chemistry

Most popular questions
  1. Chemistry

    The energies, E, for the first few states of an unknown element are shown here in arbitrary units: n= 1, E=-21 n=2, E=-9 n=3, E=-4 n=4, E=-3 ...,... infinity, 0 A gaseous sample of this element is bombarded by photons of various energies (in these same

    asked by tec on March 19, 2014
  2. Chemistry

    Hi. Is PO4(3-) polar or non-polar? Why or why not? Thanks! Look up the electronegativity of P and O. I think I remember that O is about 3.5 and P is about 2.1; therefore, each P-O bond is somewhat polar. Thus, the ion will be polar unless the Lewis

    asked by Sally on November 23, 2006
  3. Chemistry

    Identify the predominant intermolecular force in each of these substances. 1. Hydrogen 2. Dipole-Dipole 3. London A)H20 B)NH3 C)CH3 C=O OCH3 D)CH4 E)CH OH-C-OH CH3 what I have so far is A) 1 B) 1 C) 2 D) 3 E) I'm not sure about E, I think it might be

    asked by Dan on December 7, 2015
  4. Chemistry

    Consider the following reaction: 2Fe2O3 --> 4Fe + 3O2 ∆Hrxn° = +824.2 kJ The decomposition of 29.0 g of Fe2O3 results in a. the release of 150 kJ of heat b. the release of 12000 kJ of heat c. the absorption of 12000 kJ of heat d. the absorption of 150

    asked by Anonymous on September 21, 2013
  5. Chemistry

    1. Which of the following metals is oxidized by calcium ions? *potassium zinc iron lead 2. The first electrochemical cell was invented by ____. Michael Faraday *Alessandro Volta James Maxwell Benjamin Franklin 3. Why can't a lead storage battery be

    asked by Jack on March 28, 2013
  6. chemistry

    What is the complete ionic equation for CaS(aq) +CuCl2(aq)=CuS(s)+CaCl2(aq)

    asked by lupe on April 8, 2010
  7. chemistry

    Is NH4+ a polar or nonpolar bond?

    asked by Lin on November 30, 2007
  8. Chemistry

    2H2+O2 -> 2H20 changeHrxn=-484 KJ Which answer best describes the transfer heat that occurs when 1.30 mol of H2 reacts? 629 KJ released 315 KJ absorbed 315 KJ released 484 KJ absorbed 484 KJ released 629 KJ absorbed

    asked by Anonymous on October 9, 2012
  9. chemistry

    Complete and balance the molecular equation, including phases, for the reaction of aqueous ammonium bromide, NH4Br, and aqueous lead(II) acetate, Pb(C2H3O2). Enter the balanced net ionic equation, including phases, for this reaction.

    asked by Kelly on October 23, 2012
  10. Chemistry

    Consider the decomposition of a metal oxide to its elements, where M represents a generic metal. M203(s)---> 2M(s) + 3/2 O2(g) info given for Gf(kJ/mol): M203= -10.60 M(s)=0 O2(g)= 0 1.) what is the standard change in Gibbs energy for rxn as written in

    asked by Kelsey on March 15, 2012
  11. Chemistry

    A solution of household bleach contains 5.25% sodium hypochlorite, NaOCl, by mass. Assuming that the density of bleach is the same as water, calculate the volume of household bleach that should be diluted with water to make 500.0 mL of a pH = 10.10

    asked by JayJay on May 29, 2013
  12. Chemistry

    Write a balanced net ionic equation (include physical states) for the following reaction: Fe(NO3)3(aq) + LiOH(aq) → LiNO3(aq) + Fe(OH)3(s)

    asked by Emily on June 27, 2011
  13. Chemistry

    The Hydrolysis Reactions - Write net-ionic equations for the reaction of each salt with water below. If there is no reaction, write N.R. 1. NH4C2H3O2 2. NH4Cl 3. NaCl 4. Na2CO3 5. NaC2H3O2 6. NaHSO4 7. FeCl3 8. NaH2PO4 9. NaHCO3

    asked by K on April 30, 2011
  14. Chemistry

    At 25C only .0190 mol of the generic salt AB2 is soluble in 1.00L of water. What is the Ksp of the salt at 25C? AB2A^2+ + 2B^- I took the .0190 mol and doubled it and multiplied by .019 again and got 6.859x10^-6 and got it wrong what should I do? Please

    asked by Cat on July 20, 2013
  15. chemistry

    Which of the following reactions have a positive ΔSrxn? Check all that apply. A(g) +B(g) -----> 3C(g) A(g)+ B(g)------> C(g) 2A (g) +2B (g)-----> 3C(g) A(s)+B(s)------> C(g) I picked the first one and it marked me wrong. Please help(:

    asked by Jerry on March 14, 2012
  16. Chemistry

    how do i write the complete electron configuration for Ga3+ and Mg2+????????????

    asked by mariana on August 4, 2013
  17. Chemistry

    Using the following data calculate Delta Sfus and Delta Svap for K in J/mol-k Tm(K) = 336, Delta H Fus(kJ/mol) = 2.33, Tb (K) = 1033, Delta H vap (kJ/mol) = 77.1 For Delta S fus i'm supposed to use 336 K the Tm value and for Delta S vap i'm supposed to use

    asked by Katherine on March 9, 2012
  18. Chemistry

    How much work must be done on a system to decrease its volume from 14.0 L to 5.0 L by exerting a constant pressure of 4.0 atm?

    asked by Anonymous on October 22, 2014
  19. chemistry

    Suppose you take a trip to a distant universe and find that the periodic table there is derived from an arrangement of quantum numbers different from the one on Earth. The rules in that universe are: 1. principal quantum number n = 1, 2, . . . (as on

    asked by Anonymous on April 2, 2013
  20. Chemistry

    When the oxide of generic metal M is heated at 25.0 °C, only a negligible amount of M is produced. O2M(s) ----> M(s) +O2(g) delta G= 288.9 Kj/mol When this reaction is coupled to the conversion of graphite to carbon dioxide, it becomes spontaneous. What

    asked by Jerry on March 14, 2012
  21. chemistry

    how do i write a net ionic equation for Lead (II) Nitrate and Sodium Carbonate react to form Lead Carbonate and Sodium Nitrate??

    asked by caren on December 11, 2007
  22. Chemistry

    Balance the following redox equations. All occur in Acidic solutions. 1. Cr2O7^2-^ + C2O4^2-^ -> Cr^3+^ + CO2 2. Cu + NO3^-^ -> CU^2+^ + NO 3. MnO2+ HNO2 -> Mn^2+^ + NO3^-^ 4. PbO2 + Mn^2+^ + SO4^2-^ -> PbSO4 + MnO4^-^ 5. HNO2 + Cr2O7^2-^ -> Cr^3+^ +

    asked by Yukiko on September 3, 2008
  23. chemistry

    For the following reaction KClO2->KCl+O2 assign oxidation states to each element on each side of the equation. Reactants K=? Cl=? O=? Which element is reduced? I got K=5, Cl=-1, and O=-4 . The element that reduced is K, but its says its wrong. Help,

    asked by chris12 on November 20, 2016
  24. Chemistry

    Which of the following electron configurations of neutral atoms represent excited states? ( ) [Xe]6s24f1 ( ) 2s2 ( ) 1s22s22p63s23p63d2 ( ) [Ar]4s23d3 ( ) [Kr]5s14d5

    asked by Garcia on November 11, 2012
  25. chemistry

    Write the balanced chemical equation for each of these reactions. Include phases. When aqueous sodium hydroxide is added to a solution containing lead(II) nitrate, a solid precipitate forms. However, when additional aqueous hydroxide is added the

    asked by Katie on February 13, 2012
  26. chemistry

    what volume (in ML) of a 0.150 M HNO3 solution is required to completely react wtih 35.7 mL of a 0.108 M Na2CO3 solution according to the following balanced chemical equation? Na2CO3(aq) + 2 HNO3(aq) --> 2NaNO3(aq) + H2O(l) then, in the reaction above,

    asked by samantha on June 21, 2010
  27. Chemistry

    Which of the following substances have a standard heat of formation (ÄHf°) of zero? O2(g) at 25.0 degree C and 1 atm Fe at 1200 degree C C2H6(g) at standard conitions Cl2(g) at 2 atm

    asked by Anonymous on October 9, 2012
  28. Chemistry

    What would the net ionic equation be for : HBr (aq) + KOH (aq) = KBr + H2O

    asked by Emma on October 15, 2017
  29. CHEMISTRY

    Consider the following balanced equation: 2N2H4(g)+N2O4(g)→3N2(g)+4H2O(g) Complete the following table showing the appropriate number of moles of reactants and products. If the number of moles of a reactant is provided, fill in the required amount of the

    asked by Run on October 5, 2014
  30. Chemistry

    How would the dx2−y2 orbital in the n=5 shell compare to the dx2−y2 orbital in the n=3 subshell? True or False 1.The contour of the orbital would extend further out along the x and y axes. 2. The value of ℓ would increase by 2. 3.The radial

    asked by Kristine on April 24, 2014
  31. Chemistry

    Classify the possible combinations of signs for a reaction's ∆H and ∆S values by the resulting spontaneity. A) Spontaneous as written at all temperatures. B) Spontaneous in reverse at all temperatures. C) Spontaneous as written above a certain

    asked by Jessica on November 9, 2011
  32. Chemistry

    For the following chemical reaction... HCN (aq) + KOH (aq)----> H2O (l) + KCN (aq) write the net ionic equation, including the phases

    asked by Chelsea on October 4, 2013
  33. Chemistry

    A 0.110-L sample of an unknown HNO3 solution required 52.1 mL of 0.150 M Ba(OH)2 for complete neutralization. What was the concentration of the HNO3 solution?

    asked by Lori on November 9, 2013
  34. chemistry

    Write the balanced equation for the neutralization reaction between H3PO4 and NaOH in aqueous solution. Phases are optional.

    asked by Karen on May 14, 2014
  35. Chemistry

    The measured potential of the following cell was 0.1776 volts: Pb|Pb2+(??M)||Pb2+(1.0M)|Pb Calculate the electrode potential of the unknown half-cell(anode). Not sure how to approach this, considering the molarity is unknown. There isn't a lot of space on

    asked by Alex on March 27, 2014
  36. chemistry

    the reaction of 7.10g carbon with excess O2 yields 12.25g of CO2. what is the percent yield of this reaction? I have tried everything and looked through all of my notes and nothing is working for stiochiometry

    asked by Heather on October 6, 2014
  37. Chemistry

    Anthracene is a yellow, crystalline solid found in coal tar. Complete this structure for anthracene, C14H10, by adding bonds and hydrogen atoms as necessary. What type of hybrid orbitals are utilized by carbon in anthracene? >>sp3 How many σ bonds and π

    asked by Dan on November 22, 2015
  38. Chemistry

    In a lab, we added NH3(aq) to CuSO4(aq), and the solution turned dark blue with a precipitate. The problem is that the products ( Cu(NH3)4 and SO4) should be soluble, no? The question is then, what is the percipitate? The ppt is Cu(OH)2. The dark blue

    asked by Karl on December 17, 2006
  39. Chemistry

    NaI(aq)+Hg2(C2H3O2)2(aq)--> Express your answer as a chemical equation. Enter NOREACTION if no reaction occurs. Identify all of the phases in your answer. I need help! Someone please help..

    asked by Lalo on October 27, 2012
  40. Chemistry

    How many grams of dry NH4Cl need to be added to 2.10L of a 0.600M solution of ammonia,NH3 , to prepare a buffer solution that has a pH of 9.00? Kb for ammonia is 1.8x10^-5. I just wanted to make sure I dd this write, can you please check my work? Thank

    asked by Jessica on October 8, 2011
  41. chemistry

    disappearance of NO in ...- Help!!!? The following data were collected for the rate of disappearance of NO in the reaction 2 NO(g) + O2(g) ¨ 2 NO2(g). Run: [NO](M) [O2](M) Initail Rate (M/s) 1 .0126 .0125 1.41 X 10^-2 2 .0252 .0125 5.64 X 10^-2 3 .0252

    asked by Hannah on January 30, 2013
  42. Chemistry

    Part A Calculate the standard enthalpy change for the reaction 2A+B --->2C +2D Use the following data: Substance Delta H(kJ/mol) A -263 B -391 C +203 D -523 Express your answer in kilojoules. MY ANSWER FOR PART A: Delta H =277 kJ PART B----THIS ONE I NEED

    asked by tina on June 16, 2011
  43. Chemistry

    Which of the following will be more soluble in an acidic solution than in pure water? AgI, Ni(OH)2, KClO4, SrSO4, CaCO3

    asked by Mandy on December 5, 2013
  44. Chemistry

    1) What Physical properties, other than specific heat, could you use to help identify unknown metals? 2) Why is water an excellent material to use in a calorimeter? Density, color, resistivity (or conductitivy), melting point, crystallization. 2) water is

    asked by K. on September 21, 2006
  45. chemistry

    What are the spectator ions in the following complete ionic equation: Ba2+(aq)+2I−(aq)+2Na+(aq)+SO2−4(aq)→BaSO4(s)+2I−(aq)+2Na+(aq). Thank you so much!!!

    asked by Michelle on July 8, 2013
  46. chemistry

    Consider the reaction, C2H4 (g) + H2 (g)- C2H6 (g) where -137kJ of heat is released. How many kilojoules are released when 55.3g of C2H4 reacts?

    asked by Sandy on July 10, 2011
  47. Chemistry

    In which direction will the net reaction proceed. X(g) + Y(g) Z(g) .. Kp = 1.00 at 300k for each of these sets of initial conditions? 1) [X] = [Y] = [Z] = 1.0 M a] net reaction goes to the left [this one?] b] net reaction goes to the right c] reaction is

    asked by Tracy on March 5, 2012
  48. chemistry

    Write a balanced equation, ionic equation and the net ionic equation for the following: A) Li2SO4 + Sr(NO3)3 ---> B) H2SO4 + Na2CO3 --->

    asked by Mindu on January 12, 2015
  49. Chemistry

    At equilibrium, the concentrations in this system were found to be [N2] = [O2] = 0.100 M and [NO] = 0.500 M. N2(g) + O2(g) 2NO(g) If more NO is added, bringing its concentration to 0.800 M, what will the final concentration of NO be after equilibrium is

    asked by David on March 5, 2012
  50. Chemistry

    Imagine that you have a 7.00L gas tank and a 3.50L gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch. If you fill the larger tank with oxygen to a pressure of 135atm , to what

    asked by De'Brickashaw on August 20, 2014
  51. Chemistry

    The standard internal energy change for a reaction can be symbolized as ΔU°rxn or ΔE°rxn. For the following reaction equations, calculate the energy change of the reaction at 25 °C and 1.00 bar. Sn(s) + 2Cl2(g) --> SnCl4(l) ΔH°rxn = -511.3 kJ/mol

    asked by Anonymous on September 21, 2013
  52. chemistry

    The reaction of 2.5 mol of O2 with 4.6 mol of C3H8 will produce ________ mol of H2O.

    asked by Anonymous on October 26, 2014
  53. Chemistry

    At 298 K, the Henry\'s law constant for oxygen is 0.00130 M/atm. Air is 21.0% oxygen.At 298 K, what is the solubility of oxygen in water exposed to air at 1.00 atm? At 298 K, what is the solubility of oxygen in water exposed to air at 0.896 atm? If

    asked by Colleen on February 7, 2013
  54. chemistry

    Calculate the pH of the resulting solution if 30.0 mL of 0.300 M HCl(aq) is added to (a) 35.0 mL of 0.300 M NaOH(aq). (b) 40.0 mL of 0.350 M NaOH(aq).

    asked by anon on April 10, 2012
  55. chemistry

    For each trial, enter the amount of heat gained by the chemical system of ammonium nitrate, qrxn. The specific heat of water is 4.184 J/goC. Report your answer using 4 digits. The information given is: Trial # Tiwater Tf Masswater #1: 21.2 10.8 24.990 #2:

    asked by Megan on April 6, 2010
  56. chemistry

    Enter the net ionic equation for the reaction of aqueous sodium chloride with aqueous silver nitrate

    asked by ej on October 11, 2010
  57. chemistry

    Quantum numbers arise naturally from the mathematics used to describe the possible states of an electron in an atom. The four quantum numbers, the principal quantum number (n), the angular momentum quantum number (ℓ), the magnetic quantum number (mℓ),

    asked by Jordan on November 4, 2016
  58. chemistry

    Find the pH during the titration of a 20.00mL of 0.1000 M butanoic acid, CH3CH2CH2COOH (Ka=1.54 x10^-5), with the addition of 10 mL of 0.1000 M NaOH solution??

    asked by anonymous on April 9, 2012
  59. Chemistry

    Assuming equal concentrations , rank these solutions by pH. RbOH(aq), NH3(aq), HF(aq) HBr(aq), Ca(OH)2(aq). I know the most acidic solution has the lowest pH and the most basic solution has the highest pH. But how am i supposed to know the pH if i don't

    asked by Nia on October 17, 2011
  60. chemistry

    For the following fusion reaction, Calculate change in energy per mole.( Answer in J/mole) 2H1 + 2H1 ---> 3H1 + 1H1 (the mass number is in front of the atom and the atomic number is behind the atom) Given info:Atoms with their masses(amu) H-1 1.00782 H-2

    asked by Mima on April 28, 2012
  61. Chemistry

    The equilibrium constant (Kp) for the interconversion of PCl5 and PCl3 is 0.0121: PCl5 (g) ↔ PCl3 (g) + Cl2 (g) A vessel is charged with PCl5, giving an initial pressure of 0.123 atm. At equilibrium, the partial pressure of PCl3 is __________ atm. I have

    asked by Zack on April 20, 2018
  62. 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

    asked by Katie on December 6, 2009
  63. Chemistry

    Predict how the entropy of the substance is affected in the following processes: a) O2 (g,200 kPa, 300k) --> O2 (g, 100, 300k) b)Br2 (l, 1 bar, 25 degree C) --> Br2 (g, 1 bar, 25 degree C) C)Fe (s, 1 bar, 250 degree C)--> Fe(s, 1 bar, 25 degree C) will

    asked by Alexis on April 20, 2014
  64. Chemistry

    A colourless solution contains one type of ion. When one adds dilute HCl to it, a white precipitate initially forms. However, once more of the HCl solution is added, the precipitate dissolves. Explain why the ion is Pb2+ and not Al3+, Hg22+, Cu2+ nor Ag+.

    asked by Vic on September 3, 2007
  65. Chemistry

    Write a chemical equation representing the second ionization energy for lithium. use e- as the symbol for an electron.

    asked by anonymous on April 1, 2013
  66. Chemistry

    What is the maximum mass, in grams, of NH3 that can be produced by the reaction of 1.0 g of N2 and 1.0 g of H2 using the reaction below? N2+H2→NH3 (not balanced) A) 0.60 g B) 5.7 g C) 1.2 g D) 2.9 g

    asked by Katelyn on October 19, 2016
  67. Chemistry

    A critical reaction in the production of energy to do work or drive chemical reactions in biological systems is the hydrolysis of adenosine triphosphate, ATP, to adenosine diphosphate, ADP, as described by ATP(aq) +H2O (l) --->ADP(aq) +HPO4^2- for which

    asked by Jerry on March 14, 2012
  68. Chemistry

    Under standard conditions (298 K and 1 atm), which statement is true? a] diamond converts to graphite spontaneously b] graphite converts to diamond spontaneously c] none of the above How can the spontaneity of the reaction be reversed? a] increase the

    asked by Katherine on March 8, 2012
  69. Chemistry

    What is the name of the product formed by the reaction of propylide ion and 2-chloropropane? I'm having problem because I don't know the formula of propylide ion.

    asked by Jennifer on June 5, 2008
  70. Chemistry

    IN my experiment, I was doing a qualitative analysis of Group I and II anions using a flowchart. IN the chart I added 5 drops of 0.1M AgNO3 and several drops of 3M HNO3 to 5 drops of solution and found that a precipitate was formed. Thus it was classified

    asked by David on April 12, 2009
  71. Chemistry

    Ba(OH)2 is a strong electrolyte. Determine the concentration of each of the individual ions in a 0.700 M Ba(OH)2 solution. I know that Ba(OH)2 -> Ba + 2OH But how do I determine the concentrations? I feel like I am making this more complicated than need be

    asked by Hana on April 8, 2013
  72. Chemistry

    Many power plants produce energy by burning carbon-based fuels, which also produces CO2. CO2 is a greenhouse gas, so over-production can have negative effects on the environment. Use enthalpy of formation data to calculate the number of moles of CO2 (g)

    asked by Harold on January 27, 2011
  73. Chemistry

    Write a molecular equation for the precipitation reaction that occurs (if any) when the following solutions are mixed. If no reaction occurs, write NOREACTION. Are my answers below correct? I used the textbook 1. sodium chloride and lead (II) acetate

    asked by Jerry on October 5, 2010
  74. chemistry

    Which of the following diatomic species are paramagnetic and which are diamagnetic? A blank molecular orbital diagram (Part B 1 figure) has been provided to help you. Drag the formulas to the appropriate magnetic bin :C2^2+,Li2-,B2^2-

    asked by defferan on November 19, 2008
  75. Chemistry

    Calculate ΔG° for the following reaction at 298 K.? A+B --> 2D ΔH° = 775.0 kJ ΔS°=296.0 J/K C --> D ΔH° = 446.0 kJ ΔS°=-218.0 J/K A+B --> 2C ΔG° = ? kJ I know I am suppose to reverse the (C --> D) and add a coefficient of 2 to both the enthalpy

    asked by Alexis on April 20, 2014
  76. Chemistry

    Calculate the change in PH when 6 ml of 0.1 M HCl is added to 100 ml of a buffer solution that is 0.1 M in NH3 and 0.1 M in NH4Cl. And calculate the change in PH when 6 ml of 0.1 M NaOH is added to the original buffer solution.

    asked by Mima on March 27, 2012
  77. Chemistry

    If l=1, what can you deduce about n? n=1 n>1 n>or equal to 1 nor equal to 3 l

    asked by Anonymous on October 29, 2012
  78. Chemistry

    How many grams of CO are needed to react with an excess of Fe2O3 to produce 209.7gFe? Fe2O3(s) + 3CO(g) => 3CO2(g) + 2Fe(s)

    asked by Shelly on May 17, 2012
  79. Chemistry

    If acetic acid is the only acid that vinegar contains [Ka = 1.8*10-5] , calculate the concentration of acetic acid in the vinegar. pH of vinegar is 3.20 _______________ First I got the antilog of the pH given, which turned out to be 6.309E-4. Then I did

    asked by Jonah on March 1, 2013
  80. Chemistry

    FeSCN2+ -> Fe3+ + SCN- Solution is initially dark red. If some Ag+ is added to form AgSCN. what happens to position of equilibrium? what happens ot the color?

    asked by Grace on February 8, 2011
  81. Chemistry

    Write the net ionic equation for the reaction that occurs when aqueous solutions of barium hydroxide and hydrobromic acid are combined. I know that the first part of the formula would be BaOH + HBr but I do not know what the product would be since HBr is

    asked by Hannah on October 9, 2011
  82. Chemistry

    Write a net ionic equation to show that quinoline, C9H7N, behaves as a Bronsted-Lowry base in water.

    asked by Leslie on April 17, 2013
  83. chemistry

    A 32.2 g iron rod, initially at 22.3 C, is submerged into an unknown mass of water at 63.9 C, in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 58.6 C. What is the mass of the water?

    asked by HELP on March 19, 2012
  84. Chemistry

    For a reaction between sodium phosphate and strontium nitrate write out the following: a) The balanced molecular equation b) The ionic equation c) The net ionic equation a) I think I have this one: 2 Na3PO4 (aq) + 3 Sr(NO3)2 (aq) --> 6 NaNO3 (aq) +

    asked by Donna on May 14, 2008
  85. Chemistry

    A gas is allowed to expand at constant temperature from a volume of 2.00 L to 11.20 L against an external pressure of 1.500 atm. If the gas loses 256 J of heat to the surroundings, what are the values of q, w, and ΔU? Pay careful attention to units.

    asked by Syed on October 9, 2012
  86. Chemistry

    For Mn3+, write an equation that shows how the cation acts as an acid.

    asked by Ari on February 12, 2011
  87. Chemistry

    Consider the following cell: Pt|H2(g, 0.460 atm)|H (aq, ? M)||Ag (aq, 1.00 M)|Ag(s) If the measured cell potential is 1.00 V at 25 °C and the standard reduction potential of the Ag /Ag half-reaction couple is 0.80 V, calculate the hydrogen ion

    asked by Daisy on March 19, 2012
  88. Chemistry

    4.00 mol of solid A was placed in a sealed 1.00-L container and allowed to decompose into gaseous B and C. The concentration of B steadily increased until it reached 1.20 M, where it remained constant. A(s) B(g)+C(g) Then, the container volume was doubled

    asked by Anon on February 5, 2013
  89. Chemistry

    Estimate the value of the equilibrium constant at 550 K for each of the following reactions. 1) 2CO(g) + O2(g) 2CO2(g) 2) 2H2S(g) 2H2(g) + S2(g) Thanks in advance!

    asked by Miguel on July 18, 2010
  90. Chemistry

    If you have 320.0 mL of water at 25.00 °C and add 110.0 mL of water at 95.00 °C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.

    asked by Ryan on October 18, 2011
  91. Chemistry

    A mixture of C3H8 and C2H2 has a mass of 2.3g . It is burned in excess O2 to form a mixture of water and carbon dioxide that contains 1.6 times as many moles of CO2 as of water. What is the mass of C2H2 in the original mixture?

    asked by Matt on October 19, 2013
  92. 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.) for 310K,1070,1470 this is what i

    asked by Ty on May 19, 2014
  93. chemistry

    A 15.27 g sample of Mo2O3(s) is converted completely to another molybdenum oxide by adding oxygen. The new oxide has a mass of 18.33 g. Add subscripts below to correctly identify the empirical formula of the new oxide.

    asked by anon on September 18, 2014
  94. chemistry

    Indicate the number of equivalents in each of the following: 4mol Mg2+ 0.1mol H+ 2mol Cl- 3mol Fe3+

    asked by Katherine on September 12, 2012
  95. Chemistry

    Can anyone help me with these three questions? Predict the sign of delta S° and then calculate delta S° for each of the following reactions a. 2H2S(g) + SO2(g) --> 3S(rhombic)(s) + 2H2O(g) b. 2SO3(g) --> 2SO2(g) +O2(g) c. Fe2O3(s) + 3H2(g) --> 2Fe(s) +

    asked by Anonymous on May 14, 2015
  96. Chemistry

    How many CO2 molecules would be formed from the reaction mixture that produces the greatest amount of products? 2CH3OH(g)+3O2(g)--->2CO2(g)+4H2O(g) 3-CH3OH & 3-O2 or 1-CH3OH & 6-O2 or 4-CH3OH & 2-O2

    asked by Jazmin on April 2, 2010
  97. Chemistry

    Identify any incorrect formulas. explain your answer. a. Mg2(SO4)3 b. Rb3As c. BeCl3 d. NaF

    asked by Minny on November 5, 2009
  98. Chemistry

    A solution containing a mixture of metal cations was treated with dilute HCl and no precipitate formed. Next, H2S was bubbled through the acidic solution. A precipitate formed and was filtered off. Then, the pH was raised to about 8 and H2S was again

    asked by Brunost on April 7, 2013
  99. Chemistry

    I just need someone to check over my answers, I'm pretty confident in all of them! In which six-membered hydrocarbon rings are all of the C-C-C angles roughly the same, i.e., within 1o? Select ALL that apply. Question 1 options: A)cyclohexane B)cyclohexene

    asked by Dan on December 9, 2015
  100. Chemistry

    Express the concentration of a 0.0510 M aqueous solution of fluoride, F-, in mass percentage and in parts per million. Assume the desnity of the solution is 1.00 g/mL Since, we're assuming the density I think that also means were assuming the volume.. but

    asked by Joy on February 19, 2012