1. Physics grade 12

    Find the force of tension in the chain. Determine the force of compression in the support bar. Be sure to include a free body diagram as part of your solution. Now the only information given is a mass=20.4 kg and the angle 22 degrees. If anyone could help

    asked by anonymous on March 14, 2012
  2. CHEM

    A 3.5g sample of potassium chloride(KCl)is dissolved in 10mL of water.The resulting solution is the added to 60mL of a 0.5M CaCl2 soltion. Assuming that the volume are additive,calculate the molar concentration and %w/v of each ion present in final

    asked by RUBY on October 13, 2017
  3. chemistry

    What is the order that these four compounds would travel through a silica gel column during liquid chromatography? a) ethylene glycol, HOCH2CH2OH b) aqueous sodium chloride solution, NaCl (aq) c) propanol, CH3CH2CH2OH d) benzene, C6H6 (eluted first), ???,

    asked by mia on April 12, 2008
  4. Chemistry

    When 0.100 g of calcium oxide is added to 125 g of water at 23.6°C in a coffee cup calorimeter, this reaction occurs: CaO (s) + H2O(l) -> Ca(OH)2 (aq) ∆H = -81.9kJ/mol If the specific heat capacity of water is 4.184 J g-1 °C-1, what is the final

    asked by John on September 29, 2015
  5. Chemistry

    I'm clueless on this take-home quiz we have. Calculate the concentration of (Co3)2- in a solution made by dissolving 1 mole of Co2 in 1 L of water. The hydration equilibrium constant Kh of Co2 at 25C is 1.70x10-3, Ka1 of H2CO3=2.5x10^-4, and

    asked by Clarissa on November 23, 2008
  6. Chemistry(Please help)

    Calculate the pH of an aqueous solution of 0.15 M potassium carbonate. I know that pH = -log(H30+) but I am not sure how to start this problem. Chemistry(Please help) - DrBob222, Saturday, April 14, 2012 at 11:09pm Hydrolyze the CO3^2-. CO3^- + HOH ==>

    asked by Hannah on April 17, 2012
  7. chemistry

    Why is it important that the sequence of addition of reagents be followed? What could possibly go wrong when this is not followed? Reagents added: 1st: Fe3+ solution 2nd: 2.00 mL 10% NH2OH-HCl (hydroxylamine hydrochloride) 3rd: excess 0.20%

    asked by smiley on September 15, 2007
  8. Chemistry

    I need help working the problems, I don't know how I got the right answers Calculate each of the following quantities: (a) Grams of solute in 185.8 mL of 0.267 M calcium acetate (b) Molarity of 500. mL of solution containing 21.1g of potassium iodine (c)

    asked by Emily on September 29, 2009
  9. Chemistry

    Calculate the concentrations of all species in a 0.810 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4 x 10^-2 and Ka2 = 6.3 x 10^-8 I calculated SO32- = 0.8096 M, HSO3- = 3.58E-4, H2SO3 = 7.1E-13, OH- =

    asked by Katherine on April 21, 2012
  10. chemistry

    calculate the volume of 0.0321M NaOH that will be required to neutralize 25.00 mL of a 0.0399M hydrochloric acid solution. M1v1=m2v2 since were trying to find out the volume I would change the equation to m2 times V2 divided by M1 0.0399 X 0.025/0.0321

    asked by elizabeth on November 2, 2014
  11. Physics- springs

    Block A has a mass 1.00kg, and block B has a mass 3.00 kg. the blocks are forced together, compressing a spring S between them; then the system is released from rest on a level, frictionless surface. The spring which egligible mass, is not fastened to

    asked by David E. on April 25, 2012
  12. physics

    If the car has a mass of 0.4 kg, the ratio of height to width of the ramp is 13/125, the initial displacement is 1.9 m, and the change in momentum is 0.87 kg*m/s, how far will it coast back up the ramp before changing directions?

    asked by George on February 7, 2013
  13. English III

    I need help with this question, I tired to find answer in the book, but I could find any clue please can someone help me?? Mark Twain used the characters in this novel (The Adventures of Huckleberry Finn) to show his contempt for the romantic style of

    asked by Joey Holland on April 30, 2016
  14. business

    A data processing analyst for a research supplier finds that a preliminary computer run of survey results show that consumers love a client’s new product. The employee buys a large block of the client’s stock. Discuss the ethical ramifications of this

    asked by Anonymous on November 17, 2011
  15. Business Research

    A data processing analyst for a research supplier finds that a preliminary computer run of survey results show that consumers love a client’s new product. The employee buys a large block of the client’s stock. Discuss the ethical ramifications of this

    asked by Nikki on November 10, 2012
  16. Chemistry

    Write balanced net ionic equations for the precipitation reactions that occur when the following solutions are mixed. If no reaction occurs, write "no reaction" a) silver nitrate and lithium hydroxide b) ammonium sulfide and cobalt (II) bromide I'm

    asked by Kanade on April 24, 2018
  17. English / Grammar

    Asking for help in re-structuring and or grammar correct: W.E.B. Du Bois. Du Bois wrote this book in order to show readers the striving in the souls of black people. He wants readers to feel the hurt, accomplishments, and losses of blacks. “Will America

    asked by Tupac on March 7, 2018
  18. Identifying the Structure of Sentences

    Identify the structure of each of the following sentences as either simple, compound, complex, or compound-complex 1. If this offense is reported, he will receive a severe fine. 2. The apples, peaches, and pears are in the refrigerator.

    asked by Please check my answers on February 8, 2017
  19. math

    A farmer wants to construct a pen with 100 feet fencing. The pen will be divided into two areas. Find the dimensions of the big pen. You may use your calculator or the fact that the x-coordinate of the vertex of a parabola is x=-b/2a. I would like to show

    asked by dave on March 21, 2014
  20. closing off first quadrant

    You are planning to close off the corner of the first quadrant with a line segment 20 units long running from (a,0) to (0,b). Show that the area of the triangle enclosed by the segment is largest when a=b From applications of derivatives...this is really

    asked by Jen on November 18, 2006
  21. Maths

    Question(1):Show that the curve y=x^2-3x-5 passes through the point (5,5),(4,-1),(2,-7),(0,-5) and (-t,5) calculate the gradient at each pont. question(2):given a 5by5 matrices with determinant equal zero and the same determinant of its interior element

    asked by Edward on August 2, 2015
  22. History

    1. Which answer best explains how the Articles of Confederation addressed the question of creating a court system? The Articles established the trial-by-jury system for the first time in history. The Articles created state, regional, and national courts

    asked by Caitlyn - Please help on December 11, 2016
  23. Chemistry

    The elements 57 through 71 (Lanthanum and the Lanthanoids) all form Ln+3 ions in aqueous solution. These all have an electron configuration is [Xe]4fn, where n increases from zero to fourteen over the series from Lanthanum to Lutetium Select the two ions

    asked by Kaitlyn on February 1, 2016
  24. CHEM - PLS help!!

    What would the equation look like if you added bromine (Br) in the presence of CH2Cl2 (Dichloromethane) to cyclohexanol (C_6H_11 OH). Would the solution become saturated or not??? What would the colour change be...if any?? Would a precipitate be formed??

    asked by K on February 25, 2008
  25. chemistry

    can someone please help me with this? i've been stuck on this one forever... A solution is made by mixing 25.0 mL of toluene C6H5CH3d=0867gmL with 135.0 mL of benzene C6H6d=0874gmL. Assuming that the volumes add upon mixing, the molarity (M) and molality

    asked by Anonymous on October 4, 2010
  26. Chemistry

    Calculate the volume of 1.0 M copper(II) sulfate solution required to completely react with 1.0 g of Fe(s) according to this equation: 2 Fe(s) + 3 Cu^2+ (aq) --> 2 Fe^3+ (aq) + 3 Cu (s). the copper in the reactant has a charge of 2+ and the iron in the

    asked by Sabrina on March 5, 2013
  27. Chemistry

    What mass of silver chloride, AgCl will precipitate from a solution that contains 1.50 g of, calcium chloride, CaCl if an excess amount of silver nitrate is present? CaCl2 + 2AgNO3 --> 2AgCl+ Ca(NO3)2 I keep getting 5!but its wrong...right?

    asked by Deepa on January 23, 2013
  28. math

    graphing in the coordinate plane unit test 3. which ordered pair is not a solution of y= -12x - 3 a.(-3,33) ***** b.(8,-98) c.(-9,105) d.(3,-39) 4.not posted 5. find the three solutions of the equation y = 7x - 5 a.(3,-26),(-1,-12),(3,16)

    asked by Pug lover on April 24, 2018
  29. Chemistry

    Aspirin is a weak acid with a Ka of 3.0x10^-5. Find the pH of a solution by dissolving .65g of aspirin in water and diluting it to 50mL. You can use RCOOH to represent aspirin. Molecular weight of aspirin is 180g/mol

    asked by Jessica on November 26, 2011
  30. chemistry

    Carbonic acid, H2CO3, decomposes into water and a gas. Write the molecular equation for this decomposition. Remember to include the states of the reactants and products. Carbonic acid is an aqueous solution.

    asked by thad on January 9, 2013
  31. chemistry

    Calculate the solubility of Cacl2 in g/L based on the experiement. Given 650g of CaCl2 added to 1.0L and allowed to dissolve as much as possible. While the remaining solid CaCl2 is filtered out of the solution and found to have a mass of 5.509g. What is

    asked by Greg on June 6, 2012
  32. Chemistry

    Calculate the Bi^3+ at the following points on the titration of 25cm3 of 0.02M Bi^3+ solution with 0.02M of EDTA at pH=2. After the addition of: a. 10cm3 b. 24cm3 c. 25cm3 d.26cm3 e. 30cm3. (Given: stability constant = 10^27.5, and alpha = 10^15.5) Please

    asked by Tommy on June 10, 2013
  33. chemistry

    The UNBALANCED equation is: Zn + HCl –] ZnCl2 + H2 How many milliliters of a 0.48 M HCl solution are needed to react completely with 7.4 g of zinc to form zinc(II) chloride? Answer in units of mL. 7.4/100.84g*2 mol

    asked by Kiley on November 23, 2015
  34. math

    Janice needs to figure out her cell phone bill. She is charged a monthly flat fee of $45. She is also charged $0.25 per minute. How many minutes dis she use if her cellphone bill was $145. write an equation and solution

    asked by martese on January 4, 2015
  35. Algrebra II-please check my answer

    Determine the zeros of the function 7x^2 + 9x = 0 answers were: {-9/7} {-9/7,0} {o,9/7} {9/7} I think the answer is {-9/7,0} but I'm not positive when I worked it-If this is wrong please steer me into the correct calcs because then I don't what I'm doing

    asked by Sammy on January 14, 2011
  36. Chemistry

    An aqueous solution of volume, v1 cm3, contains a mass, mg,of a compound to be extracted. When shaken with v2 cm3 of an organic solvent, a certain proportion, x, of this compound dissolves. Derives an expression for x in terms of v1, v2 and the partition

    asked by Shariah on February 1, 2017
  37. Chemistry

    For the reaction NaOH + HCl---> H20 + NaCl where the mass of NaOH is 2g and the Volume of Hcl is 100ml with a concentration of 0.5 mol/l. The initial temp is 25 and the final is 35, what is the amount of energy absorbed by the solution?

    asked by Hyde on May 4, 2010
  38. chemistry

    If dissolving 2g of ionic salt causes 50ml of water in increase temp. by 15 degrees Celsius at constant pressure, what would be the change in temperature if 6g of the same ionic salt were used instead? Assume the volume of solution remains the same.

    asked by tommy on November 18, 2016
  39. Chemistry

    You are given an unknown solution that only contains one of the two listed cations. Describe a simple test to distinguish between aqueous solutions of the following cations. State the distinguishing outcomes of the test and the indication of which cation

    asked by Kendel on November 24, 2011
  40. Chemistry

    Calculate the freezing point of a solution of 3.46 g of a compound,X,in 160 g of benzene. When separate sample of X was vaporised, its density was found 3.27 g/L at 116 c and 773 torr. The freezing point of pure benzen is 5.45 c, and kf is 5 .12 c/m.

    asked by Ethio on October 30, 2011
  41. Chemistry

    A 15.00 ml sample of a standard solution containing 1 g of CaCO3/L required 8.45 ml of EDTA to fully complex the Ca present. Calculate the volume of EDTA stoichiometrically equivalent to 1.0 mg of CaCO3.' Sorry, forgot to write the entire question.

    asked by Anonymous on February 28, 2010
  42. chemistry

    pls help. A weak acid HA (pKa = 5.00) was titrated with 1.00 M KOH. The acid solution had a volume of 100.0 mL and a molarity of 0.100 M. Find the pH at the following volumes of base added and make a graph of pH versus Vb: Vb = 0, 1, 5, 9, 9.9, 10, 10.1,

    asked by Joycelyn on December 1, 2012
  43. Chemistry

    A solution is made by mixing 25.0 mL of toluene C6H5CH3 d=0867gmL with 135.0 mL of benzene C6H6 d=0874gmL . Assuming that the volumes add upon mixing, the molarity (M) and molality (m) of the toluene are how would i start this problem?

    asked by Riley on April 7, 2008
  44. chemistry

    can someone help me with this please? i've been stuck on this one forever... A solution is made by mixing 25.0 mL of toluene C6H5CH3d=0867gmL with 135.0 mL of benzene C6H6d=0874gmL. Assuming that the volumes add upon mixing, the molarity (M) and molality

    asked by Anonymous on October 4, 2010
  45. chem

    In your own words, describe how you would calculate the concentration of green pigment. Assume that your 1/100 solution had an Absorbance of 0.8 and that the extinction coefficient for the green pigment is = 20 mM-1cm-1. Remember the Beer Lambert

    asked by Linda on August 27, 2008
  46. Chemistry

    Calculate the pH of a 0.18 M solution of cyanide ion, CN- given the Ka (HCN) = 6.2 x 10^-10. I know how to calculate Ka and Kb values no problem, but I don't know which value to use in my calculations. Is it based on the conjugate base/acid formed or

    asked by Tim on December 2, 2015
  47. Chemistry

    Iron (II) ion is oxidized by hydrogen peroxide in acidic solution. H2O2(aq) + 2Fe2+(aq) + 2H+(aq) ---> 2Fe3+(aq) + 2H2O (l) the rate law is k[H2O2][Fe2+] what is the order with respect to each reactant ? what is the overall order

    asked by Lauren on February 17, 2008
  48. chemistry

    Phenylacetic acid (C6H5CH2COOH) is one of the substances that accumulates in the blood of people with phenylketonuria, an inherited disorder that can cause mental retardation or even death. A 0.021 M solution of C6H5CH2COOH has a pH of 2.99. Calculate the

    asked by hannah on March 4, 2013
  49. Chemistry

    I am working on a redox stoichiometry lab. I need to calculate the moles NaBO3*4H2O. Mass=1.0133g in 100mL solution In my experiment I used 9.98mL and titrated in with KMnO4. I'm really confused about how to calculate the moles. Thanks for any help!!!!

    asked by Sheena on March 17, 2012
  50. chemistry

    Acetylsalicyclic Acid, HC9H704, is the active component is aspirin. Two extra strength aspirin tablets, each containing 500 mg of acetylsalicylic acid, are dissolved in 325 ml of water. What is the pH of the solution? (Assume Ka=3.3x10^-4)

    asked by Symone on December 5, 2010
  51. Calculus please help

    please help I can not understand this. I need an implicit form answer for the general solution of differential equation dy/dx=2(e^x-e^-x)/y^2(e^x+e^-x)^4 with (y>0). I have separated the y^2 to the left hand side to become 1/3y^3 but have no idea how to

    asked by Brian on February 18, 2011
  52. Chemistry

    Determine the volume of 0.250 M KOH solution required to neutralize each of the following samples of sulfuric acid. The neutralization reaction is: H2SO4(aq) + 2KOH(aq) = K2SO49aq) + 2H2O(l) Find: 15 mL of 0.250 M H2SO4

    asked by Kelsey G on November 30, 2010
  53. mathematical

    Having mathematical standards in grades K-12 will give students clear and realistic expectations of what they are expected to learn in mathematics. The following solution explains this importance for students as well as the impact standards have on what

    asked by Anonymous on March 15, 2011
  54. history

    Which temporary solution was adopted in 1924 to address the economic problems caused by Germany’s inability to make reparations? Dawes Plan Young Plan Marshall Plan Versailles Plan the last one?

    asked by Dianni on November 20, 2018
  55. Precalculus

    I'm a little uneasy about this one, so I thought I'd ask someone who knows - [QUOTE] (5z^3w/-6m^3)*(-6m^5/25z^9) (OR) 5z^3 -6m^5 ------ * -------- -6m^3 25z^9 Perform the Operations and Simplify[/QUOTE] It's a Multiple Choice. a)wm^2/5z^5 b)wm^2/5z^6

    asked by Michael on May 1, 2008
  56. solid mensuration

    Find the area of a cyclic quadrilateral whose 2 sides measure 4 & 5 units, & whose diagonal coincides with a diameter of the circle. Suppose the radius of the circumscribing circle is 2 sq.root of 3 units. Please include solution. Thanks.

    asked by Cathy on December 1, 2012
  57. chemistry

    One purpose of adding KIO4 is to prevent the permanganate ion from being slowly reduced to Mn+2 by H2O. Write a balanced redox equation for the reduction of permanganate ion to Mn+2 by water in acid solution.

    asked by ella on February 23, 2012
  58. Math-Geometry

    I have to calcualte the volume of a cone. The height is 2.1 ft, and the base is 2 inches. I keep coming up with the answer of 8.792 cu ft. There is 4 choice answers given: 0.061 ft,0.610 ft,6.125 ft and 2.016 ft. I have tried several calculators, none of

    asked by Tammy on February 12, 2013
  59. Chemistry - Solubility Product

    What did you observe after the addition of dilute HCl to the saturated lead chloride solution? Explain observations using relevant chemical reaction. I observed that a white precipitate was formed. Not sure how to explain why it formed

    asked by PleaseHelp on March 29, 2014
  60. chemistry

    Under an O2 pressure of 1.00 atm, 28.31 mL of O2 dissolves in 1.00 L H2O at 25 degrees. Determine the molarity of O2 in an aqueous solution at equilibrium with air at normal atmospheric pressure. The volume percent of O2 in air is 20.80 \%. (Have no idea

    asked by david on February 20, 2010
  61. Chemistry

    10.0 g of an unknown acid is titrated to the equivalent point using 65.0 ml of 0.150M KCH. Assuming the acid is monoprotic ( like HCL or HF ) , what is the molecular mass of the acid? Is it possible to find the mols of the acid? (Balanced equation &

    asked by Gage on June 6, 2014
  62. chemistry

    Calculate the pH of each of the following strong acid solutions. 0.697 g of HClO3 in 2.97 L of solution. so i convenrted grams to moles then moles/L to get M of HCl03 then i did -log of that cocentration and put htat as the ph. did i do something wrong? i

    asked by hannah on March 2, 2013
  63. Chemistry

    What did you observe after the addition of dilute HCl to the saturated lead chloride solution? Explain observations using relevant chemical reaction. I observed that a white precipitate was formed. Not sure how to explain why it formed

    asked by PleaseHelp on March 29, 2014
  64. Chem

    Which of the following will be more soluble in an acidic solution than in pure water? SrSO4 CsClO4 CuCN Ni(OH)2 AgCl Please help explain why! I've tried submitting the ones that are insoluble in water and it was wrong. I know it has something to do with

    asked by Hana on May 2, 2013
  65. Chemistry

    84cubic centimeters of hydrogen chloride gas measured at s.t.p is dissolved in water and titrated with 0.15M sodium hydroxide.What volume of sodium hydroxide solution is required for complete neutralization?

    asked by Doris on September 23, 2016
  66. chemistry

    Under an O2 pressure of 1.00 atm, 28.31 mL of O2 dissolves in 1.00 L H2O at 25 degrees. Determine the molarity of O2 in an aqueous solution at equilibrium with air at normal atmospheric pressure. The volume percent of O2 in air is 20.80 \%. (Have no idea

    asked by david on February 20, 2010
  67. Trig

    the horizontal speed of an airplane is 183mph. the magnitude of the plane's velocity is 200mph. write an expression describing the angle the angle the plane is climbing my solution: cos-1 183/200 is this right

    asked by luckybee on January 8, 2012
  68. Chemistry

    10.0 g of an unknown acid is titrated to the equivalent point using 65.0 ml of 0.150M KCH. Assuming the acid is monoprotic ( like HCL or HF ) , what is the molecular mass of the acid? Is it possible to find the mols of the acid? (Balanced equation &

    asked by Gage on June 6, 2014
  69. World history

    Which temporary solution was adopted in 1924 to address the economic problems caused by Germany's inability to make reparations? A-Versailles plan B-Marshall plan C-Dawes plan D-young plan B?

    asked by John on July 13, 2018
  70. Chem

    A 175-g sample of water is saturated with KNO3 at 40ºC. What mass of KNO3 forms a precipitate if the solution is cooled to the freezing point of water? (Refer to the Solubility and Temperature graph.)

    asked by Marie on May 24, 2016
  71. Chemistry II

    What is the molar concentration of a solution produced by dissolving 1.234 g (NH4)2CrO4 in water and diluting to a total final volume of 300.0 ml? (mass of {NH4}2CrO4 is 152.03 g/mol).

    asked by Angela on September 3, 2013
  72. Chemistry

    Suppose u place a beaker containing a solution in a refrigerator , an hr later a white solid is found on thr bottom of thr beaker. What happened. Why? I think a precipitate formed, but can any1 explain briefly so i can understand better? Thanks

    asked by Mia on February 23, 2013
  73. Chemistry

    A solution is prepared by mixing 13.00 ml of .0021 M aqueous Hg2(NO3)2 with 25 ml of .015M HCL. Assme that volumes are additive. a) Will precipitation occur? b) Calculate [HG2 2+], [CL-], and [NO3] after equilibrium is established.

    asked by Anmol on April 8, 2010
  74. chemistry

    Calculate the pH of a 5.75×10-2 M solution of the weak acid HCN (make an approximate calculation assuming that initial concentration is equal to the equilibrium concentration). Round your answer to 3 significant digits. HCN = CN- + H+

    asked by HELP ASAP PLEASE on October 10, 2013
  75. Science

    A chemist notes that a solution turns blue when a chemical reaction takes place. Which of the following correctly describes the chemist's data? a) it is a qualitative observation. b) is is a quantitative observation. c) it is a prediction. d) it is a

    asked by Anonymous on September 6, 2013
  76. chemistry

    What is the freezing pint of 0.0091 m aqueous sodium phosphate, Na3PO4? Assume that sodium phosphate is a strong electrolyte and it functions ideally in solution. (express your answer in degrees Celsius)

    asked by shawn on September 14, 2010
  77. Algebra 1

    1. What is the excluded value for the rational expression x^2 - 4/3x - 6? A: ? 2. The trinomial x ^2 - 6x + c is a perfect-square trinomial. What is the value of c? A: 9 3. Find the positive solution of the equation x^2 + 5x - 4 = 0. Round your answer to

    asked by Victoria on June 10, 2014
  78. bio

    In word, Describe how you would calculate the concentration of green pigment. Assume that your 1/100 solution had an Abosrbance of 0.8 and that the extinction coefficient for the green pigment is e=2 mM^-1cm^-1. Remember the Beer Lambert Law.

    asked by Vivian on August 26, 2008
  79. CONTROL SYSTEM

    HELP,PLS HELP..I NEED ANSWER FOR ECEN 4413 AUTOMATIC CONTROL SYSTEMS SPRING 2005 MIDTERM EXAM..I CANNOT FIND ANSWERS IN THE INTERNET.PLS HELP IF YOU KNOW WHERE TO DOWNLOAD THE SOLUTION MANUAL..OR YOU KNOW THE ANSWER!!THANK YOU

    asked by HEEELLLLPP! on October 5, 2013
  80. chemistry

    A 32.5 g sample of K2SO4 is dissolved in a quantity of water and stirred well. A 40.00 mL sample of the solution is evaporated to dryness and leaves behind 5.00 g of solid K2SO4.what is the molarity. Calculate molar masses of solutes to .01 grams

    asked by mark on April 26, 2015
  81. chemistry

    What volume of hcl solution of density 1.2g/cm3 and containing 36.5% by weight hcl, must be allowed to react with zinc in order to liberate 4g of hydrogen The answer 333.3ml Who helps me step by step for me

    asked by ken on July 4, 2014
  82. General Chemistry

    Ferric Hydroxide, Fe(OH)3, is an insoluble salt with a solubility of 10^-39. 1) What is the maximum concentration of ferric hydroxide that can dissolve? 2) Using Le Chatalier's Principle, explain why iron (III) solutions are more soluble in acidic

    asked by Henry on May 20, 2016
  83. chemistry

    If there are 0.561 g of NaCl left in a beaker that originally contained 75.0 mL of saltwater, what must have been the molar concentration of the original solution? The molar mass of NaCl is 58.44 g/mol. Give your answer to 3 decimal places

    asked by Kaylin on September 10, 2014
  84. chem

    A solution is made by mixing 20.0 mL of toluene C6H5CH3d=0867gmL with 150.0 mL of benzene C6H6d=0874gmL. Assuming that the volumes add upon mixing, the molarity (M) and molality (m) of the toluene are ____M and _____m.

    asked by Chem help on August 14, 2008
  85. Chemistry

    if 225 mLs of .50 molars of hydrofloric (HF) acid solution is reacted with 25.5 grams of solid zinc what is the most (in grams) aqueous zinc flouride that would be produced? Based on this, how much nonlimiting ractants will be left over?

    asked by Nicole on March 14, 2011
  86. Science

    Chlorine gas was bubbled through a warm concentrated solution of potassium hydroxide. -write an equation of reaction that took place -describe how pure crystals potassium chlorate (5) may be obtained from the reaction above

    asked by Piom on July 30, 2011
  87. Physical science

    The engine of a car is being lifted out of the car by using a pulley system. The weight of the engine is 8000N. Use a scale diagram to determine the horizontal force, F1 that a mechanic has to use to hold the engine in such a position that the rope makes

    asked by Pamela on March 7, 2012
  88. Statistics

    the average length of time for students to register for fall classes at a certain college has been 50 minutes. a new registration procedure using modern computing machine is being tried. if a random sample of 12 students had an average registration time of

    asked by Jacy on March 10, 2011
  89. COM/155

    Use at least five adverbs and five adjectives to write a brief review of a movie, sporting event, musical performance, or television show. I wrote my movie review but im really confused on which ones are adjectives and which ones are adverbs. could you

    asked by Stephanie on February 20, 2011
  90. chemistry

    95.0mLmL of H2O\rm H_2O is initially at room temperature (22.0∘C\rm{} ^{\circ}C). A chilled steel rod at 2.0∘C\rm ^{\circ}C is placed in the water. If the final temperature of the system is 21.3∘C^{\circ}C, what is the mass of the steel bar? Specific

    asked by Anna on March 11, 2014
  91. algebra

    a disk jockey must play 14 commercial spots during one hour of radio show, each commercial is eiter 30 seconds or 60 seconds long. If the total commercial time during one hour is 11 minutes, then ow many 30 second commercials were played that hour?

    asked by Anonymous on May 9, 2011
  92. math

    andre wants to figur out his resting heart rate. he counted 7 heart beats in 6 secconds part A show the data as a fraction part B using the rate from part A calculate andres rate of heartbeats per minute

    asked by marquis on March 19, 2008
  93. Math

    An airline believes that the probability of a passenger being a no-show on a morning flight is 12%. If the airline overbooks a 300 seat morning flight by selling 350 tickets how many empty seats should the airline expect to have on the flight

    asked by Nancy on September 7, 2016
  94. mathematical physics

    Show that the angular momentum vector(L)=vector(r)×vector(p) vector is an axial vector

    asked by gourav on March 21, 2015
  95. value

    show that the sum of nterm of the progression is logx,logx^2,logx^3,logx^4---is n(n+1)/2 logx

    asked by value on February 20, 2017
  96. Biology

    Hi, I am trying to work out a hypothesis to compare Estrogen receptors in breast cancer cells to normal breast tissues. Am I right in thinking that this will be a hypothesis using "effect" words instead of association ?

    asked by Yvonne on April 1, 2017
  97. Biochem again

    Thanks for answering the first one :) Here is another Calculate the amount of sodium acetate and acetic acid necessary to make 100mL of a 0.500 M acetate buffer that is pH 5.2. I believe I have the answer but I want to make sure I did the work correctly.

    asked by bugbabe623 on September 11, 2008
  98. Physic Help

    Charge is uniformly distributed along the x axis with density ß. Use Gauss' Law to find the electric field it produces, and use this to calculate the work done on a charge Q that moves along the y axis from y = a to y = b.

    asked by Lindsey on February 18, 2013
  99. physics

    A Carnot engine operates between 170°C and 20°C. How much ice can the engine melt from its exhaust after it has done 6.0 104 J of work? i need a step by step process. you don't have to give me the answer.

    asked by Nate on September 29, 2010
  100. Math

    Use the graph below to answer the following question. I'll post the link to the graph below. Find the slope. A. 2 B. -1/2 C. -2 D. 1/2 Honestly I'm horrible at Math so I can't really pick a answer can someone please help me? Please explain to me how to

    asked by Amber on April 28, 2015

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