For the reaction H2(g) + I2(g) ↔ 2 HI(g), you have the initial concentrations [H2] = 0.15 and [I2] = 0.05. Keq for the reaction at this temperature is 4.5 x 10-6. Make a reaction table. Include rows for initial

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  1. chemistry

    What happens to the concentration of NO2(g)when the total pressure on the equilibrium reaction 2 Pb(NO3)2(s) <--> 2 PbO(s) + 4NO2(g) + O2(g) is increased (by compression)? 1. increases 2. Unable to determine 3. remains the same 4. decreases
  2. Chemistry 2

    Which is the oxidizing agent in the reaction below. Cr2O72- + 6S2O32- +14H+ > 2Cr3+ + 3S4O62- +7H20 A. Cr3+ B. S4O62- C. Cr2O62- D. S2O32- E. H+ I believe it's D or is it C not 100% sure please help. THANKS
  3. Chemistry (Stoichiometry)

    Two students react 15.50g of Lead (II) nitrate with 3.81g of sodium chloride. Predict the mass of the excess reactant left over when the reaction is complete.
  4. chemistry

    a 3.00g sample of baking soda is heated and decomposes according to the reaction below. Calculate the theoretical yield in grams for each of the three products Na2Co3. H2O, CO2
  5. marketing

    How might you use different types of research (focus groups, observation, survey, and experiment) to forecast market reaction to a new kind of disposable baby diaper?
  6. ap

    Which of the following is best described as an acid-base reaction? 1. NaCl + AgNO3 !NaNO3 + AgCl 2. NH3 + H2O ! NH+ 4 + OH− 3. 2HgO ! 2 Hg + O2 4. Ca + 2H2O ! Ca(OH)2 + H2 5. KCl + NH4NO3 ! KNO3 + NH4Cl
  7. Chemistry

    60.0 mL of 3.40 M sodium hydroxide is combined with 39.0 mL of 1.50 M magnesium chloride. What mass in grams of solid forms? (Hint: the total or overall reaction is most useful in doing calculations.) I got 485.1
  8. Chemistry

    Zinc reacts with hydrochloric acid according to the reaction equation: Zn(s)+2HCl(aq)->ZnCl2(aq)+H2(g) How many milliliters of 4.50M HCl1(aq) are required to react with 8.25g of an ore containing 30.0% Zn(s) by mass?
  9. chemistry

    Suppose that 0.450 of methane,CH4(g) , is reacted with 0.600 of fluorine, F2(g), forming CF(g) and HF(G) as sole products. Assuming that the reaction occurs at constant pressure, how much heat is released?
  10. chemistry

    CH3CH2CHCHCH3 --HIO4-> | | HO OH Include all steps of reaction, any additional reagents/conditions needed and the products formed. ive been stuck on this for hours need help please
  11. Chemistry

    3C3H8 + 20H2CrO4-->9CO2 + 10 Cr2O3 + 32H2O What mass of chromium (III) oxide will be formed by complete reaction of 1.50g of propane with 35.0ml of 6.26M chromic acid?
  12. Chemistry

    3C3H8 + 20H2CrO4-> 9CO2 + 10Cr2O3 + 32H2O Suppose you want to make 1.50 g of chromium (III) oxide, how many ml of 6.25M chromic acid will you need to use if the percent yield of the reaction is 68.6%?
  13. chemistry

    Use the reaction shown to calculate the mass of iron that must be used to obtain 0.500 L of hydrogen at STP: 3Fe(s) + 4H2O(l) pr029-1.jpg Fe3O4(s) + 4H2(g
  14. chemistry

    the standard free energies of formation of SO2(g) and SO3(g) are -300.4 and -370.4kJ mol-1 respectively. Calculate the value of the equilibrium constant at 25'C for the reaction 2SO2(g)+O2(g)==>2SO3(g)
  15. chemistry

    You weigh out 1.70 g of sodium carbonate monohydrate, dissolve it in water and react it with 15.00 mL of 2.00 M HCl. Write an equation for the reaction and calculate the expected mass of carbon dioxide that will be produced.
  16. Chemistry

    You weigh out 1.20 g of sodium carbonate monohydrate, dissolve it in water and react it with 15.00 mL of 2.00 M HCl. Write an equation for the reaction and calculate the expected mass of carbon dioxide that will be produced.
  17. Physics!

    Consider someone in a rotating space habitat. The outward force felt by the person A.has no reaction counterpart B.is an interaction with Earth C.is a form of gravity D.is real in the traditional sense
  18. Chemistry

    How many grams of commercial C2H4O2 (97% pure by mass) must be allowed to react with an excess of PCl3 to produce 50.0g of C2H3OCL if the reaction has a 70% yield? 3C2H4O2 + PCl = 3C2H3OCl + H3PO4
  19. CHEMISTRY

    1 mole of nitroglycerin decomposes and release 5.72*10^3 KJ heat. to give CO2 H2O O2 and N2. A) write the balanced chemical equation B) calculate the work done assuming the temp of the reaction is 450K
  20. science

    I did the work for this lab but forgot to record the data. It was a double displacement of CuSO4 and NaCO3. If someone could help me with the visual reaction that would help me out a lot. I know what to do I just don't remember what happens.
  21. chemistry

    2CH3OH(g)→2CH4(g)+O2(g)ΔH=+252.8kJ For a given sample of CH3OH, the enthalpy change during the reaction is 82.2kJ . How many grams of methane gas are produced?
  22. Chemistry

    When HgO is heated, it decomposes into elemental mercury and molecular oxygen gas. If 64.0 g of Hg is obtained from 85.0 g of the oxide, what is the percent yield of the reaction? The balanced equation is 2HgO > 2Hg + 02.
  23. chemistry

    When you add 0.320 g of sodium metal to an excess of hydrochloric acid, you find that 3330 J of heat are produced. What is the enthalpy of the reaction as written below? 2Na(s) + 2HCl(aq) --> 2NaCl(aq) +H2(g
  24. Chemistry ( I NEED HELP REAL QUICK )

    How much Al is needed to react with 675 mL of 0.655M HCl solution according to the reaction => 2Al + 6HCl→2AlCl3+ 3H2 Help your friend!
  25. Chemistry

    Exercise 14.55 Consider the reaction: NiO(s)+CO(g)⇌Ni(s)+CO2(g) Kc=4000.0 at 1500 K When calculating the answer, do not round to the appropriate number of significant figures until the last calculation step..
  26. chemistry

    When you add 0.567 g of sodium metal to an excess of hydrochloric acid, you find that 5890 J of heat are produced. What is the enthalpy of the reaction as written below? 2Na(s)+2HCl(aq)=2NaCl(aq)+H2(g)
  27. Chemistry

    Given info: Time(s). (ClO) mol/L 0.0. 0.012 4.0. 0.008 8.0. 0.005 12.0. 0.0035 16.0. 0.0025 20.0. 0.002 24.0. 0.0018 28.0. 0.0017 Calculate the average rate of the overall reaction
  28. Chemistry

    Using a closed system experiment will a leak during gas evolving reaction overstate or understate the amount of sodium bicarbonate in an alka seltzer cold tablet?
  29. Science - chemistry

    Write the complete ionic equation for the reaction of magnesium phosphate with lead (II) nitrate. Include which ions will be aqueous and which compound will precipitate. (Valences: Mg=+2, PO4=-3, Pb=+2, NO3=-1)
  30. AP Chem

    I missed a lab in class a week ago and had to make it up just the other day. My teacher didn't have time to explain the lab to me, so he gave me a brief overview of the procedure. The objective of the lab was to calculate the specific heat of an unknown block of metal. The ...
  31. Chemistry+balancing equation tips

    We are on combustion reaction at the moment in chemistry, and I have to say, these reactions are like extremely hard to balance(well, just alot of erasing). It takes me a while to balance combustion reactions and I want to know if theres any tips in balancing them? Should I ...
  32. biology

    Design a way to determine the effects of different concentrations of starch on the mass of dialysis tubing bags when the bags are allowed to sit water for several hours. Plan to put different concentrations of starch solutions in the bags. You may want to use iodine as a ...
  33. Chemistry

    5.0 g of NaNO3 is dissolved in 50.0 g of water. The initial temperature of the water was 21 degrees Celsius and the final temperature of the water is 15.7 degrees Celsius. 1)Calculate the heat of solution, DeltaHsolution. 2) calculate the heat of solution, DeltaHsolution, per ...
  34. Chemistry

    5.0 g of NaNO3 is dissolved in 50.0 g of water. The initial temperature of the water was 21 degrees Celsius and the final temperature of the water is 15.7 degrees Celsius. 1)Calculate the heat of solution, DeltaHsolution. 2) calculate the heat of solution, DeltaHsolution, per ...
  35. chemistry

    5.0 g of NaNO3 is dissolved in 50.0 g of water. The initial temperature of the water was 21 degrees Celsius and the final temperature of the water is 15.7 degrees Celsius. 1)Calculate the heat of solution, DeltaHsolution. 2) calculate the heat of solution, DeltaHsolution, per ...
  36. History

    For HW we have to do test corrections on our practice exam, so if any of you know the answers to these I'd appreciate it. =] 1. English Puritanism developed during the reign of Elizabeth I .. A) in reaction to the failure of the Elizabethan Religious Settlement to the ...
  37. math

    The largest bubble chamber in the world is 15 ft in diameter and contains 7259 gal of liquid hydrogen at a temperature of 2247°C. If the temperature is dropped by 11°C per hour for 2 consecutive hours, what is the new temperature
  38. algebra

    Write a formula that relates temperature t in degrees Fahrenheit at altitude h (in thousands of feet) and a ground temperature of 65ºF. State any restrictions on h. b. Find the temperature at 11,000 ft above Earth’s surface.
  39. math-precalculus

    Outside temperature over a day can be modeled as a sinusoidal function. Suppose you know the temperature varies between 73 and 87 degrees during the day and the average daily temperature first occurs at 8 AM. How many hours after midnight, to two decimal places, does the ...
  40. chemistry

    in an experiment 5.00ml of 0.1440 mol L^1- aqueos KIO3 was reacted with an excess of aqueous iodide and the molecular iodine I2, Formed was titrated against 0.1000mol L^1- aqueous S2O3^2- the equation for the titration reaction is: I2(aq)+ 2 S2O3^2-(aq)---->S4O6^2-(aq)+ 2I...
  41. Physics

    As an environmentally friendly idea, some have proposed using the temperature gradient of the ocean to generate electricity. This system would use the temperature gradient between the surface of the ocean (at about 200 C) and the water temperature at a depth of about 1 km (at ...
  42. physics

    As an environmentally friendly idea, some have proposed using the temperature gradient of the ocean to generate electricity. This system would use the temperature gradient between the surface of the ocean (at about 200 C) and the water temperature at a depth of about 1 km (at ...
  43. chem

    which one of the following statements about sulfuric acid is correct? A. sulfuric acid is a known muriatic acid B. sulfuric acid is a strong oxidizing agent C. sulfuric acid has little effect on metals D. sulfuric acid is dangerous to living organisms B and D are both correct...
  44. Operations with Integers

    On a summer day, the low temperature of 75°F was reached at 6 am. The high temperature was reached 9 hours later, after the temperature rose 16°F. What was the high temperature that day?
  45. Statistics

    An investigational drug study is being conducted. The initial screening phase needs to include enough people so that the final (approved) group has at least 10 patients. The probability of a person being approved for the study is .80. what initial sample size is needed to make...
  46. History

    Image of the dirty massacre american colonists What impact do you think seeing the image have on the American colonists? By confirming the rumors of illegal actions taken by bostonians the engraving would weaken the rebels cause By confirming the reaction the British would ...
  47. physics

    A metal container, which has a mass of 9.4 kg contains 14.2 kg of water. A 1.7-kg piece of the same metal, initially at a temperature of 160.0°C, is dropped into the water. The container and the water initially have a temperature of 15.0°C and the final temperature of the ...
  48. Science

    What is the final pressure of the gas relative to its initial pressure when there is an increase in Kelvin temperature of a cylinder of compressed gas by a factor of 2.7?
  49. chemistry

    What is the final pressure gas sample that is subjected to a temperature change from 22.0 C to 30.0 C and a volume change from 85.4 L to 37.0 L with an initial pressure 105 kPa?
  50. chem

    State the type of reaction. Predict the products of the reactions. I have no clue how to do this any help? C3H8 + O2 ---> Mg + HCl ---> AgNO3 + NaCl ---> CuSO4 + Zn ---> How much of this do you know how to do? Just checking answers. Give us your answers and we ...
  51. chemistry

    If the acid base reaction HA(aq)+B^-(aq)---> HB(aq)+A^-(aq) <--- has a k = 10^-4,which of the following statements are true & why? (a)HB is a stronger acid than HA (b)HA is a stronger acid than HB (c)HA & HB have same acidity (d)B^- is a stronger base than A^- (e)A^- is ...
  52. CHEM 101 (edited)

    Calculate ΔHrxn for the following reaction: CaO(s)+CO2(g)→CaCO3(s) Use the following reactions and given ΔH values: Ca(s)+CO2(g)+1/2O2(g)→CaCO3(s), ΔH= -812.8 kJ 2Ca(s)+O2(g)→2CaO(s), ΔH= -1269.8 kJ I have literally tried everything and I don't understand what I am ...
  53. Physics

    I posted this question before and i really need help on it... A pitcher throws a baseball to a batter at 95 mph from a distance, d, away. The batter swings and hits the ball. (5280 ft = 1 mi, g = 32.174 ft/s/s). a) Assuming the pitch travels the full distance, d, how much ...
  54. Math word gr 8

    For the month of January, the average afternoon temperature in Calgard is 1/4 the average morning temperature. The average afternoon temperature is -4 C. What is the average morning temperature? a.) If m represents the average morning temperature, what equation models this ...
  55. Physics

    Two masses, mass A (1.9 kg) and B (3.3 kg) are hung on either side of a pulley. The masses each have an initial speed of 0.8 m/s, with mass B moving up. How high, in m, does mass B move after being released at this initial speed?
  56. Chem

    A student was performing an extraction procedure of o-Xylene from water into octanol. The total mass of o-Xylene was 0.10 gram (molecular weight 106.2 g/mole). The volume of water was 990mL and volume of octanol 10 mL. There is a head space of 200 mL above the solution and it ...
  57. chemistry

    n-pentane and 1-butanol have nearly the same molecular weights but significantly different change in temperature values. explain the difference in change in temperature values of these substances based on their intermolecular forces.
  58. Chemistry

    What are the concentrations of A– and HA after 24 mL of 0.33 M hydrochloric acid solution is added to 86 mL of a solution that has [A– ]=0.67 M? Do NOT consider any equilibrium reactions in this problem. A–(aq) + HCl(aq) → HA(aq) + Cl–(aq) How do I calculate this...
  59. Is anyone here a chemistry genuis?

    The formate ion, (CHO2-), is related to the acetate ion and forms ionic salts with many metal ions. Assume that 9.7416 g of M(CHO2)2 (where M represents the atomic symbol for a particular metal) are dissolved in water. When a solution of 0.200 M sodium sulfate is added, a ...
  60. Chemistry

    If very small concentrations of NaCl and AgNO3 are mixed, no precipitate forms. However, if large concentrations are mixed, a white precipitate forms. Can someone tell me a method for testing the hypothesis that "insoluble" salts would dissolve to some extent in water and are ...
  61. Chemistry

    If very small concentrations of NaCl and AgNO3 are mixed, no precipitate forms. However, if large concentrations are mixed, a white precipitate forms. Can someone tell me a method for testing the hypothesis that "insoluble" salts would dissolve to some extent in water and are ...
  62. physics

    Figure 2-42 shows a simple device for measuring your reaction time. It consists of a cardboard strip marked with a scale and two large dots. A friend holds the strip vertically, with thumb and forefinger at the dot on the right in Figure 2-42. You then position your thumb and ...
  63. CHEMISTRY HELP!!

    Formic acid (HCHO2) is a component of bee stings. It is a weak acid and dissociates according to the equilibrium shown below: HCHO2 <===> H+ + CHO2- Kc = 1.8 x 10-4 For a 0.5 M solution of formic acid, we wish to determine the equilibrium concentration of H+. Complete ...
  64. Science

    Any help would be appreciated! Which of the following is a way to improve the efficiency of a heat engine? increase Qh reduce Qh reduce Wnet increase Qc A What are the energies associated with atomic motion called? kinetic energy potential energy bond energy internal energy D ...
  65. Science

    Any help would be apreciated! Which of the following is a way to improve the efficiency of a heat engine? increase Qh reduce Qh reduce Wnet increase Qc A What are the energies associated with atomic motion called? kinetic energy potential energy bond energy internal energy D A...
  66. Chemistry s103 Q5

    struggling to get this to come out right: Compound 1 CH2=CH-CH-OH | CH3 + Compound 2 O || CH3-CH-CH2-C | OH | | ? (i) identify any functional groups in compounds 1 & 2 by circling them and naming them clearly. (ii) complete the equation for reaction 1 by drawing the ...
  67. chemistry

    Aerosol cans have a label that warns the user not to use them above a certain temperature and not to dispose of them by incineration. Even an empty can contains residual gaseous propellant. For example, the residual pressure in a can is 1.36 atm when it is sitting on a shelf ...
  68. Chemistry

    How do these react? Some may have no reaction. a. aqueous chromium(III) nitrate plus magnesium metal b. aqueous lithium sulfate plus aqueous barium chloride c. solid lead metal plus aqueous potassium chloride d. aqueous lithium fluoride with aqueous ammonium phosphate
  69. chemistry

    The reaction: A + 3 B = D + F was studied and the following mechanism was finally determined A + B = C (fast) C + B = D + E (slow) E + B = F (very fast) The step with largest activation energy is a. the first step b. the second step c. the third step d. none of the steps has ...
  70. chemistry

    Water (2690 ) is heated until it just begins to boil. If the water absorbs 5.29×105 of heat in the process, what was the initial temperature of the water?express answer in Celsius.
  71. Analytic Chemistry

    At 25 °C, you conduct a titration of 15.00 mL of a 0.0260 M AgNO3 solution with a 0.0130 M NaI solution within the following cell: Saturated Calomel Electrode || Titration Solution | Ag (s) For the cell as written, what is the voltage after the addition of the following ...
  72. CHEMISTRY

    Wondering If I did this correctly so far 50.0 ml of a 0.0500 M solution of lead (II) nitrate is mixed with 40.0 ml of a 0.200 M solution of sodium iodate at 25°C. Calculate the Pb2+ and IO3- concentrations when the mixture comes to equilibrium. At this temperature the Ksp for...
  73. physics(gas laws)

    Got a question 3. Given 325 ml of saturated gas at 760 mmHg and 25°C, what would be its volume if dry at the same pressure and temperature? I got confused when I read 'if dry' Does that mean I have to subtract something out of 760mmHg? And would I used the combined gas law ...
  74. chemistry

    In a certain chemical reation, two reactants undergo change to form two products. Why can't you determine what type of reaction occurred from this information?
  75. CHEMISTRY URGENT PLZ HELP

    Write a balanced equation for the following reduction-oxidation reaction. SO3(2-) + MnO4(-) --- SO4(2–) + Mn(2+) can someone help me step by step??
  76. Chemistry

    When we test for carbon dioxide gas, we bubble it through limewater and get a white precipitate CaCO3. What is the equation for the reaction? Is it CO2 + Ca(OH)2 --> CaCO3 + H2O
  77. chemistry

    For the reaction that occurs in the voltaic cell, Fe(s)|Fe2+(aq)||Cr3+(aq), Cr2+(aq)|Pt(s) determine E°cell. I don't understand how the Pt(s) would be used to solve this question. Please help!
  78. science-chemistry

    what causes an acid-base reaction to occur? (hint: think about the products that form) I know salt and water form but I don't know why it happens...
  79. physics!

    If the speed of a car is increased by 35%, by what factor will its minimum braking distance be increased, assuming all else is the same? Ignore the driver's reaction time.
  80. chemistry

    Write the complete balanced molecular, ionic,and net ionic equations for the reaction of nickle II chloride + sodium phosphate. Which product,if any, is a precipitate?
  81. Chemistry

    Time, (min): 0 10 20 30 Moles,(trans): 1.00 0.90 0.81 0.73 Given the following data, what is the order of the reaction? How long will it take for the half of the trans compound to decompose?
  82. chemistry

    Balance equation for reaction occuring in basic solution. CrO4{2-}+S{2-}gives S+CrO{-} i don't know how to balance the charges in this way of balancing please teach me how to do it?
  83. Chemistry

    How many moles of ammonium sulfate can be made from the reaction of 30.0 mol of NH3 with H2SO4 according to the following equation? 2NH3  H2SO4 ¨ (NH4)2SO4
  84. Chemistry

    Which of the following does NOT take place in a chemical reaction? a-new substances are formed b-neutrons are released c-energy is released or absorbed d-reactants disappear
  85. chemistry 12

    In a complete sentence, give an example of a reaction rate that concerns many Canadians - one that involves cars, cold mornings, and cold batteries.
  86. Chemistry

    27.0 mL of 1.00 M HClO4 are mixed with 27.0 mL of 1.00 M LiOH in a coffee cup calorimeter. The calorimeter constant is 28.1 J/C. Both were initially at 21.31 C. Calculate delta H(rxn) in kJ/mol for the reaction.
  87. Chemisty

    When the gases dihydrogen sulfi and oxygen react, they form the gases sulfu dioxid and water vapor. How od you write a balanced equation for the reaction?
  88. Intro Chem

    4Al(s) + 3O2(g)2Al2O3(s) Delta H reaction = -3351.4 kJ How much energy is transferred when 42.6 g of aluminum reacts to form aluminum oxide? Thanks
  89. chemistry

    Consider the reaction 2Al + 3CuSO4 = Al2(SO4)3 + 3Cu What is the maximum amount of Cu (63.5 g/mol) that could be produced by reacting 20.0 grams of Al (27.0 g/mol) with excess How do i do this?
  90. chemistry urgent

    given the reaction: 2 Al + 3 H2SO4 -> Al2(SO4)3 + 3 H2 what volume of H2 gas measured at STP will be produced from 5.4 grams of AL reacting with an excess of H2SO4?
  91. chemistry

    using the balanced equation for the fermentation reaction, calculate for the theoretical amount of alcohol to be produced using 10 grams of sucrose. 0.79 g/ml is ethanol's density.
  92. Chem

    Write the balanced net ionic equations for the reaction of a) added H+ and B) added OH- with the components of the acetic acid/sodium acetate buffer solution:
  93. chemistry

    H2 (g) is made when 8.5 grams of Li is placed in water. The reaction also creates Lithium Hydroxide. Li + H2O --> LiOH + H2 How much H2 (g) is made? (the (g) means gas!)
  94. chemistry

    write a balanced equation for this reaction. find out the mass of hydrogen chloride gas needed to react completely with 0.20 g of ammonia gas.
  95. Chemistry

    Express the rate of the reaction 2C2H6 + 7O2 -> 4CO2 + 6H2O in terms of: a. Delta [C2H6] b. Delta [CO2] Show work please
  96. in-organic chemistry

    provide balanced equations that represent the thermal decomposition of sodium nitrate and calcium nitrate; compare and comment on the products of each reaction.
  97. Chemistry Help!!

    sodium metal reacts violently with water to produce aqueous sodium hydroxide and hydrogen gas. calculate the enthalpy change for this reaction.
  98. Translation

    I am in a translation class and the sentence contains this phrase can you tell me what it means The city was brutal in its reaction wiping 50 3/4p off the share price what does 50 3/4p stand for
  99. chemistry

    A chemist titrates 17.44 mL of 0.346 M NaOH into a flask containing 50.13 mL of 0.179 M HCl. When the titration is complete, the pH of the solution in the reaction flask is? 12.64 .0919 1.36 2.22 11.78
  100. chem

    Sorry I wrote that wrong. The exact question from the textbook says, 'Comment of the effect of concrentration of reaction time.' I don't really understand the question.
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