jude

Most popular questions and responses by jude
  1. chemistry

    Hydrogen iodide decomposes according to the reaction 2HI(g)H2(g) + I2(g) A sealed 1.50 L container initially holds .00623 moles of H2, .00414 moles of I2, and .0244 moles of HI at 703K. When equilibrium constant is reached, the concentration of H2(g) is

    asked on September 29, 2015
  2. Math

    An oblique triangle is inscribed in a circle. If one side of the triangle having a length of 10 cm and the angle subtended to that side is 20. Determine the area of the circle.

    asked on May 11, 2017
  3. Chemistry

    Why would an alcohol/water mixure not freeze at constant temperature.

    asked on February 23, 2011
  4. Chemistry

    S2O82-(aq) + 2I-(aq) ----------> 2SO42-(aq) + I2(aq) (I) Rate = k [S2O82-]x [I-]y Rate1 = k [S2O82-]x [I-]y ƒ´ [S2O82ƒ{] Rate = ƒ{ƒn ------------- ƒ´ƒnt Experiment data Experiment: 0.20M NaI,0.20M NaCl, 0.010M Na2S2O3,2% Starch,0.20M K2SO4, 0.20 M

    asked on March 8, 2011
  5. Chemistry

    What is the concentration of Ni2+ in 0.0775M Ni(NO3)2 and 1.3981M NH3

    asked on April 17, 2011
  6. Chemistry

    The density of a solution of 3.69g KBr in 21.70g H2O is 1.11g/mL. What is the molarity of KBr in the solution.

    asked on October 10, 2010
  7. Chemistry

    When 24.0g og glucose(a nonelectrolyte) are dissolved in 500g of water, the solution has a freezing point of -0.47C. What is the molar mass of glucose according to yhe data?Kf of water is 1.86C/m.

    asked on October 10, 2010
  8. physics

    describe the force board experiment to show how to obtain the resultant of two non-parallel coplanar force acting at a point.four forces of magnitude 10N, 5N, 4N, AND 6N acts on an oblect in the direction north. West, east and south respectively.find the

    asked on July 27, 2011
  9. chemistry

    Consider the hypothetical elements X and Y. Suppose the enthalpy of formation for the compound XY is -336 kJ/mol, the bond energy for X2 is 414 kJ/mol, and the bond energy for Y2 is 159 kJ/mol. Estimate the XY bond energy in units of kJ/mol.

    asked on December 13, 2010
  10. math

    suppose you won a contest at the start of 5th grade that deposited $3000 in an account that pays 5% annual interest compounded continuously. how much will you have in the account when you enter high school 4 years later? round to nearest dollar how much

    asked on March 7, 2013
  11. math

    The perimeter of triangle RXA is 39, PX=49 and AP=9.Find RX and RA.

    asked on February 15, 2015
  12. Chemistry

    What is the mole fraction of methanol CH3OH, in the vapor phase from a solution consisting of a mixture of methanol and propanol CH3CH2CH2OH at 40celsius, if the total pressure above the solution is 131 torr? The vapor pressures of methanol and propanolare

    asked on April 23, 2011
  13. Chemistry

    Reposting since it wasn't clear in the previous post S2O82-(aq) + 2I-(aq) ----------> 2SO42-(aq) + I2(aq) (I) Rate = k [S2O82-]x [I-]y Rate1 = k [S2O82-]x [I-]y Experiment data Experiment: 0.20M NaI,0.20M NaCl, 0.010M Na2S2O3,2% Starch,0.20M K2SO4, 0.20 M

    asked on March 8, 2011
  14. algebra

    The sum of the three numbers in Arithmetic Progression is 33. If the numbers are increased by 2, 1, and 6 respectively the new numbers will be in Geometric progression. Find these numbers.

    asked on April 10, 2017
  15. Chemistry

    What is the mole fraction of benzene C6H6 in the VAPOR PHASE from a solution consisting of a mixture of benzene and n-hexame ch3(ch2)4ch3 at 27celsius, if the total pressure above the solution is 135.2 torr? The vapor pressures of benzene and n-hexame at

    asked on April 24, 2011
  16. Chemistry

    What is the vapor pressure in Torr above a solution prepared by mixing 66.73g of benzene C6H6 with 63.26g toluene C6H5CH3 at 20 Celsius. The vapor pressure of pure benzene and toluene at 20celsius are 75 and 22 torr respectively. These compounds form

    asked on April 23, 2011
  17. Chemistry

    The density of a solution of 3.69g KBr in 21.70g H2O is 1.11g/mL. What is the %w/v of KBr in the solution?

    asked on October 10, 2010
  18. Chemistry

    At 1473K the equilibrium constant for the reaction H2(g) + Cl2(g) 2HCl(g) Kc = 2.5*10^4. What would be the equilibrium concentration of HCL if the initial concentrations of H2 and Cl2 were 0.1840M and 0.1918M. I got 29.7 but was told it was wrong

    asked on March 12, 2011
  19. Chemistry

    How many grams of carbon tetrachloride CCL4 must be mixed with 35.96g of ethyl acetate CH3COOCH2CH3 at 50? celsius to produce a solution with a vapor pressure above the solution of 291.8 torr. The vapor pressure of pure carbon tetrachloride and ethyl

    asked on February 20, 2011
  20. Math

    A computer is reduced by 15% in a sale. The original price is £560. Calculate the sale price

    asked on November 5, 2015
  21. math help

    The perimeter of triangle RXA is 39, PX=49 and AP=9.Find RX and RA. I think it's under triangle bisector theorem. Help me answer this guys. Thanks.

    asked on February 15, 2015
  22. math

    Without adding, how do you know the sum of 36.179 and 8.63 will have a 9 in the thousandths place?

    asked on February 2, 2015
  23. College Chemistry

    A rock containing 238U and 206Pb was examined to determine its appropriate age. The molar ratio of 206Pb to 238U was 0.1462. Assuming no lead was originally present and that all lead formed remained in the rock. What is the age of the rock in years? The

    asked on May 5, 2011
  24. College Chemistry

    How many grams of Al would be deposited from an aqueous solution of Al3+ with a current of 1.430A after 5hrs of deposition.

    asked on May 3, 2011
  25. Chemistry

    A buffer was made by mixing 0.1522 moles of HCO2H with 0.1832 moles LiHCO2- and diluting to exactly 1L. What will be the pH after addition of 10ml of 0.3657M NaOH to 50mL of the buffer. Ka(HCO2H) = 1.8*10-4

    asked on April 16, 2011
  26. Chemistry

    Metal cations can act as lewis acids in water to produce an acidic solution even though the metal ion contains no hydrogen. Water hydrates the ions in solution and partial loss of electrons from water allows hydrogen ion to be lost What is the pH of a

    asked on April 16, 2011
  27. Chemistry

    What is the mole fraction of methyl n-butyrate CH3(Ch2)2COOCH3 in the vapor phase of a solution consisting of? a mixture of methyl n-butyrate and ethyl acetate CH3COOCH2CH3 at 50 Celsius if the total pressure above the solution is 192.5 torr. The vapor

    asked on February 20, 2011
  28. Chemistry! Please Help!

    What mass of propanoic acid, CH3CH2COOH, pKa= 4.87, should be dissolved in water to 2.00L volume in order to produce a pH of 2.50? THANKS! -J

    asked on February 12, 2009
  29. College Chemistry

    I think this should be easy but im stuck. Please help: Suppose a compound could point in any of two directions in the solid and still have the same energy. How many molecules would there be if the total entropy of a solid sample of this compound was

    asked on May 1, 2011
  30. Chemistry

    How many grams of glycerin C3H8O3 must be dissolved in 375.9g of water at 100 degrees Celsius to reduce the pressure of water above the solution to 714.6mmHg. The solution is a non-volatile compound

    asked on April 23, 2011
  31. Chemistry

    How many moles of NaOBr- must be mixed with 0.1788 mole of HOBr and diluted to 1L to prepare a solution having a pH of 8.7043. Ka of HOBr = 2.0 * 10-9

    asked on April 16, 2011
  32. Chemistry

    How much energy in KJ is release to form one mole of 123Sb from protons and neutrons if the atom has a mass of 122.90422 amu? Please remember to include the mass of electrons in calculations. Havent been taught this yet so a step by step walkthrough would

    asked on May 5, 2011
  33. Chemistry

    Suppose a compound could point in any of two directions in the solid and still have the same energy. How many molecules would there be if the total entropy of a solid sample of this compound was 8.174e-9J/K I used S= klnW and got lnW = 5.92e14. How do i

    asked on April 30, 2011
  34. Chemistry

    Calculate the[OH-] of a solution of 0.1861M CH3CH2CH2NH3CL if Kb= 5.1*10-4 for CH3CH2CH2NH2

    asked on April 16, 2011
  35. physics

    Given a square of sidelength a = 5 cm. We place a charged particle at each corner, three of them carry + 2 nC of charge and one carries the same amount of negative charge. What is the magnitude of the electric field at the center of the square? I don't

    asked on February 6, 2010
  36. Math

    You have $30 to spend on picking 25 pounds of two different types of fruit at a farm. The apples cost $1.40 per pound the blueberries cost $.90 per pound and the cherries cost $1.10 per pound. You want prices many pounds of apples as the other two fruits

    asked on April 10, 2016
  37. math help

    The perimeter of triangle RXA is 39, PX=4 and AP=9.Find RX and RA.  P is at the middle.  I think it's under triangle bisector theorem. Help me answer this guys. Thanks

    asked on February 18, 2015
  38. chemistry

    Can the half cell electrochemistry experiment using a pH meter and aqueous solutions of Cu, Cu2+ and Ag and Ag+ be used to measure even lower concentrations, such as 10^-23 mol of Cu2+ or a single free copper ion in solution? Please explain.

    asked on May 5, 2011
  39. College Chemistry

    If the voltage of the cell is -0.1288V at 25Celsius when [Pb2+]=0.1403M and the pressure of H2=1atm, what is the pH Pb(s)+2H+(aq) Pb2+(aq) +H2(g) E0 = 0.1260V

    asked on May 3, 2011
  40. Chemistry

    The free energy change for the dissolution of cuco3 at 25celsius is 56.246KJ/mol. What is the solubility of this compound. I used delta G/-RT = lnKsp but the answer i got was wrong.

    asked on April 30, 2011
  41. Chemistry

    The vapor pressure of pure water at 90celsius is normally 525.8 but decreased 483mmHg upon addition of an unknown amount of KNO3 to 286.9g H2O at this temperature. how many grams KNO3 were added. ASSUME COMPLETE DISSOCIATION OF SOLUTE. Tried all solutions

    asked on April 24, 2011
  42. Chemistry

    What must be the concentration of F- to just start precipitation of SrF2 from a solution which is 1.202*10-5M i Sr(NO3)2? Ksp = 2.900*10-9

    asked on April 17, 2011
  43. Chemistry

    I did an experiment using 20ml of 0.1M acetic acid and added 8ml of 0.1M NaOH. pH obtained after adding NaOH was 5.2. How do i calculate the mols of NaOH that reacted? mols of acetate formed, acetic acid initially present and acetic acid unreacted. Also

    asked on April 7, 2011
  44. physics

    In a hydrogen atom, if the radius of the orbit of the electron is doubled, then its energy will ... a)Decrease by a factor of 2 b)Remain the same c)Increase by a factor of 2 d)Actually, it is not possible for the radius of the orbit to double e)Increase or

    asked on April 4, 2010
  45. physics

    If i take the inverse of a value, what happens to its uncertainty? For example, if I have C +/- deltC and then i do 1/C. What happens to delta C? Thank you

    asked on March 22, 2010
  46. Chemistry!! Please Help!

    What mass of propanoic acid, CH3CH2COOH, pKa= 4.87, should be dissolved in water to 2.00L volume in order to produce a pH of 2.50? THANKS! -J

    asked on February 12, 2009
  47. Medical Transcription

    A fact was constricted, appropriate, congruent. Speech was coherent, normal rate, rhythm, and volume. Thought process was goal directed. No looseness of associations or flight of ideas. Thought content showed he denied auditory or visual hallucinations.

    asked on January 23, 2017
  48. MATHS

    The+sum+of+two+numbers+is+30+six+less+than+twice+the+smaller+number+is+equal+to+the+number+x+find+the+larger+number Please give me the answer

    asked on July 15, 2016
  49. Math help

    The perimeter of triangle RXA is 39, PX=49 and AP=9.Find RX and RA. P is at the middle. I think it's under triangle bisector theorem. Help me answer this guys. Thanks

    asked on February 18, 2015
  50. math

    write in words and in expanded form in two ways fractional and exponential 1.) 3.5968 2.)325.19217 3.)47.813

    asked on June 23, 2014
  51. math

    I am a decimal between 2 and 3. The digit in my thousandths place is the sum of the digits in my tenths and hundredths place. The digit in my tenths place is the difference of the digits in my thousandths and hundredths place. The digit in my hundreths

    asked on June 18, 2014
  52. Math

    In a group of quarters and nickels, there are four more nickels than quarters. How many nickels and quarters are the if the coins are worth $2.30? Plsmshow the solution, thanks

    asked on September 24, 2013
  53. Pre algebra

    A number multiplied by itself and then by itself again gives -1,000. What is the number? Please show the solution step by step

    asked on September 24, 2013
  54. Minoxidil

    So, I'm doing a research project for my chemistry class, and one of the parts that I have to answer is the chemical reaction of the substance that I'm researching. But there's a problem. I've searched every single website regarding minoxidil, but I cannot

    asked on May 28, 2012
  55. Chemistry

    What must be the concentration of F- to just start precipitation of SrF2 from a solution which is 1.202*10-5M i Sr(NO3)2? Ksp = 2.900*10-9

    asked on April 17, 2011
  56. Chemistry

    What is the solubility of Ca(OH)2 at a pH of 4.802 Ksp of Ca(OH)2 = 6.500*10-6

    asked on April 17, 2011
  57. Chemistry

    The vapor pressure of pure water at 85 celsius is normally 433.6 mmHg but decrease to 393.8mmHg upon addition? of an unknown amount of ammoniu chloride NH4Cl to 162.2g of water at this temperature. How many grams of ammonium chloride were added assuming

    asked on February 20, 2011
  58. Chemistry

    At what initial concentration would a solution of acetic acid (ka=1.8x10^-5) be 2% ionized? I am stuck. Thanks -J

    asked on February 12, 2009
  59. Chemistry!!

    At what initial concentration would a solution of acetic acid (ka=1.8x10^-5) be 2% ionized? THANKS! -J

    asked on February 12, 2009
  60. english

    who is the eponymous hero in the books written by kevin crossley-holland This site will tell you about the book trilogy and give you the name of the hero. http://en.wikipedia.org/wiki/The_Seeing_Stone

    asked on January 12, 2007
  61. Algebra

    a vendor sold 100 fresh chicken eggs. eight of them were sold at a profit of 30% while the rest were sold at a loss of 40%. what is the percentage gain or loss on the whole stock?

    asked on May 4, 2017
  62. ALGEBRA

    SOLVE FOR THE VARIABLE 9/2m - 6 = -3 1/2 + 4m nine halves m minus 6 = negative 3 and a half + 4m thank you

    asked on January 6, 2016
  63. physics

    the bob of a simple pendulum has a mass of 0.03kg.determine the weight of the bob

    asked on July 25, 2015
  64. math

    4% on 185000 is what?

    asked on February 22, 2015
  65. Math

    A certain bacteria doubles the number of its cells every 20 minutes. A scientist puts 50 Cells in a culture disk. How many cells will be in the culture disk in 2 hours?

    asked on September 24, 2013
  66. psychology

    need psy 302 help anybody out there?

    asked on August 27, 2013
  67. physics

    A roller coaster travels 101 ft at an angle of 56.8 above the horizontal. How far does it move horizontally?

    asked on September 14, 2012
  68. College Chemistry

    How much time in years (assume a 365 day yr) would it take for a 1.6678g sample of 239Np to decay to a mass of 0.8671g if it has a half life of 2.030*10^5s

    asked on May 5, 2011
  69. Chemistry

    What would Qc be if the volume of the container increased by a factor of 1.604 for this reaction SO2+Cl2 SO2CL2 kc = 12.821 at 373K

    asked on April 23, 2011
  70. Biology

    The trachea is ___________ to the lungs Toes are _______________to the shoulders Esophagus is _____________ to trachea Pinna is ______________ to tail Liver is ______________ to stomach Options are Anterior, Posterior, dorsal, ventral, lateral, median,

    asked on March 1, 2011
  71. Chemistry

    Which of the following will have the smallest freezing point depression? 0.1158 m NaF 0.1158 m Na2SO4 0.1158 m K2SO4 0.1158 m Fe(NO3)3

    asked on February 20, 2011
  72. physics

    Which is true as one gets closer to the center of the earth? a. The person’s weight increases b. The person’s weight decreases c. The person’s weight remains the same d. The person’s mass changes e. A new dimension is discovered

    asked on May 6, 2010
  73. physics

    An ultrasonic beam reflects off a tumor in an organ at an angle of 50 with a shift L = 7 cm. If the speed of the wave is 26 % less in the organ than in the medium above, determine the depth of the tumor below the organ's surface

    asked on March 29, 2010
  1. MATHS

    The denominator of a fraction exceedsby 3. If the numerator is decreased by 1 and the denominator is increased by 3, the value of the resulting fraction is 1/2. What is the denominator and numerator? Please give me the answer in detail form thanks

    posted on July 15, 2016
  2. area perimeter

    12 and 2 a= l x w 12 x2 = 24 perimeter add all sides 12+ 12 +2 +2 = 28

    posted on January 6, 2016
  3. math

    Sir steve help me answer my post please.

    posted on February 19, 2015
  4. math

    33/×=6/4 cross multiply 33×4=132 6××=6× 132÷6=22 22=×

    posted on November 24, 2014
  5. Chemistry

    v

    posted on August 8, 2014
  6. math

    (3x10)+(5x9)

    posted on June 23, 2014
  7. math

    456736

    posted on June 23, 2014
  8. math

    2.134

    posted on June 18, 2014
  9. math

    No we can' t divide 23 and 4

    posted on February 23, 2013
  10. 4th grade Math Help

    No because 23 divide equal 69

    posted on February 23, 2013
  11. Chemistry

    189 he?

    posted on February 18, 2013
  12. Chemistry

    Thank you so much DrBob222

    posted on May 6, 2011
  13. Chemistry

    Thank you so much DrBob222

    posted on May 6, 2011
  14. Chemistry

    Thank you so much DrBob222. You are the best

    posted on May 6, 2011
  15. College Chemistry

    I tried this but was told the answer was wrong.

    posted on May 6, 2011
  16. Chemistry

    Can anyone help me with this question? Thanks

    posted on May 6, 2011
  17. College Chemistry

    Thank you DrBob222

    posted on May 5, 2011
  18. College Chemistry

    W = 2ⁿ , where n = number of molecules lnW = n • ln2 = 5.921 × 10¹⁴ ⇒ n = 8.542 × 10¹⁴ molecules

    posted on May 1, 2011
  19. Chemistry

    I figured it out. Had to find the molar solubility so square root of Ksp. Thanks

    posted on April 30, 2011
  20. Chemistry

    Thank you DrBob222.

    posted on April 23, 2011
  21. Chemistry

    12.821*1.604

    posted on April 23, 2011
  22. Chemistry

    2.9*10-9/1.202*10-5 and find the square root of the number = 0.0155

    posted on April 17, 2011
  23. Chemistry

    2.9*10-9/1.202*10-5 and find the square root of the number = 0.0155

    posted on April 17, 2011
  24. Chemistry

    5.0*10^8= 0.0775/0.9331^6x x= 2.35e-10

    posted on April 17, 2011
  25. Chemistry

    ignore f's in the question

    posted on March 8, 2011