CHEMISTRY (WEBWORK)

59,293 results, page 86

  1. chemistry

    how do I calculate what temperature is needed to heat 52 grams of ethane to occupy 1200ml?
  2. Chemistry

    How much heat is given off by melting 155 grams of water?
  3. chemistry

    The following reaction consumes 2.40 kg of CO, How many total liters of gas are formed at STP?
  4. chemistry

    25.5g C7H11NO7S (4-nitro-2-toluenesulfonoic acid dihydrate) in 1.00*10^2g H2O (nonionizing solute)
  5. organic chemistry

    Propose a mechanism for the acid catalyzed dehydration of 1,1-dimethyl propanal
  6. organic chemistry

    what product would you expect to obtain from addition of Cl2 to 1,2-dimethylcyclohexene?
  7. Chemistry 122

    What is the pH of a solution obtained by dissolving 0.325 g of acetylsalicylic acid, in 0.5 L of water? With a Ka of 3.3 x 10 ^-4.
  8. chemistry

    Calculate the molar solubility of MX2, if the Ksp=3.3x10^-8 how can i solve this problem?
  9. chemistry

    Calculate the molar solubility of MX2, if the Ksp=3.3x10^-8 how can i solve this problem?
  10. Chemistry

    I posted a question at 5:43pm yesterday...can anyone please help with at least some of it? Thank you so much.
  11. chemistry

    3.49g of ammonia at STP weighs 4.48litre calculate molecular mass of it.
  12. chemistry

    How does electron configuration of ions derived from representative elements give them stability?
  13. Chemistry

    Which of the following electron configurations is not consistent with Hund's rule? 1) 1s^2 2s^2 2p^2 3s^1 2) 1s^2 2s^2 2p^6 3s^2 3p^5 3) 1s^2 2s^2 2p^6 3s^3 3p^6 4) 1s^2 2s^2 2px^2 2py^1
  14. Chemistry

    A solution that has an osmotic pressure greater than that of red blood cells is called?
  15. Chemistry

    Which of the following electron configurations is not consistent with Hund's rule? 1) 1s^2 2s^2 2p^2 3s^1 2) 1s^2 2s^2 2p^6 3s^2 3p^5 3) 1s^2 2s^2 2p^6 3s^3 3p^6 4) 1s^2 2s^2 2px^2 2py^1
  16. chemistry

    Your task is to produce 175mL of carbon dioxide. You many use anything in class.
  17. Chemistry

    Calculate the concentration of the solution in mass percent: 32.3 mg KNO3 in 2.44g of H2O.
  18. Chemistry

    In the determination of melting points, why cant you use water instead of mineral oil?
  19. Chemistry

    the bond between which pair of elements is the least ionic in character ? (1) H-F (2)H-Cl (3) H-I (4) H-O please help
  20. chemistry

    what is the molarity of an unknown HCI concentration if it requires 75ml of a 0.2 M NaOH solution?
  21. Chemistry

    Explain why CH2ClBr and CH2Cl2 do not have optical, geometric, or structural isomers?
  22. chemistry

    how do i do this: give the number of protons, electrons, and neutrons in each of the following atoms. 108 47 Au 40 20 Ca 23 11 Na
  23. chemistry

    If you have a 29.6 mass percent KCl in benzene,what is the new boiling point?
  24. Chemistry

    Calculate the enthalpy change per gram for the combustion of ethane (C2H6(g)).
  25. chemistry

    Predict the products of the chemical reaction aluminum + iron(III) oxide
  26. chemistry

    How many grams of methane gas were used to fill a baloon to a volume of 3.0 L at STP?
  27. Chemistry

    What is the geometry of XeF4? 1)tetrahedral 2)square planar 3)octahedral 4)seesaw 5)bent
  28. Chemistry

    From the lewis structure of AlCl4- where should I place the formal charge? next to Al or Cl?
  29. Chemistry Lab Math

    Prepare 600mL of a 100mM solution of glucose in 0.9% NaCl.
  30. chemistry

    How much 2.5mM solution of NaCl can be made from 30g of this pure salt?
  31. chemistry

    What is the solubility in moles/liter for copper(I) chloride at 25 oC given a Ksp value of 1 x 10-6
  32. Chemistry

    What is the theoretical justifaction for the order of reaction rates of a cycloalkane, cycloalkene, and benzene?
  33. College Chemistry

    A 50.0 mL sample of 6.0 M HCL is dulited to 200.0 mL. What is the new concentration of the acid?
  34. chemistry

    Write the 12 mole ratios that can be derived from the equation for the combustion of isopropyl alcohol?
  35. Chemistry

    Which compound would be ionic? H2O, CO2, SrCl2,SO2, H2S
  36. Chemistry!

    What is theoretical yield when 15.6g of bromobenzene & 8.3g of methyl benzoate is used in a Grignard reaction.
  37. Chemistry

    The pH of a buffer prepared from .30M H2X2O4 and .15M Na2C2O4(Ka of H2C2o4 is 5.6x10^-2
  38. chemistry(help please)

    Which acid,if it reacts in tincture of NaOH forms sodium hypochlorite?
  39. chemistry

    If 150 g of water are heated from 20.ºC to 30. ºC,the nunber of joules of heat energy absored is
  40. Chemistry

    how many moles of water are contained in 0.250 mile of CuSO4 * 5H2O? please help me
  41. Chemistry

    the mass of 4 moles of Co2 is ? (1)22g (2)44g (3)88g (4)176g please help !
  42. chemistry

    The molecular weight of H2SO4 is 98. The amount of the acid present in 400ml of 0.1M solution
  43. Chemistry

    Balance the Following Equations. _MgSo3+_HNO3->_Mg(NO3)2+_H2SO3
  44. Chemistry

    Compounds can be classified as acids or bases according to _____ different theories.
  45. Chemistry

    We are always told to use freshly prepared potassium iodide (KI) for titrations. Why?
  46. chemistry

    if you react magnesium solution and lead powder together is there a temperature change?
  47. chemistry

    what volume of 1.5M NaOH would be required to neutralize 0.65g of pure aspirin?
  48. Chemistry

    Chemical equation of: 1.Digesting of food 2.Fermentation of Wine 3.Burning of fuel
  49. chemistry

    Does Kv2SOv4, Kv2COv3 or KCv2Hv3Ov2 create the greatest increase in pH when mixed with water?
  50. chemistry

    what is the concentration of NaCl if 10 grams are dissolved in enough water to make 12 liters?
  51. chemistry

    How many grams of: 1.MgO 2.Cas would be produced if I had 3.8 moles of CaO
  52. Chemistry

    How much heat is evolved when 6.688 moles of Cu(s) is burned in excess oxygen
  53. ap chemistry

    What minimum volume of .2M Na2CO3 is needed to precipitate all the Sr 2+ from 25mL of .1M Sr(NO3)2
  54. Chemistry

    What is the density(g/L) of a gas mixture that contains 27.0% Fe and 73.0% He by volume at 714 mm Hg and 27.5 degrees Centigrade?
  55. chemistry

    Rank gases from highest average molecular speed to lowest Ne, HBr, CO
  56. chemistry

    how much lithium hydroxide will be needed to remove 75.0 grams of carbon dioxide?
  57. chemistry

    Calculate the "exact" alkalinity of a water that contains 0.6580 mg/L of bicarbonate, as the ion, at a pH of 5.66.
  58. chemistry

    What substance could be used to test if a sample of petrol contains any water as an impurity?
  59. Chemistry 1200

    0.238 M glucose (C6H12O6) in water (Assume the density of the solution is 1.00 g/mL.)
  60. chemistry

    when should the temperature be recorded for an experiment in order to determine the boiling point?
  61. Chemistry

    how could the amount of oxygen change the results in the synthesis of Magnesium oxide lab?
  62. chemistry

    Predict the empirical formula of the compound formed by each of the following pairs of elements.a) Li,S b) Na,H c) Al,l d) Ca,O
  63. Chemistry

    what would be the effect on a chromatographic peak of introducing the sample at too slow a rate
  64. Chemistry

    Calculate the volume of Sulfur dioxide produced when 27.9 mL of O2 reacts with carbon disulfide
  65. chemistry

    How do you calculate the weight of the following compounds? A)H2O2 B)C6H8O6 C)K2Cr2O7 D)C56H88O2
  66. chemistry

    How do you find the rate(mole rxn/L s) from .00014 M or Iodine, .57 M or acetone, and .18 M of H+ and 16.8 seconds?
  67. Chemistry

    what is the percent by mass of oxygen in propanal, CH3CH2CHO? the answer is 27.6 %. but i need to know why, please help !
  68. Chemistry

    Compare and Contrast the atomic theories proposed by Democritus and John Dalton.
  69. chemistry

    Which of the following contains ionic bonding? H2O2 PO33- P2O5 AlCl3
  70. Chemistry

    how to figure The grams of protein in 1 cup of soup that has 98 {\rm Cal} with 6 {\rm g} of fat and 8 {\rm g} of carbohydrate
  71. chemistry

    what mass of K2SO4 would you measure out to prepare 550 mL of a 0.76 M solution?
  72. Chemistry

    What is the concentration of a solution of 1.70 g of AgNO3 dissolved in enough water to make 250 mL?
  73. College Chemistry

    Molarity of .100 mole of urea (CH4N2O) in 250.0 mL of solution
  74. Chemistry

    Kc=1. The initial concentrations are A = 0M, B = 0M, C=10M. A+B --> C calculate the reaction quotient. (c)/(a)(b) = 10/0 .. is the answer zero?
  75. AP Chemistry

    What is the chemical equation that corresponds to the standard molar enthalpy of formation of N2O?
  76. chemistry

    calculate the volume of amonia that is produced at stp when 10.5 grams of N2 reacted with excess H2.
  77. chemistry

    calculate the volume of amonia that is produced at stp when 10.5 grams of N2 reacted with excess H2.
  78. chemistry

    What is the molar concentration of calcium hydroxide that has 0.185g solute in 100ml solution?
  79. Chemistry

    How many grams of potassium carbonate are needed to make 0.200 L of a 2.50M solution?
  80. general chemistry

    Calculate the de Broglie wavelength (in pm ) of a hydrogen atom traveling 445 m/s.
  81. chemistry

    why is it recommended to carryout iodometric titrations as quickly as possible and to get the first endpoint
  82. Chemistry

    If you were given 0.021 milligrams of the compound,H3PO4, what would the mass of H in the sample be?
  83. Chemistry

    Explain which atom of the following pair have the smaller ionization energy: As, I
  84. Chemistry

    Is it true that: An isotope has a different number of neutrons than protons in the nucleus of its atom.
  85. Chemistry

    Zn(s) + 2 HCl(aq) H2(g) + ZnCl2(aq) When 25.0 g of Zn reacts, how many L of H2 gas are formed at STP? 1. 0.382 L 2. 0.0171 L 3. 22.4 L 4. 8.56 L 5. 4.28 L
  86. chemistry

    What is the molar concentration of calcium hydroxide that has 0.185g solute in 100ml solution?
  87. chemistry

    How many grams of Lead (II) Nitrate are required to make a 350mL solution of 2.5M Pb2+?-
  88. Chemistry

    A brownie contains 1.30 ×102 mg of sodium. What is this mass equivalent to it in units of grams?
  89. chemistry

    What volume of 0.406 M KOH is required to completely react with 18.50 mL of 0.287 M H2SO4?
  90. Chemistry

    Write an equation for the reaction that takes place when LiOH is added to water.
  91. Chemistry

    Is there a reason for why you're allowed only three significant figures for molar masses?
  92. chemistry

    calculate the number of grams atom and gram molecules in 25.4milligrams of iodine ?
  93. chemistry

    draw the electronic configurationd for; 1.Iron chloride,2. Aluminium oxide,3. Benzene
  94. Organic Chemistry

    What is the major product from the sulfuric acid and Hg(II)-catalyzed hydration ethynylcyclohexane?
  95. Chemistry

    how many grams of potassium dichromate are needed to make 250 mL of a 0.75 molar solution?
  96. Chemistry

    how many grams of potassium dichromate are needed to make 250 mL of a 0.75 molar solution?
  97. Chemistry

    How many grams of CH3COOH are present in 2.5^3 of vinegar. Also, what is the formula needed to solve? Thanks!
  98. chemistry

    What is the concentraton of a solution made by dissolving 0.5 moles of solute in 9.0 liters of water?
  99. chemistry..

    to drbob222 ok, the pka (hclo) = 7.54 the ph = 7.35 this problem was under "preparing a buffer" section
  100. chemistry

    how do you predict the products of: (NH4)3PO4+ MgSO4-> HI-> Fe+o2-> Fe+ MgO-> HCl+ NaOH->
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