chemistry! URGENT

61,546 results, page 98

  1. Chemistry

    636 grams of Na2CO3(s) are disolved in 3.0 liters of aqueous solution
  2. chemistry

    What causes a tip that allows us to see the precessional period in NMR?
  3. Chemistry

    How many milliliters of 2.00 M HCl(aq) are required to react with 7.55 g of an ore containing 36.0% Zn(s) by mass?
  4. chemistry

    what is the wavelength of the radiation absorbed when an electron move from n=2 to n=5 for a helium +1 ion?
  5. chemistry

    calculate the de broglie wavelength of He atom at 27 degree celsius & v=2.4*1000
  6. Chemistry

    Calculate the equilibrium constant, k a reaction with delta G= -32.5 kj/mol at 25 degrees C
  7. Chemistry

    What mass of AgI can be produced from a 0.512g sample that assays 20.1% ALI3?
  8. Chemistry

    need help to balance half reaction in basic solution IO3 to I2
  9. Chemistry

    Help? How many moles of LiF would be required to produce a 2.5 M solution with a volume of 10.5 L?
  10. chemistry

    what is the concentration of a 250 ml solution that contains 44 grams of magnesium fluoride
  11. chemistry

    how many grams of oxygen are required to burn completely 570g of octane?
  12. chemistry

    Dissolve 0.590/(mol)of citric,C-6-8H-O7),in 135(1Kg)of water.
  13. chemistry

    Dissolve 0.590/(mol)of citric,C-6-8H-O7),in 135(1Kg)of water.
  14. chemistry

    Dissolve 0.590/(mol)of citric,C-6-8H-O7),in 135(1Kg)of water.
  15. Chemistry

    What is the density of 3.40 Liters of Hydrochloric acid (HCl) that has a mass of 24.5 grams?
  16. chemistry

    The subject is stoichiometry. How many moles of NH3 can be produced from 12.0mol of H2 and excess N2?
  17. chemistry

    What mass of nitric acid, in grams, can be made from 113g g of ammonia?
  18. chemistry

    the density aniline c6h5nh2 is 1.02g/mL how many molecules are present in 1.00Lsample
  19. chemistry

    CAN NaOH(aq)+Co2 yield NaHCO3 PLEASE ANSWER DEEPLY!!!!!!!!!!!!!!!
  20. Chemistry

    What are the benefit of letting the solutions of HCl(aq) and NaOH(aq) sit overnight?
  21. Chemistry

    How many atoms of hydrogen are in a mixture of 3.49x10^23 molecules of H2O and 78.1g of CH3OH?
  22. Chemistry

    Calculate the number of phosphorus atoms in 17.0g sample of calcium phosphate
  23. AP Chemistry

    assuming a density of 1.0 g/mL, calculate the molarity and mole fraction of 3.0% h2o2
  24. Chemistry

    What is the absolute entropy of 1.9 mol of gaseous ammonia at 2.8 bar and 298 K?
  25. Chemistry

    What is the absolute entropy of 1.9 mol of gaseous ammonia at 2.8 bar and 298 K?
  26. Chemistry

    How many years will it take for 88g tritium to decay to an 11g sample?
  27. Chemistry 12

    Calculate the mass of K2CRO4 needed to make 3.00 L of a 0.0200 M solution.
  28. Chemistry

    Is boron trichloride a Giant covalent or Simple molecular substance?
  29. chemistry

    What mass of oxygen is needed for the complete combustion of 5.00×10−3g of methane?
  30. chemistry -lab

    what would be the percent yield if 2.2 grams of aspirin is formed?
  31. chemistry

    What mass of magnesium chloride is formed in the reaction between 7 g of Mg and 7.9 g of Cl2
  32. AP Chemistry

    write an oxidation- reduction reaction for the reactants OCl- and S2O3-2
  33. Chemistry

    How many grams of NaCl are contained in 500ml of normal saline solution which is 0.85%(w/v).
  34. chemistry

    HI(aq)+KOH(aq)→H2O(l)+KI(aq) express this as a complete ionic equation
  35. chemistry

    How do you draw the structure of the reaction of 1-hexene with h2o in the presence of acid
  36. chemistry

    What is formed when zinc carbonate reacts with concentrated hydrochloric acid?
  37. Chemistry

    How could 2 molecular compounds react to create a precipitate and an aqueous solution?
  38. Chemistry

    Which of the following groups are indicative of anionic polymerization? a)F b)Cl c)COOCH3 d)H e)CH2CH3
  39. CHEMISTRY BALANCING CHEMICAL EQUATION

    H2SO4 + NaOC = Na2SO4 + H2O
  40. Chemistry

    I do not understand why this cannot go to equilibrium? Na2CO3(aq)+HCl(aq)->H2O(l)+CO2(g)+NaCl(aq)
  41. Chemistry

    Write down the electron configuration of the Cu(I) ion in the format 1s2_2s2_2p6_etc_etc.
  42. Chemistry

    Write down the electron configuration of sodium in the format 1s2_2s2_2p6_etc_etc.
  43. Chemistry (DrBob222)

    Is the relationship between delta G and Temperature inverse or direct?
  44. Chemistry

    What is [H+], [OH-], pH, and pOH for a 0.048mol/L solution of the weak benzoic acid, C6H5COOH?
  45. chemistry

    How can you convert the number of atoms of these isotopes 35Cl and 37Cl to percentage?
  46. chemistry

    how many grams of chromium are required to react with 125 mL of 0.75M CuSO4?
  47. chemistry

    What is the symbol equation of iron nails with copper sulfate solution.
  48. Chemistry

    A sample of NH3 gas occupies 75.0 liters at STP. How many molecules is this?
  49. Chemistry

    What would be the temperature change if 3.0g of water absorbed 15J of heat?
  50. chemistry

    if a coin with 3.0 cm diameter, 0.2 cm thickness weighs 10.377g, what are its volume and density?
  51. chemistry

    calculate the percentages by mass of the component element in sodium trioxonitrate(v)
  52. Chemistry

    What volume of oxygen at 25 degrees celsius and 93.5 kPa will use up 57.1 g of butane?
  53. chemistry

    3H2+N2=2NH3 if 2.70 g of H2 reacts with jugful of N ,how many grams of NH3 is formed?
  54. Chemistry

    Using the Krevzi method construct histidine and pyridoxine(Vitamin B6).
  55. chemistry

    how many grams of sodium oxalate, Na2C2O4, could be obtained from 213 g of C6H6?
  56. analytical chemistry

    How much NaOH (in grams) would there be in 0.25 litre of a 0.3M solution?
  57. Chemistry

    write a sentence for the following reaction PCl5(s)=PCl3(s)+Cl2(g)
  58. chemistry

    What is the molality of a solution composed of 28.4 g of methanol CH3OH and 250 g of water
  59. Chemistry

    How do I calculate moles from the given litres and mass of the substance (in grams)?
  60. Chemistry

    How do I calculate moles from the given litres and mass of the substance (in grams)?
  61. Chemistry

    The Maximum number of electrons that may occupy the third electron shell is A)2 B)8 C)10 D) 18
  62. Chemistry

    What atom is indicated by the following electron configuration. 1s^22s^12p^1 ?
  63. Chemistry

    Calculate [OH−] for 1.90mL of 0.190M NaOH diluted to 1.50L .
  64. Chemistry

    A solution has 189 grams of HNO3 dissolved in 1000L of water. What is pH?
  65. Chemistry

    How has crude oil changes the country (positive and negative points)
  66. Chemistry

    What would be the volume of 5.0 moles of gas at STP? Can you explain how to do it please?
  67. chemistry

    what volume of 1.5mols of tetraoxosulphate (iv) is needed to react with 2grams of calcium
  68. Chemistry

    How do I balance the following reaction in acidic conditions? N2O4 + S8 = NO + H2SO3????
  69. chemistry

    Molality is a unit of concentration that measures the moles of solute per
  70. chemistry

    What is (delta E) for the traansition of an electron from n=9 to n=4 in a Bohr hydrogen atom? What is the frequency? Thank you!
  71. chemistry

    how many grams of sodium metal are needed to give 781 g of hydrogen?
  72. Chemistry

    What is the concentration of hydronium ions in a solution that is 0.12 M HBrO(aq) and 0.160 M NaBrO(aq)?
  73. Chemistry

    I need to balance the equation of the reactants NaHCO3->CuCl2 please help me.
  74. Chemistry

    if the pressure read by the barometer is 0.882atm, what is the height of the column of mercury in cm?
  75. Chemistry

    The Ksp of manganese (II) hydroxide, Mn(OH)2 is 2.00x10^-13. Calculate the solubility of this compound in g/L?
  76. Chemistry

    What can be said about the presence of each of these groups of cations in the orginial solution
  77. chemistry

    how many moles of H2O are produced when 5.00 mols of oxygen gas are used
  78. Chemistry

    CIE and NIE for 2 K3PO4 + 3 Fe(NO3)2 = 6 KNO3 + Fe3(PO4)2
  79. Chemistry

    CIE and NIE for 2 K3PO4 + 3 Fe(NO3)2 --> 6 KNO3 + Fe3(PO4)2
  80. Chemistry

    he Ksp of mercury(II) hydroxide, Hg(OH)2, is 3.60 × 10-26. Calculate the solubility of this compound in g/L. I came up with x=2.8*10^-13
  81. chemistry

    write a reaction that show solid copper (II) nitrate dissociating.
  82. chemistry

    Hg2Cl2 = Hg + HgCl2 Please help me write the two half equations for this.
  83. chemistry

    In the reaction ZnO+2HCl=ZnCl2+H2O what is oxidized and what is reduced?
  84. Chemistry

    How many milliliters of 0.326 M HCl would be required to titrate 5.48 g KOH?
  85. chemistry

    How many grams of magnesium are required to produce a total of 4.05g of hydrogen
  86. Chemistry

    A 26.0 g sample of ice at -17.0°C is mixed with 124.0 g of water at 81.0°C. What is the equilibrium temperature?ºC.
  87. Chemistry

    How many atoms of each element are represented in the following: A.) 3NaCl B.) H2SO4 C.) 4H2SO4
  88. Chemistry

    Can alcohol dissolve any of these? PCl5 NaNO3 NH3 KOH KCl
  89. Chemistry

    Zn(s)+2HCl(aq) ->ZnCl2(aq)+Hx(g) How many millilters of 2.50M HCl(aq) are required to react with 3.95 of Zn(s)?
  90. Chemistry

    What are the Salts are taken into consideration in the calculation of the total alkalinity ????
  91. chemistry

    What are the products of the reaction between nitrous acid and strontium hydroxide?
  92. Chemistry

    Would it take more 0.1 M HCl or 0.1 M H2SO4 to neutralize 30 ml of NaOH?
  93. chemistry

    what will be the pressure of 0.010m of oxygen gas in a 4.5L flask at a temperature of 10,000C?
  94. Chemistry

    How many litters of Oxygen will be required to burn 3.8 liters of propane, C3H8?
  95. chemistry

    Calculate the amount of CO2 formed when 50 grams of CaCO3 decomposes?
  96. Chemistry

    How do i provide ionic equations , for example to this one --> HNO3(aq) + KOH(aq)
  97. Chemistry

    calculate the heat liberated when 15.0 g glucoseis metabolized to CO2 and H2O
  98. Chemistry

    How many kilojoules of heat are absorbed when 1.2 L of water is heated from 24oC to 86oC?
  99. Chemistry

    The temperature of a 2.25L sample of gas decreases from 45.0'C to 20.0'C. What is the new volume?
  100. chemistry

    Is it possible to identify a metal in a fragment if you only know the specific heat?
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