a certain reaction has the following generaln form

74,866 results, page 66

  1. Chemistry

    Consider the following data: * NH3(g) yields 1/2 N2(g) + 3/2 H2(g) delta H = 46kJ * 2 H2(g) + O2(g) yields 2 H2o(g) delta H = -484 kJ Calculate delta H for the reaction: 2 N2(g) + 6 H2O (g) yields 3 O2(g) + 4 NH3(g)
  2. Chemistry

    For the reaction, 2 XO + O2 = 2 X02, some data obtained from measurement of the initial rate of reaction at varying concentrations are given below. run # [XO] [O2] rate, mol L-ls-l 1 0.010 0.010 2.5 2 0.010 0.020 5.0 3 0.030 0.020 45.0 The rate law is therefore a. rate = k[XO]...
  3. AP Chemistry

    i'm having trouble balancing the redox reaction for the iodine clock lab. The redox reaction inovlves a hydrogen sulfite ion and iodate ion in an acidified solution. i have the final balanced equation, 5 HSO3 + 2 IO3 ---> I2 + 5SO4 + H20 + 3H but i'm having trouble figuring...
  4. sosial studies

    When 1.0 L solution Ba (NO3) 2 2.0 M at 25oC is mixed with 1.0 L solution of 2.0 M Na2SO4 in a calorimeter, the reaction that occurs to produce solid barium sulfate and temperature of the mixture increased to 28.1 oC. Calculate the enthalpy change per mole for the reaction ...
  5. physics

    Through beta decay, 55Cr (Chromium‑55 –with mass 54.94080 u) emits an electron (0.00055 u) leaving a daughter nucleus of 55Mn (manganese‑55 with mass 54.93800 u). a) How many different particles to we get out of this reaction b) How much energy in MeV is released...
  6. Chemistry

    Strontium metal is responsible for the red color in fireworks. Fireworks manufacturers use strontium carbonate, which can be produced by combining strontium metal, graphite (C), and oxygen gas. The formation of one mole of SrCO3 releases 1.220 x 103 kJ of energy. a) Write a ...
  7. statistics

    The professor teaching a large introductory class gives a final exam that has alternate forms, A, B, and C. A student taking the exam using Form B is upset because she claims that Form B is much harder than Forms A and C. Discuss how percentile point data might be useful to ...
  8. PHI103

    Sorry, I didn't post my argument the last time. Write two arguments in English, one in the form of modus ponens and one in the form of modus tollens. Then, write the arguments in symbols using sentence letters and truth-functional connectives. The following is one of the ...
  9. MATH - immediate help needed!

    Please provide the solution to the below problems: In a certain state lottery, a player selects four different numbers from 1 through 30. Find the probability that a single choice of four numbers wins the lottery, assuming the order of the numbers is not important...
  10. Chemistry

    For the reaction, 2 XO + O2 = 2 X02, some data obtained from measurement of the initial rate of reaction at varying concentrations are given below. run # [XO] [O2] rate, mol L-ls-l 1 0.010 0.010 2.5 2 0.010 0.020 5.0 3 0.030 0.020 45.0 The rate law is therefore a. rate = k[XO]...
  11. Chemistry

    b)Rubidium Express your answer in condensed form, in order of increasing orbital energy. c)Tellurium Express your answer in condensed form, in order of increasing orbital energy. d)Palladium Express your answer in condensed form, in order of increasing orbital energy. e)...
  12. chemistry

    calculate the lattice energy of sodium oxide (Na2O) from the following data: Ionization energy of Na(g): 495 kJ/mol Electron affinity of O2 for 2e: 603 kJ/mol Energy to vaporize Na(s): 109 kJ/mol O2(g) bond energy: 499 kJ/mol Energy change for the reaction 2Na(s)+ 1/2 O2(g)--&...
  13. chemistry

    How to calculate enthalpy change of the following reaction? : S + 2h2o >>> so2 + 2h2 given: s+o2 >>> so2 - enthalpy change = -296.8 kJ h2 + 1/2o2 >> h20 enthalpy change= -285.8kj I was trying to solve it myself but i got confused.. i know i have to ...
  14. Chemistry

    Calculate the molar heat of neutralization in kj/mol of the reaction between HA and BOH given the following information: The temperature change equals 9C 50mL of 1M concentration of Acid 50ml of 1M concentration of Base Heat Capacity of the calorimeter is 6.5 J/C. Specific ...
  15. chem

    how do you tell which reactant is limiting reactant with the following information: mass of cup 55.78g mass o/sodium bicarbonate 1.01g mass o/citric acid 1.52g toal mass 58.31g mass of cup,solute after reaction 59.95g mass o/carbon dioxide .42g H3C6H5O7(aq) + 3 NaHCO3(aq...
  16. Chemistry- HW Check

    I have seven homework problems. I did them but I wasn't sure if I did them correctly. Did I do them correct? Thank you! Give the reaction that describes how the hydrazine, N2H4(aq), / hydrazinium ion, N2H51+(aq), buffer reacts with a strong base such as sodium hydroxide. N2H4(...
  17. Math Help!

    A.) Determine "a" and "k" so both points are on the graph of the function. 1.) (0,1) (2,1); y=a(x-1)^2+k 2.) (1,11) (2,-19); y=a(x+1)^2+k B.) Determine whether or not the function f(x)=0.25(2x-15)^2+15 has a mazimum or a minimum value. Then find the value. C.) When y=2(x-3)(x+...
  18. Physics

    A metal of block of mass 10kg lies on a rough plane, horizontal force of 8n applied to the block through it's centre of mass just slides the block on the plat form. What is the coefficient of limiting friction between the block and the plat form.
  19. language arts

    please check my answers: 1.which of the following sentences correctly demonstrates the verb form of the adverb ruefully? (A)she had a rueful look on her face (B)i rue the loss of a golden opportunity (C)he is totally rueless to the truth 2.a person described as sensitive can ...
  20. calculus

    A rancher has 1000 feet of fencing with which to enclose two adjacent rectangular corrals with a interior partition (consider as one pen). Use calculus to determine what the external dimensions of the pen that will maximize the enclosed area. Write your answer in the form ...
  21. chemistry

    Aspirin, C 9 H 8 O 4 , slowly decomposes at room temperature by reacting with water in the atmosphere to produce acetic acid, HC 2 H 3 O 2 , and 2-hydro x ybenzoic acid, C 7 H 6 O 3 (this is why old bottles of aspirinoften smell like vinegar):C 9 H 8 O 4 + H 2 O p HC 2 H 3 O 2...
  22. physics

    you drag a heavy box along a rough horizontal floor by a horizontal rope. Identify the reaction force to each of the following forces: (a) the pull of the rope on a box (b) friction force oin the box (c) the normal force on the box (d) weight of the box
  23. physics

    you drag a heavy box along a rough horizontal floor by a horizontal rope. Identify the reaction force to each of the following forces: (a) the pull of the rope on a box (b) friction force oin the box (c) the normal force on the box (d) weight of the box
  24. chemistry

    Choose the correct integrated rate law for each reaction order.? Choose the correct integrated rate law for each reaction order. Reaction Order Answer zero ____ first _____ second _____ a. l/[A]t = kt + l[A]0 b. log[A]t = kt +log[A]0 c. ln[A]t = –kt + ln[A]0 d. [A]t = –kt...
  25. Math

    Which of the following is a certain event? A. Rolling a composite number on a number cube B. Rolling a number greater than 1 on a number cube C. Rolling an odd or even number on a number cube D. Rolling a number greater then 7
  26. Chemistry

    The acid-base reaction between phosphoric acid, H3PO4, and calcium hydroxide, Ca(OH)2, yields water and calcium phosphate. For each mole of calcium phosphate produced by this reaction, how many moles of water are also produced?
  27. apchemistry

    The numerical value of the concentration equilibrium constant for the gaseous reaction 2 SO2 + O2 *) 2 SO3 is 0.5 at temperature T. When a reactionmix- ture is brought to equilibrium, [O2] is found to be 2.0 M and [SO3] is found to be 10 M. What is the equilibrium ...
  28. chem

    Consider the reaction: CO(g)+Cl2(g)⇌COCl2(g) Keq= 2.9×1010 at 25 ∘C A 5.89 −L flask containing an equilibrium reaction mixture has [CO]= 1.9×10−6 M and [Cl2]= 9.3×10−7 M . How much COCl2 in grams is in the equilibrium mixture?
  29. chemistry

    for the reaction: 4NH3+5O2=4NO+6H2O; 15.0g of NH3 and 27.5g of O2 were reacted. a). which is the limiting reactant? b).how many moles of NO are formed from the limiting reactant in the above reaction. i know how to do the moles but i couldn't figure out which one is the ...
  30. please check(Social studies)

    1.A---->B 2.D---->A 1.Which of he following is the greatest threat to the island's resources? (central american and the caribbean) i included that because i think that is the islands. A.biodiversity B.hurricanes C.deforestation D.ecotourism 2.What causes hurricanes to ...
  31. Chemisrty

    Chlorine gas can be produced in the laboratory by adding concentrated hydrochloric acid to manganese(IV) oxide in the following reaction.. MnO2(s)+ 4HCl(aq)-->MnCl2(aq)+ 2H2O(l)+ Cl2(g) A. Calculate the mass of MnO2 needed to produce 25.0g of Cl2 B. What mass of MnCl2 is ...
  32. chemistry

    balance:H2(g)+S2(g)------->H2S(G)+heat A.) how would the equilibrium be affected give the following: - increase in temperature - increase in hydrogen concentration - increase in reaction container of volume B.) is equilibrium homogeneus or heterogeneus? C.) what is ...
  33. math

    How do I put an equation into standard form, Ax+Bx=C? I have the given points (-1,3) and (2,-4). Also, how do you write an equation in standard form when perpendicular through another? [the question is "through (-1,2) and perpendicular to 2x-3y=-5]
  34. Radicals

    How do you graph y>= sqrt(3x+12) Show how to get certain points.
  35. science

    Why do certain comets return at regular intervals?
  36. physics

    A certain radio wave has a frequency of 2.0 * 10^6 Hz. what is its wavelength?
  37. science

    explain why certain bugs can walk on water
  38. science

    explain why certain bugs can walk on water
  39. Algebra 2

    help with a question x+2/x-4 + x^2 + 6 I am not certain how to solve this problem at all
  40. Math

    How do you calculate how many images there will be in a certain number of iterations?
  41. algebra

    If dx=-18 and D=3 are the values of certain simultaneous equation in x and y. What is the value of y
  42. maths --plse help me..

    On a certain sum, C.I. is Rs 41 and SI is Rs 40. for 2 years. What is the rate p.a.
  43. maths --plse help me..

    On a certain sum, C.I. is Rs 41 and SI is Rs 40. for 2 years. What is the rate p.a.
  44. maths --plse help me..

    On a certain sum, C.I. is Rs 41 and SI is Rs 40. for 2 years. What is the rate p.a
  45. algebra

    seven more than twice a certain number?
  46. (1-22)Chemistry - Science

    Consider the following reaction: C(s) + H2O (g) ⇌ CO (g) + H2 (g) (Kp = 0.45 at 900 K) What is the equilibrium partial pressure of H2O when the initial partial pressure of water is 1.00 atm? a) 0.43 atm b) 0.58 atm c) 0.22 atm d) 0.52 atm e) 1.16 atm
  47. chemistry

    A reaction is run in which dissolved silver ions are reduced in the presence of solid copper. THis reaction can be used to produce a silver coating on a copper wire frame. .249g of copper wire was placed in a 100 mL of a 0.500 M solution of silver nitrate. What is the maximum ...
  48. How to Plug these values into the Arrhenius Formul

    A reaction has a rate constant of 1.23×10-4 s at 28 degrees C and 0.235 s at 79 degrees C. A: Determine the activation barrier for the reaction. B: What is the value of the rate constant at 15 degrees C? ------------- I know that I need to use the Arrhenius formula. However, ...
  49. statistics

    Each of the following is a confidence interval for u = true average(population mean) resonance frequency (Hz) for all tennis rackets of a certain type: (114.4, 115.6) (114.1, 115.9) A) What is the value of the sample mean resonance frequency? B) Both intervals were calculated ...
  50. statistics

    Each of the following is a confidence interval for u = true average(population mean) resonance frequency (Hz) for all tennis rackets of a certain type: (114.4, 115.6) (114.1, 115.9) A) What is the value of the sample mean resonance frequency? B) Both intervals were calculated ...
  51. Business statistics

    2. Each of the following is a large-sample confidence interval for μ, the mean resonance frequency (HZ) for all tennis rackets of a certain type. (114.4, 115.6), (114.1, 115.9) a. What is the value of the sample mean resonance frequency? b. Both intervals were calculated ...
  52. Biology

    Which of the following is not a terminal electron acceptor in anaerobic respirations? a)nitrite b)carbon dioxide c)hydrogen sulfide d)sulfate e)nitrate Question 2 Which of the following is not an end product of fermentation? a)pyruvate b)none of the answers are correct c)...
  53. chemistry

    Calculation of )Hf0 for Mg2+(aq.) 1. Assume the heat capacity of the final solution is 3.92 J K-1 g-1. Using the mass of the HCl solution, calculate qcontents from equation (4.6). Calculate qsystem from equation (4.5). 2. Calculate the moles of Mg2+ produced, nrxn. Be sure to ...
  54. Chem(Check Please)

    Will someone please check my answers for me? I put arrows(<----) to indicate my answer. Thank you in advance. 1.A student increases the temperature of a 556 cm³ balloon from 278 K to 308 K. Assuming constant pressure, what should the new volume of the balloon be? 320 cm3 ...
  55. chemistry

    QUESTION: Calculate the standard free-energy change (deltaG°) for the following reaction at 25 °C in kJ. 2Ag^3+(aq) + 3Zn(s)<==> 2Au(s) + 3Zn^2+(aq) here's what i have so far: first i wrote out the half reactions: Au^3+(aq) + 3e^- --> Au(s) = +1.52*2 Zn(s) --> Zn...
  56. Chemistry

    Quick question: How can I be sure that a slow reaction is not running out of reagents? Thanks The question is too general for a quick answer. Depending upon the reaction, intensity of color (either decreasing or increasing) might be one way, the odor of a product or one of the...
  57. chemistry

    Carbon reacts with chlorine and hydrogen to form the compound CH3Cl. (a) Construct the structure of CH3Cl. What is the dominant form of secondary bonding for CH3Cl? Dipole-dipole interactions, London dispersion forces, Covalent bonding, Ionic bonding
  58. 5th grade math

    My daughter must correct the problems that she has gotten wrong in math, and we are trying to help her. I can not remeber how to write decimals in exponential form, and I tried looking in her book. Can some one help me so that I can help my daughter. Thanks Here is the problem...
  59. Chemistry. What equation do I use?

    A 20.29 g sample of impure MgCO3 is completely decomposed at 1000oC in previously evacuated 2.0 L reaction vessel. After the reaction was complete the solid residue had a mass of 15.9 g. Assume that only MgCO3 could produce gas CO2 what percent of original sample was magnesium...
  60. Chemistry

    20.2 mL of 0.234 M FeCl3 is added to 42.5 mL of 0.453 M NaOH. Iron(III) hydroxide precipitates. NaCl remains in aqueous solution. 1) What mass (in g) of Fe(OH)3 should precipitate (assuming 100% yield)? 2) How many moles of the excess reactant remain after the reaction is ...
  61. physics

    A meterstick is held vertically above your hand, with the lower end between your thumb and first finger. On seeing the meter stick released, you grab it with those two fingers. You can calculate your reaction time from the distance the meterstick falls, read directly from the ...
  62. Chemistry

    I don't quite understand these questions.. Please help, thank you! 1. What happens Qualitatively on both the Macroscopic and Atomic Levels when Zinc, Iodine and Water are mixed? Does a Reaction occur? 2. If a Reaction does take place, are the Physical and Chemical Properties ...
  63. Chemistry

    If the initial concentration of NH3(g) is 4.643 mol/L, calculate the % of NH3(g) left over after the reaction reaches equilibrium according to the balanced equation. The value of Kc at 773.0 K is 16.70. The initial concentration of the reaction products is 0 mol/L. 2NH3(g) = ...
  64. Chemistry

    A calorimeter contains 22.0 mL of water at 14.0 C. When 2.50 g of X (a substance with a molar mass of 66.0 g/mol) is added, it dissolves via the reaction X(s)+H_2O(l)--------> X(aq) and the temperature of the solution increases to 25.5 C. Calculate the enthalpy change, ...
  65. english

    The paragraph below needs to be made more coherent. Use repetition, synonyms, and pronouns to link the sentences. Type the improved paragraph in the space provided on the following page. Many cities are easily distinguished by their skylines. In such cities--New York and Paris...
  66. chemistry

    testing bronsted lowry reaction predictions...... im super stuck can someone help me steo by step how to figure this out assuming i use the 5 step process? write a balanced chemical equation for ch3coona and hcl reaction position of equilibrium. I know that ch3coo is a SB and ...
  67. CHM1045

    NH4NO3(s) right arrow NH4+(aq) + NO3−(aq) In order to measure the enthalpy change for this reaction, 1.21 g of NH4NO3 is dissolved in enough water to make 25.0 mL of solution. The initial temperature is 25.8°C and the final temperature (after the solid dissolves) is 22....
  68. Math

    My answers 1.A 2.C 3.D 4.A 5.A 6.D 7.B 8.D 9.D 10.C 1. Write the following ratio in simplest form: 32 min:36 min (1 point) 8:98:3632:9128:144 2. Marie saved $51. On Wednesday, she spent $8 of her savings. What ratio represents the portion of her total savings that she still ...
  69. Algebra

    Express the following in simplest radical form. All variables represent positive real numbers. square root of 80a^2b divided by the square root of7a^3b^7 I got an answer of 4 square root of 5 divided by b^3 square root of 7a
  70. Science

    As early as 1938, the use of NaOH was suggested as a means of removing CO2 from the cabin of a spacecraft according to the following reaction : NaOH+CO2 -> Na2CO3 + H2O. If the average human body discharges 925. 0 g of CO2 per day how many moles of NaOH are needed each day ...
  71. Language arts 2 question!??

    Hey... one question from the story "Thank You, Ma'am."???: 2. In "Thank You, Ma'am," repeating certain words and phrases helps the author (1 point) complete the evidence review unknown skills establish the story's tone become a better writer Here's the other one, its got me ...
  72. math

    Find the place value of 7 and 8 in the number 9.7548. (b). Write 23459/1000 in decimal form. (c). Write 3.537 in English words. (d). Write twelve and seventeen thousandths in decimal form. (e). Complete the statements below, using the symbol “<” or “>”. 0.889 ...
  73. Last questions Ms. Sue please for math

    1. To which subset(s) does the number √42 belong? Rational numbers Irrational numbers Whole numbers, integers, rational numbers While numbers, natural numbers, integers 2. Evaluate the following expression for the values given. P/s + r^2q ( p = 60, q = 6, r = 5, s = 4) ...
  74. Chemistry

    So I do know how to work out letter a) but I'm still very confused with parts b and c. Appreciate the help! 2FeN(s) + 3H2(g) --> 2Fe(s) + 2NH3(g) Suppose that the reaction is carried out at 300C and 3.00 atm. 1.00 grams of iron (III) nitride reacts. a)What is the volume of ...
  75. chemistry

    Calculate the value of ΔHo for the reaction 2 CH4 (g) -> C2H6 (g) + H2 (g) given the following thermochemical equations: C2H2 (g) + H2 (g) -> C2H4 (g) ΔHo = – 175.1 kJ C2H6 (g) -> C2H4 (g) + H2 (g) ΔHo = + 136.4 kJ C2H2 (g) + 3 H2 (g) -> 2 CH4 (g...
  76. Chemistry

    In accordance with Hessfs Law, manipulate the following equations and their ƒ¢Hrxnfs to calculate ƒ¢Hrxn for the reaction HClO4 + NH3 ¨ NH4ClO4... HClO4(aq)+ LiOH(aq) ¨ LiClO4(aq)+H2O(l) CH3COOH(aq)+ NH3(aq) ¨ NH4CH3COO(aq) CH3COOH(aq)+LiOH(aq)¨ LiCH3COO(aq...
  77. chemistry help

    An amount of 414.27 g of zinc sulfide (ZnS, MM=97.44 g/mol) reacts with 99.58 g of oxygen gas (O2, MM=31.999 g/mol) at a constant temperature of 298.0 K and constant pressure of 1.00 atm. The reaction: 2 ZnS(s) + 3 O2(g) --> 2 ZnO(s) + 2 SO2(g) dH = -818.58 kJ a) How much ...
  78. chemistry help

    An amount of 414.27 g of zinc sulfide (ZnS, MM=97.44 g/mol) reacts with 99.58 g of oxygen gas (O2, MM=31.999 g/mol) at a constant temperature of 298.0 K and constant pressure of 1.00 atm. The reaction: 2 ZnS(s) + 3 O2(g) --> 2 ZnO(s) + 2 SO2(g) dH = -818.58 kJ a) How much ...
  79. Chemistry

    The reaction described takes place in solution in a coffe-cup style calorimeter. We will assume that the cups absorb or release a negligible amount of heat so we will not need to worry about the calorimeter constant or qcal. If the total mass of the solution in the calorimeter...
  80. algebra

    Help Fast PLEASE!! check for corrections on my problems 1.Rewrte the following in simplified radical form, Assume all variables represents positive real numbers: square root 48y^10= 4y^5 square root 3 2.Rationalize the denomintor and simplify: square root33/square root 21= ...
  81. Chemistry - please help

    An anyhdrous metal chloride, X, contains 37.4% Cl. X is a reducing agent, 0.895 g requiring 23.60 cm^3 of 0.100M KIO3 for complete oxidation in 3- 9M HCl. X reacts with potassium chloride to form an adduct Y, containing 14.8% K. Identify X and Y, and comment briefly on their ...
  82. Chemistry

    a middle-aged man has been diagnosed as being at high risk group of developing Coronary Artery Disease. Distinguish between the good and bad forms of this sterol. 'Explain the function of the good form of this sterol in the body. List the food groups that are the sources of ...
  83. Parabolas in standard form!

    Hello, I am having the worst time trying to solve these parabolas and putting them into x-h = a(y-k)^2 form. :( There are two problems that i keep doing something wrong. could someone solve them so I can have a set up for the rest of my problems? :) 3y^2+6y+108x-969=0 and x^2+...
  84. Chemistry

    Given the following information determine the reaction Gibbs energy for the formation of silicon dioxide at 298 K Si(s)+O2(g) →SiO2(s) ΔfH°(Si(s))=0 kJ mol-1, S°(Si(s))=18.8 J mol-1 K-1 ΔfH°(O2(g))=0 kJ mol-1, S°(O2(g))=205.0 J mol-1 K-1 ΔfH°(SiO2­(s))=-910.7 kJ mol...
  85. health

    assess an infant,Discuss at least two social factors that are impacting the health of your client. Be certain to specifically state how those factors positively or negatively affect your client’s health. Discuss at least two cultural factors that are impacting the health of ...
  86. chem

    Complete and balance each of the following equations. If no reaction occurs, please enter NR in each answer box. (Type your answer using the format CO2 for CO2. Do not leave any box blank. Use the lowest possible coefficients.) ____Al4C3(s) + ___H2O ___Al(OH)3 + ___ _____ ...
  87. physics-please check

    is this right?: when a form of energy changes from one form to another some energy may transfrm into a useful form, those useful form of energy is high grade energy.while the rest of the energy will always change to form we cannot use.which is called the low grade energy. if i...
  88. BLD 414

    A liquid solution of formaldehyde is 37.0% pure. This solution has a specific gravity of 1.037. The molecular weight of formaldehyde is 30.0. to 1.00 ml of this impure stock solution is added quantity sufficient to take the total volume to 500ml. If 1.00 ml of this solution is...
  89. Chemistry

    The net reaction for fusion on a star like our Sun is: 4H(1,1) ==> He(4,2) + 2e(0,+1) Calculate the mass defect for this reaction. If one atom of He is formed this way, calculate the energy released. If one Kg of He is formed, calculate the energy released. The masses of ...
  90. Chemistry

    The Haber process is used to synthesize ammonia (NH3) from N2 and H2. The change in standard Gibbs free energy is ΔG°rxn = -16 kJ/mol A. Calculate the equilibrium constant for this reaction B. Calculate the ΔGrxn when you have 2 atm of NH3 (g), 2 atm of H2 (g), and ...
  91. Science

    Which of the following occurs during artificial selection but not natural selection? a. Selection pressures result in only certain traits from a population being passed on to offspring. b. Traits are passed to offspring through genes. c. Males and females mate and produce ...
  92. CHEM HELPP!

    Chlorine gas can be produced in the laboratory by adding concentrated hydrochloric acid to manganese(IV) oxide in the following reaction.. MnO2(s)+ 4HCl(aq)-->MnCl2(aq)+ 2H2O(l)+ Cl2(g) A. Calculate the mass of MnO2 needed to produce 25.0g of Cl2 B. What mass of MnCl2 is ...
  93. history

    Which of the following best describes how many Europeans, living through the Great Depression, thought about political systems? a) All forms of governments are bad b) Liberalism is the best form of government c) Liberalism was in decline and authoritarianism was on the rise d...
  94. chemistry

    1) C2H2O4(aq) = H+ (aq) + C2HO4- (aq); Keq = 6.5E-2 2) C2O42- (aq) + H+ (aq) = C2HO4- (aq); Keq = 1.64E+4 then what is the equilibrium constant for the following reaction: C2H2O4(aq) = 2H+ (aq) + C2O42- (aq)? Keq = 1070 Keq = 227 Keq = 2.21E-4 Keq = 3.96E-6 Keq = 6.30E-3
  95. Louisiana State History

    1. what data tell you how much the price of goods inflates over a period of time? A. consumer price index B. gross domestic product C. unemployment rate D. economic indicator 2. what does the gross domestic product measure? A. the value of the U.S. and foreign goods during a ...
  96. chemistry

    Bornite (Cu3FeS3) is a copper ore used in the production of copper. When heated, the following reaction occurs. 2 Cu3FeS3(s) + 7 O2(g) 6 Cu(s) + 2 FeO(s) + 6 SO2(g) If 3.88 metric tons of bornite is reacted with excess O2 and the process has an 75.6% yield of copper, what mass...
  97. chemistry

    how to calculate delta h for the reaction 2B(s)+3H2(g)arrow B2H6(g)given the following data: 2B(s)+3/2O2(g)arrowB2O3(s) deltaH=-1273kj B2H6(g)+3O2(g)arrowB2O3(s)+3H2O(g) deltaH=-2035kj H2(g)+1/2O2(g)arrowH2O(l) deltaH=-286kj H2O(l)arrowH2O(g) deltaH=+44kj
  98. CHEM

    Hydrogen peroxide (H2O2) is decomposed according to the following reaction: 2H2O2 (l) ¡÷ 2H2O (l) + O2 (g) If 6.00 g of aquesous solution containing hydrogen peroxide was decomposed after heating, the mass of oxygen gas collected is 2.40 g, what is the mass percentage of ...
  99. chemistry

    What will happen in this reaction: NH3 + H2 = NH4 when x amount of NH4 is added, equilibrium is reached, then 2x is removed. to the product side because the amount taken out is greater than amount that is added? if amount added is x and amount removed is also x, then would the...
  100. Chemistry

    Benzoic acid and quinine are dissolved in a solution of dichloromethane. (benzoic acid pKa = 4.2; quinine pKa = 8.5) a) Besides the normal neutral forms for benzoic acid and quinine, will there be any other chemical form(s) present in the dichloromethane solution? a) What ...
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