walter on January 24, 2012
  27. 12th grade

    gaseous ammonia is made by the following reaction: N2+3H2 - 2NH3. if you start with 7 liters on nitrogen gas, how many liters of hydrogen are needed for a chemical reaction?

    asked by Anonymous on June 14, 2010
  28. Chemistry

    In the equation: Fe(NO3)3 (aq) + 3KSCN (aq) forms FeSCN3 (aq) + 3KNO3 (aq) What type of reaction is this? why are there two aqueous solutions as products? Is there a secondary reaction? Finally is there a name for these products?

    asked by ashley on January 4, 2011
  29. Chemistry 143

    Write three thermochemical equation needed to calculate delta H for the following reaction: 2Mg(s) + O2(g) = 2MgO Include delta h values in kJ for each reaction. Please help!! I don't even know were to start!!

    asked by Shana on April 26, 2010
  30. chem class

    The value of Keq for the following reaction is 0.25: SO2 (g) + NO2 (g) SO3 (g) + NO (g) The value of Keq at the same temperature for the reaction below is __________. 2SO2 (g) + 2NO2 (g) 2SO3 (g) + 2NO (g) answer is 0.25 how do i figure this out?

    asked by richy on November 18, 2010
  31. physhic

    For every reaction there is an exact opposite reaction. True! The question one could ask and explore is what came first? or who or what the reaction is. Could we agree good is supieror to evil just to make my point your preference, makes no difference. If

    asked by Kj on February 9, 2016
  32. bioelectricity

    Cl equil-v: Only chloride may cross a membrane separating two compartments. At a temperature of 26∘C, the concentrations of chloride ions are: intracellular: 70 extracellular: 485 What is the equilibrium potential? Give a numeric answer within 1%, in mV.

    asked by B on February 19, 2013
  33. College Chemistry

    Calculate the concentrations of the following solutions, assuming the volumes are exact measurements: a. 18.64g of sodium hydroxide in 350mL of solution b. 8.97mL of 18M hydrochloric acid in 250mL of solution

    asked by Bekah on October 4, 2011
  34. Chemistry

    A 5ml, 10ml, 15 ml, and 20ml Aliquot of 0.010 M sodium salicylate solution was diluted to 100 ml in four different 100ml volumetric flasks with the iron (III)Chloride solution. What are their concentrations.

    asked by Emma on November 13, 2012
  35. Chemistry

    Calculate the concentrations of all species present in a 0.33 M solution of ethylammonium chloride (C2H5NH3Cl). Okay so i tried doing HA = H + A ice table regular it doesnt work idk what Ka to use. b/c of the chloride. i have to find [C2H5NH2][H+][OH

    asked by Spencer on February 16, 2009
  36. College Chemistry

    2NO(g)+O2(g)2NO2(g) has KP = 2.77 × 1011 at 25 °C. Suppose a mixture of the reactants is prepared at 25 °C by transferring 0.943 g of NO and 589 mL of O2 measured at 30.7 °C and 829 torr into a 1 L vessel. When the mixture comes to equilibrium, what

    asked by Peter on March 13, 2013
  37. CHEM

    I am lost. I have to create a buffer using NH4CL and 0.10 M NH3. I have to chose how much of the reagent to use in order to get a concentraion between 0.01 and .5 M. Then after I come up with the recipe for that I have to calculate the pH baces on the

    asked by Erica on April 5, 2016
  38. Chemistry

    Please please help me on this equation I'm stuck and your steps are confusing. Calculate the concentrations of each ion remaining in solution after precipitation is complete. (Enter a 0 if none of the ion remains.) Cl ‾ Ca2+ I have Ag+=0 and NO3^-3= 0.13

    asked by Ashley on June 22, 2013
  39. chemistry

    The correct interpretation of the equation below is:? Fe3+(aq) + SCN¨C(aq)¡ú FeSCN2+(aq) A. The reaction is incomplete because the product is still charged. B. A heterogeneous equilibrium exists because of the charged ions. C. The equilibrium constant

    asked by david on April 11, 2008
  40. Chemistry

    Mg + 2HCI --> MgCl2 + H2 0.158 g of Mg metal is combined with an excess of HCl to make 100.0 ml of solution in a coffee up calorimeter. The reaction rises from 25.60 C to 32.80 C. Determine delta H for the reaction of one mole of Mg. Units in kJ. 3

    asked by Eli on December 4, 2016
  41. chem

    Consider the following unbalanced equation: C2H5OH(g) + O2(g) → CO2(g) + H2O(l) 1.55 g of ethanol reacts with 10.0 g of oxygen. What is the total volume of gas present (in L) after the reaction is complete, assuming the reaction takes place at 1.00 atm

    asked by Bogdanam on December 15, 2010
  42. Inorganic chemistry

    The standard free energy change for a chemical reaction is -18.3kJ/mole. What is the equilibrium constant for the reaction at 87 degrees Celsius? (R=8.314J/K*mol) Delta G = -Rtlnk -18,300/8.314/360 = -6.114

    asked by Steve on May 12, 2009
  43. Chemistry

    Use enthalpies of formation from the textbook to calculate the standard enthalpy of the reaction for the following methane- generating reaction of methanogenic bacteria given delta Hf of CH3NH2=-22.97kJ/mol: 4CH2NH2+2H2O----->3CH4+CO2+4NH3

    asked by Kay on November 6, 2011
  44. Organic chem

    When you react 1-octene wih borane tetrahydrofuran solution and hydrogen peroxided over NaOH and water... (hydroboration- oxidation reaction) how do you run the reaction differently to improve the yield of the major product 1-octanol?

    asked by Sonia on November 4, 2009
  45. Chemistry

    The initial pressure for the compounds involved in the reaction shown were determined to be P(Br2(g)) = 0.5417 atm, P(Cl2(g)) = 0.6962 atm, P(BrCl(g)) = 0.3442 atm. Calculate the value of the equilibrium constant (Kp) at 1000 K if the equilibrium pressure

    asked by Amphee on April 8, 2010
  46. Chemistry

    The initial concentration for the compounds involved in the reaction displayed were determined to be [PCl5(g)] = 0.4107 mol/L, [PCl3(g)] = 0.3463 mol/L, [Cl2(g)] = 0.04085 mol/L. Calculate the value of the equilibrium constant (Kc) at 191.0 °C if the

    asked by marmar on September 30, 2013
  47. Physics

    I have two different questions I can't figure out. 1) Projectile motion: At what initial speed must the basketball player throw the ball at an angle of 55 degrees above the horizontal, to make the foul shot? The horizontal distance from the ball to the

    asked by Pat on July 6, 2010
  48. Biostatstics

    Question: The New York State Health Department reports a 10% rate of the HIV virus for the “at-risk” population. Under certain conditions, a preliminary screening test for the HIV virus is correct 95% of the time. (Subjects are not told that they are

    asked by Lynn on September 18, 2016
  49. Chemistry

    For the reaction C2H4Br2+ 3KI>C2H4+2KBr+KI3, when the rate of reaction is 2.0x10^-5, what is the rate of disappearance of KI?

    asked by Mike on September 17, 2016
  50. science

    explain the progress of the reaction in terms of kinetic energy. explain how various factor affect the rate of reaction. any help thanks

    asked by jake ccord on April 22, 2017
  51. Chemistry

    What property of the following reaction might be qualitatively measured to follow the rate of reaction? A) C(s) + H20(g) > H2(g) + CO(g) B) Cu(s) + 2Ag+(aq) > Cu2+(aq) + 2Ag(s)

    asked by Mia on May 12, 2010
  52. Chemistry

    Define the-half of a reaction. Explain on the molecular level why the half- life of a first-order reaction is constant

    asked by Munavvar on February 28, 2015
  53. chemistry

    At a certain temperature, 514, Kp for the reaction, Cl2(g) + Br2(g) 2 BrCl(g), is 6.98 x 107. Calculate the value of DGo in kJ for the reaction at 514 K.

    asked by sam on April 24, 2011
  54. chemistry

    balance the following equation, and identify the type of reaction. ZnSO4+SrCl2-> i think it's a double replacement reaction. But could someone please help me balance it. I'm not sure how.

    asked by v.c on July 18, 2010
  55. Chemistry

    Define the-half of a reaction. Explain on the molecular level why the half- life of a first-order reaction is constant

    asked by Munavvar on February 28, 2015
  56. chemistry

    Given the following reaction: TiCl4 + O2→ TiO2 + Cl2 If 51.44 g TiCl4 react with 82.32 g O2 complete a mass balance table for this reaction.

    asked by mary on November 17, 2011
  57. chemistery

    explain the progress of the reaction in terms of kinetic energy explain how various factor affect the rate of reaction

    asked by jake on April 22, 2017
  58. Chemistry

    What property of the following reaction might be qualitatively measured to follow the rate of reaction? A) C(s) + H20(g) > H2(g) + CO(g) B) Cu(s) + 2Ag+(aq) > Cu2+(aq) + 2Ag(s)

    asked by Mia on May 12, 2010
  59. science

    If a temperature increase from 19.0 degrees C to 36.0 degrees C triples the rate constant for a reaction, what is the value of the activation barrier for the reaction?

    asked by kristen on March 13, 2011
  60. College Chem.

    How much energy is evolved during the reaction of 48.7 g of Al, according to the reaction below? Assume that there is excess Fe2O3. Fe2O3(s) + 2 Al(s) → Al2O3(s) + 2 Fe(s), ΔH°rxn = -852 kJ

    asked by Brandee on September 1, 2010
  61. Chem: Two questions

    Identify the two types of reactions: 1. A+B--> Answer: Synthesis Reaction 2. A+BC-->AC+B Answer: Single Replacement or Substitution Reaction THANK YOU !

    asked by Cheryl on April 3, 2011
  62. chem

    A certain constant-pressure reaction is nonspontaneous at 37°C. The entropy change for the reaction is 83 J/K. What can you conclude about the sign of ÄH? What can you conclude about the magnitude of ÄH?

    asked by hannah on April 7, 2013
  63. Chemistry

    making 2 moles of No in a reaction requires 180KJ of energy. How much No will be made if this same reaction absorbel 950KJ OF ENERGY

    asked by Janice Madeux on October 7, 2012
  64. AP Chemistry

    Choose a chemical reaction involving two or more reactants. For this reaction, how do you determine which reactant or reactants are limiting? Explain.

    asked by Jessica AP Chemistry on July 5, 2016
  65. College Chem.

    How much energy is evolved during the reaction of 48.7 g of Al, according to the reaction below? Assume that there is excess Fe2O3. Fe2O3(s) + 2 Al(s) → Al2O3(s) + 2 Fe(s), ΔH°rxn = -852 kJ

    asked by Brandee on September 1, 2010
  66. chemistry

    "However, the Ag^+ + I^- reacted to give AgI (but that is not a redox reaction) and if they reacted why didn't Br^- and Ag^+?" Hi Dr.Bob, I am also given additional information for reaction #1 Cu(s) I-(aq) Ag(s) Br- (aq)

    asked by Joseph on April 15, 2008
  67. chemistry

    During a reaction, you see that the heat (q) given off is 3.8 calories. Knowing that you used a mass of 100 g and that the temperature change was 7.85°C, what is the specific heat of this reaction?

    asked by shannon on October 13, 2011
  68. chemistry(Please Check)

    CaCl2(aq)+Na3PO4(aq) -----------> Ca3(PO4)2(s) +NaCl(aq)4) If the “H” for this reaction is -45.5 kJ/mol, is the reaction endo- or exothermic? Exothermic

    asked by Wurola on April 23, 2012
  69. Chemistry

    For a certain reaction, ΔH° = –76.8 kJ and ΔS° = –225 J/K. If n = 3, calculate E° for the reaction at 25°C.

    asked by Tayla on August 1, 2013
  70. Chemistry

    Delta H reaction for the following reaction: C(s)+H2O(g)=>CO(g)+H2(g)

    asked by Chris on October 24, 2011
  71. Chemistry

    Acetylene, C2H2, can be converted to ethane, C2H6, by a process known as hydrogenation. The reaction is: C2H2(g) + 2H2(g) === C2H6(g) Given the following, what is the Kp for the reaction? C2H2(g): 209.2 ΔG˚f (kJ/mol) H2(g): 0 ΔG˚f (kJ/mol) C2H6(g):

    asked by Ezra on March 31, 2013
  72. science(chem)

    For the reaction: acetic acid (2g) + Isopentyl alcohol (0.9g) => Isopently acetate(1.15g)+ H2O I'm suposed to determine the limiting reagent, theoretical yield and percent yield from this reaction but the reaction was given as a picture... I'm not sure

    asked by ~christina~ on October 8, 2007
  73. Physics- i need to know how to do these problems

    Two projectiles are launched from the ground, and both reach the same vertical height. However, projectile B travels twice the horizontal distance as projectile A before hitting the ground. a. How large is the vertical component of the initial velocity of

    asked by anonymous on October 29, 2006
  74. physics

    A quarterback throws the football to a sta- tionary receiver who is 26 m down the field. The football is thrown at an initial angle of 36.5 to the ground. The acceleration of gravity is 9.81 m/s2 . a) At what initial speed must the quarter- back throw the

    asked by destinee on September 20, 2011
  75. Chemistry

    I have this question as a review question: The reaction N2(g)+3H2(g)2NH3(g) begins with 1.15 M N2 and 1.36 M H2. At equilibrium, the concentration of NH3 is 0.78 M. Determine the extent of reaction. The answer is supposed to be 86 but I don't know how

    asked by Sara on June 23, 2015
  76. Chemistry

    Consider the following reaction: CO(g)+2H2(g)⇌CH3OH(g) Kp=2.26×104 at 25 ∘C. Calculate ΔGrxn for the reaction at 25 ∘C under each of the following conditions. A) Standard Conditions B) at equilibrium C)PCH3OH= 1.3atm ; PCO=PH2= 1.2×10−2atm

    asked by Ashley on April 23, 2015
  77. Chemistry

    125.0g each of two solids, lead (II) nitrate and pottassiuk iodide are dissolved in the same beaker. A reaction occurs that produces a precipitate. How many grams of precipitate are produced in the reaction?

    asked by Lowery on March 22, 2016
  78. Chemistry

    In the following reaction, 451.4 g of lead reacts with excess oxygen forming 313.6 g of lead(II) oxide. Calculate the percent yield of the reaction. 2Pb(s)+O2(g)= 2PbO(s)

    asked by Noelle on October 8, 2013
  79. College Chemistry

    Consider the reaction. 4Fe(s) + 3O2(g) ¨ 2Fe2O3(s) If 0.500 mol of Fe reacts with 0.400 mol of O2, what are the limiting reactant and the theoretical yield in moles of Fe2O3 for the reaction, respectively?

    asked by Lisa on March 27, 2012
  80. chemistry

    What is the oxidizing agent in the following reaction? Sn(s) + 2HCl(aq) → SnCl2(aq) + H2(aq) HCl H2 Sn SnCl2 . Question 2 The following is an oxidation-reduction reaction: H2CO3(aq) → CO2(g) + H2O(l) True False

    asked by larlee on October 2, 2017
  81. science

    Using your reaction time, estimate the diestance a car would travel at 20m/s (45 mi/h) before you could apply the brakes. To get the deistance in meters you multiply the speed in m/s by your reaction time in seconds

    asked by Karen on February 3, 2015
  82. Chemistry

    Consider the following reaction: CaCO3(s)→CaO(s)+CO2(g). Estimate ΔG∘ for this reaction at each of the following temperatures. (Assume that ΔH∘ and ΔS∘ do not change too much within the given temperature range.) A) 310K B) 1070K C) 1470K And is

    asked by Greg on May 15, 2014
  83. Grade 9th

    If 6.5g of zinc reacts with 5.0g of HCL,according to the reaction.Zn + 2HCL:zncl2+h2 Which substance is the limiting reaction? How many grams of the reactant remains unreactant? How many grams of hydrogen would be produce?

    asked by Ettefa Tirfessa on December 22, 2014
  84. chemistry

    Consider the equilibrium reaction CO(g)+H2O(g)⇋CO2(g)+H2(g) Determine how each change in the left-hand column will stress the system and in which direction the equilibrium reaction will shift in response.

    asked by Jean on April 18, 2016
  85. Chemistry

    a chemist carries out the reaction of 0.250 mol of f2 with excess of cl2. At 250 degress C and 1.00 atm, what is the maximum volume of CLF3 in liters that the reaction can produce?

    asked by Emilee on March 27, 2013
  86. science

    For the following reaction if the reaction temperature was increased would the equilibrium shift to the right or the left,not shift at all,or you cant answer the question because Keq is not given? 2SO3(g)2SO2(g)+O2(g)..(deltaH degrees =198kj) Why???

    asked by Andy on May 10, 2010
  87. chemistry

    For a particular chemical reaction, the rate constant at 30.0 °C is 1.38 X 10-4 L mol-1 s-1, while the value at 49.0 °C is 1.21 X 10-3 L mol-1 s-1 . What is the activation energy for this reaction? a. 92.8 kJ b. 200 kJ c. 40.4 kJ d. 343 kJ e. 56.4 kJ ln

    asked by bob on February 25, 2012
  88. Chemistry

    Problem: In a first order decomposition reaction, 50% of a compound decomposes in 10.5 minutes. What is the rate constant of the reaction? The solution my professor gave says: k = .693 / 10.5min Where did the .693 come from? Thanks

    asked by Help on March 15, 2010
  89. Chemistry

    Consider the reaction 2 SO2 + O2 in equilibrium with 2 SO3 . At 25°C Ho = -197.78 kJ and So = -187.95 J/K. Using this information, calculate the equilibrium constant for the reaction at 50°C. (R = 8.314 J/K) Enter your answer using TWO significant

    asked by Laura on April 7, 2011
  90. Chemistry URGENT!

    If the reaction of 0.500 grams of aluminum metal with excess aqueous HCl releases 9.72 kJ of heat, what is the ΔH value for the reaction? 2 Al(s) + 6 HCl(aq) → 2 AlCl3(aq) + 3 H2(g) All I have is: .500gAl*(1 mol Al/26.98gAl) Please and thank you so

    asked by Jim on September 11, 2015
  91. chemistry

    The correct interpretation of the equation below is: Fe3+(aq) + SCN–(aq) --> FeSCN2+(aq) A. At equilibrium, the rate of the forward reaction equals the rate of the reverse reaction. B. The equilibrium constant is Kc = [Fe3+][SCN–][FeSCN2+] C. A

    asked by Jerome on April 10, 2008
  92. chemistry

    The correct interpretation of the equation below is: Fe3+(aq) + SCN–(aq) --> and

    asked by Lindsey on April 9, 2008
  93. Calculus1

    A car braked with constant deceleration of 16 ft/sec^2 takes 200 ft to come to a complete stop. How fast was the car traveling when the breaks were first applied? A) if the brakes were first applied when t = 0 at position s(0) = 0, the initial velocity is

    asked by ACDub on April 10, 2014
  94. Chemistry

    Name four factors that can affect the rate of a chemical reaction. How does the rate of a chemical reaction change in response to a change in each factor? My answer: Four factors that can affect the rate of a chemical reaction are concentration, surface

    asked by Anonymous on October 11, 2010
  95. Equilibrium concentrations, please help!!!

    Lead metal is added to 0.150 M Cr3+(aq). Pb(s)+2Cr3+(aq)⇌Pb2+(aq)+2Cr2+(aq). KC=3.2×10−10 What is [Pb2+] when equilibrium is established in the reaction? What is [Cr2+] when equilibrium is established in the reaction? What is [Cr3+] when equilibrium

    asked by Sara on February 18, 2017
  96. science, chemistry

    Lead metal is added to 0.150 M Cr3+(aq). Pb(s)+2Cr3+(aq)⇌Pb2+(aq)+2Cr2+(aq). KC=3.2×10−10 What is [Pb2+] when equilibrium is established in the reaction? What is [Cr2+] when equilibrium is established in the reaction? What is [Cr3+] when equilibrium

    asked by Sara on February 18, 2017
  97. Inorganic chemistry

    A 20.0 mL sample of 0.20 M sodium acetate is titrated with 0.11 M HCl)aq). What is pH after the addition of50.0 mL HCl(aq)? Kbof CH3CO2^- = 5.6x10^-10) So far I have the Initial amount of sodium acetate (0.02)(0.20) = .004 mol Amount of HCl added

    asked by Steve on April 14, 2009
  98. Chem

    I really appreciate the help you gave me earlier. I was wondering if you could please look over these questions for me to? The answers will always be either reactant, product or neither. 1)P4(s)+6 Cl2(g)4 PCl3(l) Which side of the reaction will be favoured

    asked by TINA on January 30, 2012
  99. politics

    What was the White House reaction to Lesley Stahl’s critical report on Reagan’s use of television? A. CBS News was excluded from White House press conferences. B. Stahl was honored at a White House ceremony. C. The reaction was very positive, because

    asked by bev on May 29, 2017
  100. Chemistry (equilibrium)

    In the following equilibrium system, N2O4(g) NO2(g), what happens to the color of the gas if the forward reaction speeds up? What happens if the reverse reaction speeds up? What happens if the forward and reverse reaction happen at the same time? NO2 is a

    asked by abby on April 1, 2007