1. chemistry

    the average molar mass of polyethylene when 4.40 g of the polymer is dissolved in benzene to produce 200.0 mL of solution and the osmotic pressure is found to be ...

    asked by Anonymous on April 2, 2012
  2. Chemistry

    Which of the following factors affect the solubitity? a)temperature of the solutions b)polarity of the solvent vs solute molecules c)partial pressure of the gas above the solution d) all of the above

    asked by James on December 14, 2014
  3. Chemistry

    Calculate the pH of a solution that is made by mixing 10.00 mL of 0.2500 M HCl with 35.00 mL of .1500 M HNO3 and diluting the mixture to a total volume of 100.00 mL

    asked by Dan on May 5, 2011
  4. Chemistry

    Calculate the mass of solid which would be precipitated when 35g of carbon 4 oxide are passed through a solution of calcium hydroxide Show your work

    asked by Mike on August 13, 2016
  5. Chemistry (really need quick help)

    Balance the following equations. (Use the lowest possible coefficients. These may be zero.) (a) As(s) + ClO3-(aq) ---> H3AsO3(aq) + HClO(aq) (acidic solution) I am using half-reactions but I don't really get this at all. Can someone explain?

    asked by Samantha on May 5, 2011
  6. ORGANIG CHEMISTRY

    SUPPOSE .1g OF A AND 1.0ml WATER WERE MIXED AND HEATED TO 80 DEGREE CELCEOUS.WOULD ALL THE SOLID DISOLVED.AND IF THE SOLUTION IS COOLED AT WHAT TEMPARATURE CRYSTALS WILL APPEAR.

    asked by SAMIRA on February 10, 2012
  7. Chem- Bronsted bases

    Which of the following substances can act as a Bronsted base in aqueous solution? (Select all that apply.) H2O NH3 H2 CH3NH2 O2 PH41+ CO32-

    asked by Elizabeth on February 23, 2014
  8. chemistry

    Calculate the concentration in parts per million (ppm) of the solute in each of the following aqueous solutions (a) 0.00500 g of sodium chloride in 850 mL of solution

    asked by katiy on April 26, 2012
  9. Chemistry

    If 0.500 mol of each of the following solutes is dissolved in 2.0 L of water, which will cause the greatest increase in the boiling point of the solution? A. KI B. CO2 C. Na2SO4 D. NaCl

    asked by SahDuuude on August 8, 2016
  10. Chemistry

    I hae a solution that contains 30 lbs of sugar in 2.5 gallons of water. Calculate the mass percent, molarity, molality and mole fraction.

    asked by Pam on October 27, 2011
  11. Business & Technology

    1. When a hurricand, flood, or pandemic strikes a country, who is most likely to respond. 2. Which economic system is the best solution for handling a crisis of epic proportion?

    asked by Deb on May 5, 2011
  12. Chemistry

    Calculate the number of milliliters of 0.782 M KOH required to precipitate all of the Mn2+ ions in 112 mL of 0.461 M Mn(NO3)2 solution as Mn(OH)2.

    asked by Jessica on October 16, 2014
  13. Chemisty

    25.0 mL of 0.250 M MgCl is transferred to a 300.0 mL volumetric flask and diluted to the mark with deionized water. What is the concentration of the dilute solution?

    asked by Wyatt on April 10, 2012
  14. Chemistry

    If 0.500 mol of each of the following solutes is dissolved in 2.0 L of water, which will cause the greatest increase in the boiling point of the solution? A. KI B. CO2 C. Na2SO4 D. NaCl

    asked by OTP on August 8, 2016
  15. chemistry

    Calculate the concentrations of all species in a 1.22 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10–2 M and Ka2 = 6.3× 10–8 M.

    asked by anon on October 30, 2014
  16. Chemistry

    Determine the mass, in grams, of water contained in 0.25 litres of aqueous solution that has 10% dissolved salt and density equal to 1.10 g/cm3

    asked by Monica on April 27, 2016
  17. Chemistry

    I'm not sure how to do this one At 22 °C an excess amount of a generic metal hydroxide M(OH)2 is mixed with pure water. The resulting equilibrium solution has a pH of 10.26. What is the Ksp of the salt at 22 °C? Please help thank you!

    asked by Jeffery on March 29, 2019
  18. math

    can someone correct this for me. If the company shipped a total of 550 items last month, how many were shipped using second-day airfreight? (If second day freight is 40%,Next day frieght is 15%,and Truck is 45%) My answer: 550 items shipped – 40% second

    asked by jasmine20 on December 22, 2006
  19. College Algebra

    Please Explain your reasoning Part 1: Suppose that the number of new homes built, H, in a city over a period of time, t, is graphed on a rectangular coordinate system where time is on the horizontal axis. Suppose that the number of homes built can be

    asked by Vision/Help! on November 3, 2007
  20. math

    Two cell phone companies have different rate plans.Runfast has monthly charges $25 plus $10 per gig of data.B A&D’s monthly charge is $18 plus 15 per gig of data. Your task is to determine under what circumstances each company has the better pricing. You

    asked by Help please on April 22, 2016
  21. Algebra II

    Write the simplest polynomial function with the zeros 2-i, square root of 5, and -2. I know that the conjugates are 2+i and -the square root of five, but when I multiply it comes out wrong. not sure A toy rocket is launched from the ground level with an

    asked by K. on April 10, 2007
  22. chemistry

    Hydrazine has the molecular formula N2H4 and is a volatile colourless liquid often used in industrial processes and as a rocket fuel. It has a single N–N bond in its structural formula. When hydrazine is heated it produces ammonia (NH3) and nitrogen (N2)

    asked by rebecca niles on January 25, 2011
  23. Psychology

    Hi Jiskha Instructors, I am having a real difficult time finding answers to my five questions. Is there someone who can help point me in the right direction to credible or reputable website sources? Or answer these five questions. I need a credible

    asked by Sharon on November 13, 2011
  24. geometry/trig

    Initially a fifty foot ladder rests against a wall. As I start to climb it, the ladder slides down, finally stopping such that the ladder touches the wall at a point 8 feet below where it originally touched the wall. During the slide, the base of the

    asked by eman on April 15, 2015
  25. Algebra

    Question: Looking below is this answer correct? If you follow the math, you reach the entire population before 8 hours have passed yet the solution says 8.86 hours.... Is the solution giving us the numbers in the set and not the actual elapsed hours???

    asked by Chris on November 30, 2010
  26. algebra!

    If the measure of angle A is doubled and then decreased by 10 while the complement of angle A is decreased by one-third of itself, then these two anlges formed are still complementary. Find the supplement of angle A. Please explain so i could understand.

    asked by Kelly on August 31, 2006
  27. Math

    Write the rule for each function. Write the rule as an equation. Input x 1 2 3 4 5 6 Output y 6 7 8 9 10 11 Rule: _________________________________________________. Input x 1 2 3 4 5 6 Output y 5 8 11 14 17 20 Rule:

    asked by Suzanna on December 11, 2017
  28. Chemistry

    Methanol, CH3OH, is produced on an industrial scale from carbon monoxide and hydrogen. At the temperatures used, gaseous methanol is formed according to the following thermochemical equation: CO(g)+ 2H2(g) CH3OH(g) £H = -90Kj 1. State Le Chateliers

    asked by Adam on March 2, 2007
  29. Algebra

    Can someone please explain how to do these problems. 1)write a polynomial function of least degree with intregal coefficients whose zeros include 4 and 2i. 2)list all of the possible rational zeros of f(x)= 3x^3-2x^2+7x+6. 3)Find all of the rational zeros

    asked by Marissa on August 10, 2007
  30. math

    1.How many grams of carbon monoxide are needed to react with an excess of iron (III) oxide to produce 198.5 grams of iron? Fe2O3(s) + 3CO(g) ----- 3CO2(g) + 2Fe(s) Show all work! 2.Hydrogen gas can be made by reacting methane (CH4) with high temperature

    asked by Anonymous on November 27, 2018
  31. Math

    How would I be able to determine if one of these is linear and non proportional? Select the best description of a real world situation where the relationship is linear and non-proportional. Amanda borrows a flute from a friend for $5 per week and then pays

    asked by Patrick on September 26, 2018
  32. Social Studies

    The most likely reason why an ancient Greek might worship more than one god is that ______________. A. Each god offered different help in areas of life B. he or she wasn't sure which of the gods were real C. the popularity of gods changed over time D. he

    asked by Nikki on December 12, 2018
  33. english

    1. Why do the sorceresses agree to kill Sunjata? (1 point) Sunjata declined his father's cows. Sunjata had befriended Jelimusoni Tunku Manyan Diawara. Dankaran Tuman's offer was better than Sunjata's. Dankaran Tuman had promised them a bull. 2. Why do the

    asked by Anonymous on November 19, 2012
  34. Psychology

    Brief summary and example of these Cognitive Learning Strategies/types please? I don't have my book yet and I need these ASAP!!!!! Ex: Three-stage information processing model is which includes a short definition or description of (a) sensory-register, (b)

    asked by Williams on May 25, 2014
  35. Math:)

    1. Simplify the expression. [csc^2(x-1)]/[1+sin x] a. csc x+1 b. csc x(csc x-1) c. sin^2 x-csc x**** d. csc^2 x-cos xtan x 2. Which of the following expressions can be used to complete the equation below? sec x/1+cot^2 x a. tan x b. tan^2 x c. tan x cos x

    asked by Girly Girl on March 21, 2018
  36. Math

    1)The break-even point is the ticket price for which the event's income will equal expenses. Another way to think of the break even point is the ticket price when profit is $0. The equations given in an earlier problem were: P=((4000-25X)x)-7500

    asked by Savannah on September 5, 2012
  37. English

    I urgently need you to check this part for me. Thank you very much for your cooperation. 1) I go on the internet every day to conduct research on various school subjects. I normally go on google as a search engine to find answers to my homework. 2) I

    asked by Henry2 on January 24, 2012
  38. math

    Two cell phone companies have different rate plans.Runfast has monthly charges $25 plus $10 per gig of data.B A&D’s monthly charge is $18 plus 15 per gig of data. Your task is to determine under what circumstances each company has the better pricing. You

    asked by abstract on April 22, 2016
  39. Macro economics

    5. The problem of determining what goods and services society should produce: A.exists because we can produce more than we need or want. B.exists because there are not enough resources to provide all the goods and services that people want to purchase.

    asked by Johnny on June 17, 2009
  40. Algebra. Please help me understand.

    24. You use a line of best fit for a set of data to make a prediction about an unknown value. The correlation coefficient for your data set is -0.015. How confident can you be that your predicted value will be reasonably close to the actual value? 25. A

    asked by LadyPhantomhive on December 10, 2015
  41. Chemistry(Please check)

    1) Which statement below is correct (true)? a) Since HNO2 is a stronger acid than HF it must have a greater pKa. b) Since HOCℓ is a stronger acid than HCN, then OCℓ– is a stronger base than CN–. c) The dissociation (or ionization) of HOCℓ in

    asked by Hannah on March 24, 2012
  42. Chemistry

    Molar volume of an ideal gas at S.A.T.P. (25oC and 1.00 bar is 24.8 dm3 mol-1. Assume that gases are at 225oC and P=1.00 atmosphere before and after the combustion and behave as ideal gases. The chemical equation for the combustion of butane is: 2C4H10(g)

    asked by JRMM on February 10, 2012
  43. organic chemistry

    Partition (distribution) coefficient, k, of benzyl alcohol in hexane and water is 12.0. Choose for the correct equation for the amount of benzyl alcohol as x that you should use to calculate the amount of benzyl alcohol extracted with one 10mL portion of

    asked by Jenn on November 25, 2008
  44. physics

    If 80% of a piece of wood is submerged in water before oil is added, find the fraction submjerged when oil with a density of 781 kg/m^3 covers the block. (Don't neglect the buoyant force of air before the oil is added). I thought to find the density of

    asked by tmaria on June 19, 2007
  45. Engish

    Need to circle the correctword in parentheses and label adjective or adverb. 1. Cats can see (good,well) in the dark. ANSWER=well,adverb 2.After the storm the pier was damaged(bad,badly). ANSWER=bad,adjective 3. I was (real,really) pleased to get your

    asked by Emily on May 3, 2011
  46. microeconomics

    The Consumer Price Index (CPI) for the year 2012 is 2.412 and the retail price per bushel for corn is $US12.06. Using 1992 as the base year (I.e CPI is 100) by how much would the real price for corn have risen or fallen if the retail price for corn in 1992

    asked by nando on April 28, 2013
  47. graph

    can someone SHOW me how to solve these graphs?2x > -6 and x - 4 < 3 x + 5 > 2x + 1 and -4x < -8 -6 < x + 3 < 6 (Remember this is an "and" statement) -3x < -6 or x + 5 < -2 x - 2 > 2x + 1 or -10 > -2x - 2 Look at the third. -6 < x + 3 < 6 (Remember this is

    asked by mike on June 29, 2007
  48. CHEMISTRY

    Someone please tell me if I'm doing this right... It's due tonight!! Dr. Bob222, Yesterday I posted a question and you answered me with how to calculate it.. Can you tell me if I'm doing this correctly?? Please! Consider the following chemical equation:

    asked by Jennie on February 25, 2015
  49. Chemisty

    Someone please tell me if I'm doing this right... It's due tonight!! Dr. Bob222, Yesterday I posted a question and you answered me with how to calculate it.. Can you tell me if I'm doing this correctly?? Please! Consider the following chemical equation:

    asked by Jennie on February 25, 2015
  50. Chemistry

    Expt #1- Molecular Weight of Unknown Acid Unknown Acid: #2 Mass of Unknown solid acid transferred:0.414g Volume of volumetric flask: 100.00 mL Concentration of NaOH: 0.0989 M Aliqot of acid titrated with NaOH: 25.00 mL Average volume of Naoh from

    asked by Rayana on October 10, 2010
  51. algebra

    Okay, how do you factor a polynomial when there is a number in front of the highest x term. For example: how would you factor 2x^2-11x+15 i know the answer is (2x-5)(x-3), right? So you put the 2x on one side and then you put an x on the other. And then

    asked by Fidelia on May 15, 2007
  52. International Trade

    Krugman and Obstfeld make sure to challenge three commonly held “misconceptions about comparative advantage”. They make their arguments intuitively and with little discussion of relative prices. Expand on the challenge to these three “myths”. Use

    asked by Deena on November 5, 2008
  53. Physics

    A proton, moving in negative y-direction in a magnetic field , experiences a force of magnitude F, acting in the negative x direction. a) What is the direction of the magnetic field producing force? b) Does your answer change if the word proton is replaced

    asked by Jessica on October 25, 2011
  54. Chemistry***

    A mixture containing 19.8 moles of H2 and 7.2 mole of I2 was allowed to reach equilibrium in a 5 L closed vessel at ToC according to the equation: H2 (g) + I2 (g) 2HI (g) At equilibrium, 14 moles of H2 was present. The equilibrium constant for this

    asked by plasma membrane on December 30, 2014
  55. math

    i have a big math quiz today on these terms plz help me meaning of a ratio that compares two quantities measured in different units meaning of the rate for one unit of a given quantity meaning of found by multiplying the denominator of one ratio by the

    asked by Gaganjyot Bhatti on November 16, 2016
  56. can someone edit my body paragraph thanks :

    can someone edit my body paragraph thanks : The senate has important jobs that not many people know about. One of them is to disapprove or approve any piece of government legislation; with the help of the House of Commons. As well the senates investigate

    asked by Anonymous on April 23, 2007
  57. math

    Certain private water utilities in South Carolina charge a variable rate for the drinking water they provide to residences. One customer's bills over a 23-month period were used to fit a linear regression in an attempt to predict charges on future bills

    asked by anon on October 3, 2017
  58. math ,hep, plz

    can someone help explain this for me please... Problem #1 What values for x must be excluded in the following fraction? (x+5)/(-1) Problem #2 what values for x must be excluded in the following fraction? (x-3)/((4x-5)(x+10)) When working with fractions,

    asked by jasort20 on March 18, 2007
  59. Business Law

    I'm having trouble figuring out this question. I can't think of a legal theory that would apply in this case. If anyone could help me out, that would be great! Fidelity Mortgage sells a mortgage on Doug Quicksilver's home to Enterprise Bank. Enterprise

    asked by Courtney on March 29, 2011
  60. econ-exchange rate

    E=exchange rate, H=Home, F=foreign Usually exchange rate are expressed in units of home currency per units of foreign currency. (E H/F) But why for the real exchange rate, it is q F/H ? This is really confusing.

    asked by econ on May 31, 2008
  61. college chemistry

    Dry ice is solid carbon dioxide. Instead of melting, solid carbon dioxide sublimes according to the following equation: CO2(s)--> CO2(g). When dry ice is added to warm water, heat from the water causes the dry ice to sublime more quickly. The evaporating

    asked by Eddie on November 9, 2009
  62. science

    1. which of the following is true about phtosynthesis? a. it is an exothermic reaction b. it is an endothermic reaction c. it produces carbon dioxide* d. it occurs in animals 2. atomic theory is a. subject to change if new information is discovered b. a

    asked by seuljin on November 2, 2018
  63. Physics please check

    A rotating door is made from four rectangular glass panes, as shown in the drawing. The mass of each pane is 88 kg. A person pushes on the outer edge of one pane with a force of F = 53 N that is directed perpendicular to the pane. Determine the magnitude

    asked by Jim on March 26, 2007
  64. Chemistry

    Could someone please tell me if I did this question right? An incomplete reaction of 12.125 grams of propane proceeds as follows. 2C3H8+11O2 --> 3CO2+4H2O+2CO+C(s) How many grams of solid carbon residue are produced as a product? My answer: Step 1)

    asked by Adam on October 17, 2009
  65. math

    Confused! So here is the question: Inflation is currently causing the cost of items to increase by about 2.5% per year. In 2009 a litre of gasoline costs approximately $0.90. What will it cost to fill a 60 litre gas tank 10 years from now. Round your

    asked by Daniel on April 7, 2013
  66. Chem -plz check work

    so i've worked on this some more, now I am asking if someone will plz check my work 2 half cells in a galvanic cell consist of one iron Fe(s) electorde in a solution of iron (II) sulphate FeSO4(aq)and a silver Ag(s) electrode in a silver nitrate solution,

    asked by Sarah H on June 3, 2008
  67. physics

    I have to figure out if the following are true or false in order to solve an equation. But I am getting at least two wrong so I can't get the next one right. A)If you increase the tension in a string, the frequency of its fundamental vibration will get

    asked by Student in Need on March 31, 2011
  68. Calculus

    Consider a differentiable function f having domain all positive real numbers, and for which it is known that f'(x)=(4-x)x^-3 for x>0. A. Find the x-coordinate of the critical point of f. Determine whether the point is a relative maximum, a relative

    asked by Sarah on May 7, 2015
  69. calculus

    Consider the function f(x) = e^sin(cos(x)) on the interval [0, 4π] a) The critical points of f are at__________? [Hint: The range of the function cos(x) is [−1, 1]. What is the range of the function cos(cos(x))?] b) Local maxima are at ________? Local

    asked by Kevin Land on November 7, 2016
  70. Chemistry

    I'm not really sure how to do this. I've tried many ways and I can't get the right answer of 0.0569 mol/L H3PO4 100.0 mL of a solution containing 2.55g of potassium hydroxide is mixed with 100.0 mL of a 1.50 mol/L phosphoric acid solution. Will the

    asked by Sarah on December 17, 2017
  71. Physics

    A rocker acceleratess up ar 5m/s/s for 10s and at which point the fuel is exhusted, and then the rocket continues upwards in free fall. a)How high does the rocket riseb)What total time does the rocket spend in the air? b) What total time does the rocket

    asked by Billie on September 19, 2006
  72. acc 205

    Caren Smith opened a medical practice. During July, the first month of operation, the business, titled Caren Smith, M.D., experienced the following events: Jul 6 Smith invested $55,000 in the business by opening a bank account in the name of C. Smith, M.D.

    asked by Marion on July 7, 2011
  73. Economics

    A monopoly firm faces a demand curve given by the following equation: P = $500 − 10Q, where Q equals quantity sold per day. Its marginal cost curve is MC = $100 per day. Assume that the firm faces no fixed cost. You may wish to arrive at the answers

    asked by Bob on May 3, 2016
  74. Chemistry HELP!!!

    Only one question, it would be greatly appreciated if you would help me Thanx In an experiment, Na2CO3(aq) was added to 25.0 mL of CaCl2(aq) solution until no more precipitate was formed. The mass of precipitate produced was 2.50 g. Some statements about

    asked by Brittany Rusk on September 28, 2006
  75. economy

    Can you please help me solve the first problem of Working with the Data in Chapter 4 (page 136 #1) of Macroeconomics Fifth Edition by Stephen D. Williamson? I need all the steps of how to solve the problem 1. The employment-population ratio, from the

    asked by boby on March 23, 2016
  76. engineerig science

    I have to make a power point on fiber optic cable i need links on how to make fiber optics cable actually the real question is what engineers might do in companines that produce fiber optics cable. To answer the question, I would have to explain the steps

    asked by julie on November 18, 2007
  77. chemistry,

    in analyzing household bleach. I have a flask that contains 10.00 mL diluted bleach + 0.4g KI + 20 mL distilled water and 20 drops of 2M HCl. To that I titrated 30.60 mL Na2S2O3 and I need to calculate the number of moles of NaOCl reacted. This is what I

    asked by amy on April 10, 2007
  78. chemistry

    Determine the pH (to two decimal places) of a solution prepared by adding 395 mL of 0.0360 M benzoic acid (C6H5COOH) to 12.5 g of sodium benzoate (NaC6H5COO).

    asked by fati on November 29, 2014
  79. Trigonometry

    a pizza has a diameter of 18 inches and it's divided into 8 equal parts, and you take one slice of it. what is tha central angle of your share in mills measurements? with a solution

    asked by Jen on September 12, 2015
  80. Linear Algebra

    Use Gauss Jordan Elimination to write the solution of the system of equations: x1+4x2+2x3=17 3x1+x2-5x3=7 2x1-3x2-7x3=-10

    asked by Sharon on March 15, 2014
  81. chem 2

    For 520.0mL of a buffer solution that is 0.140M in HC2H3O2 and 0.125M in NaC2H3O2, calculate the initial pH and the final pH after adding 0.020mol of HCl

    asked by jess on April 23, 2015
  82. algbera

    Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. 2x + 10y = 58 -14x + 8y = 140

    asked by kozy on May 1, 2011
  83. Chem help

    Calculate the volume of H2 gas (25 Celsius and 760 mm Hg) that will collect at the cathode when an aqueous solution of Na2SO4 is electrolytes for 90 minutes with a 12amp current.

    asked by polo on October 30, 2018
  84. Chemistry

    Calculate the mole fraction of fructose (molar mass = 180.2g/mol) in an aqueous solution that has a freezing point of -7.0 degrees Celsius.

    asked by bm12 on September 1, 2018
  85. Chemistry

    Calculate the volume of oxygen starndad temperature and pressure which theoretically could be obtained from the 50cm3 of the solution of hydrogen peroxide containing 68g/dm3

    asked by Adulkarim on March 20, 2013
  86. chem

    calculate the pH in a solution prepared by dissolving .10 mol of solid NH4Cl in .500 L of .40 M NH3. Assuming no volume change. Without the use of Henderson-hasselbalch

    asked by Anisha on April 1, 2014
  87. chemistry

    The freezing-point depression is -0.930 Celsius degree. Determine the molality of the solution of an unknown nonelectrolyte in water. Please help!! I do not understand this problem!

    asked by vivian on February 7, 2012
  88. Chemistry

    Assume that it is necessary to determine the [Fe3+] in a solution that may be in the .0001 to .0005 M range. Outline a spectrophotometric method that would accurately give the required data?

    asked by Kirsten on March 10, 2011
  89. Chemistry

    Calculate the amount of Na2HPO4*7H2O in grams needed to make 50 mL of a 0.40 M solution. I think this is dealing with molarity but i cant figure it all out for some reason? Help would be greatly appreciated.

    asked by Bruce on March 11, 2012
  90. Chemisty

    (I am a mom trying to help my child had Chem years ago if I can see how this is doNE I can explain it to them) You have 70.0mL of a .400M stock solution that must be diluted to .100M. How much water should I add?

    asked by Kristina on July 18, 2015
  91. Chemistry

    Determine the equilibrium constant for a 0.10M phenol (HC6H5O) solution that has a pH of 5.43 at 25 degrees C. What is the degree of ionization of this weak acid? Why is the pH value important for this problem?

    asked by sea lively on July 22, 2018
  92. math

    system of equations can result in 3 possibilities: consistent, inconsistent, and dependent. Discuss each of these types of solution that can be generated, and describe the graph of each possibility.

    asked by tammy on March 13, 2011
  93. Chemistry!

    a)consider the following reaction: Mg(s)+ 2HCl(aq) --> MgCl2 (aq)+H2 (g) What minimum amount of 1.75 M HCl is necessary to produce 27.5 L of H2 at STP? b) What is the freezing point of an aqueous solution that boils at 102.1 C?

    asked by Justin on April 26, 2010
  94. science

    table salt-sodium chloride, one of the most common substances occuring in nature-is best classified as which of the following? a)a compund b)a mixture c)a solution d)an alloy e)an amalgam

    asked by jessica on October 3, 2007
  95. chemistry

    On heating 25g of a saturated solution to dryness at 60oc, 4g of anhydrous salt was recovered. Calculate its solubility in grams per 100g of solvent

    asked by dare on May 2, 2016
  96. chemistry

    How much heat (in Joules) is gained by the water where a chemical reaction takes place in 100 mL aqueous solution and has a temperature increase of 15C?

    asked by debra on March 8, 2010
  97. Chemistry

    Determine the boiling point of a solution contanting 36.1grams calcium chloride molar mass 112 in 200.0grams water.

    asked by Chris on March 7, 2013
  98. Chemistry

    A compound has four pKa values (3.5, 5.8, 9, and 12). Calculate the pH of the solution when 500 ml of 0.50 M of tetrasodium X is mixed with 650 ml of 1.0 M HCl. Include chemical equations in the answer.

    asked by dhruti on September 5, 2012
  99. college chem

    How much heat (in Joules) is gained by the water where a chemical reaction takes place in 100 mL aqueous solution and has a temperature increase of 15C?

    asked by debra on March 8, 2010
  100. math

    use the substitution method. Show your work. If the system has no solution or an infinite number of solutions, state this 3x + 24y = 24s,27x – 15y = -15 .

    asked by carol on May 2, 2011

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