1. Science

    Family Smith is interested in buying a solar energy system. After some search on internet they have found two different systems that they are considering. System A is a PV system based on multicrystalline silicon solar cells and System B is a PV system

    asked by Anonymous on September 21, 2013
  2. Physics

    sigh this is killing me here... ok rockets launch at 250 m/s @ an angle of 75.0 degrees. There's a mountain 2500m away from launch point that is 1800m high. There's a boat 610 m from the island. So i'm suppose to find out how much it'll clear the moutain

    asked by physics on January 14, 2009
  3. physics

    sigh this is killing me here... ok rockets launch at 250 m/s @ an angle of 75.0 degrees. There's a mountain 2500m away from launch point that is 1800m high. There's a boat 610 m from the island. So i'm suppose to find out how much it'll clear the moutain

    asked by physics on January 14, 2009
  4. English

    I need help fixing up this essay so that it flows betters. Thanks Assignment: Compose a brief essay which specifically develops topic including a clear and relevant topic sentence. Provide at least one specific example and detail. 1. Attendance demands

    asked by Keisha on October 10, 2010
  5. moles/solutions.

    I have three questions. The first one I got an ansser of 6.02 X 10^23. The question is this. How many molecules of sucrose (C-12,H-22, O-11) molecular weight, 342, would be present in one mole of sucrose? The other two questions I have are related. A) The

    asked by sarah on September 17, 2006
  6. Finanacial accounting

    I am having touble how to work with the retail inventory method to estimate the companies year end inventory. i have the following information but i just do not see it with even the example in the book. It is in a 5x3 matrix of colimns and rows. what is in

    asked by student on December 3, 2007
  7. math

    3. Which of the following appears to be an irrational number? (1 point) 3.72727272… – .073303330… 4. A picture frame is 12 inches long and 9 inches wide. In inches, what is the diagonal length of the picture frame? (1 point) 21 inches 15 inches 8

    asked by hellllllppppppppppp on October 18, 2016
  8. Physics

    A factory worker pushes a 29.2kg crate a distance of 4.1m along a level floor at constant velocity by pushing downward at an angle of 28 degrees below the horizontal. The coefficient of kinetic friction between the crate and floor is 0.25. (a) What

    asked by Garrett on March 17, 2014
  9. Chemistry

    I need help with this question, I don't know how to set up the formula to work it out? Calculate the dissociation constant of a weak monoprotic acid if a 0.08 M solution of this acid gives a hydrogen-ion concentration of 0.0001 M?

    asked by rebekah on April 3, 2016
  10. Chemistry

    The Ksp of calcium hydroxide, Ca(OH)2, is 4.68 x 10-6 at 289.15K. Calculate the pH of a saturated solution. Here's my work: 4.68 x 10-6= 4s^3 s= 0.0105 -log(0.0105)= 1.98 14-1.98=12.02 The answer is supposed to be 12.324, but I'm not sure what I'm doing

    asked by Mandy on December 4, 2014
  11. calculus

    Could somebody please check these for me? Solve the differential equation with the given initial solution. 1. (dy/dx)=(-y/3) for y(0)=10 my answer was y=10e^(-x/3) 2. dP/dt=P+4 for P(0)=100 my answer was P=104(e^t)-4 3. dz/dt=te^z for z(0)=0 my answer was

    asked by tia on April 14, 2008
  12. calculus

    Could somebody please check these for me? Solve the differential equation with the given initial solution. 1. (dy/dx)=(-y/3) for y(0)=10 my answer was y=10e^(-x/3) 2. dP/dt=P+4 for P(0)=100 my answer was P=104(e^t)-4 3. dz/dt=te^z for z(0)=0 my answer was

    asked by tia on April 16, 2008
  13. Computer Sciene-java

    Write a loop that will continuously prompt the user for integers to sum, -1 to exit. Sum these values and display the sum to the console. Here is what I have so far, but I feel like I am missing something: public class Sum1 { public static void main

    asked by Lisa on November 1, 2009
  14. psy- please revise

    Biomedical and psychotherapy are two basic approaches to treating psychological disorders. A number of approaches fall under the category of psychotherapy, but they all include the following four essential characteristics: 1. systematic interaction between

    asked by rose - Ms. Sue on May 29, 2008
  15. calculus

    Find the second derivative of y=loge(logex) Show that y=loge(logex) is a solution of the equation xd^2y/dx^2 + x(dy/dx)^2 + dy/dx=o

    asked by daria on March 30, 2008
  16. physics

    A plane leaves Seattle, flies 85 mi at 22 degrees north of east, and then changes direction to 48 degrees south of east. After flying 115 mi in this new direction, the pilot must make an emergency landing on a field. The Seattle airport facility dispatches

    asked by Jean on September 12, 2012
  17. Chemistry

    I don't really understand how to do this problem, or where to start exactly. Can someone explain to me where to start and how I can solve the problem in a step by step process? Thank you in advance! 1. An acetic acid / sodium acetate buffer solution is

    asked by Aaron on March 25, 2014
  18. algb

    Z the Intergalactic Candy Store for $1.75. Jeejuu paid $1.88 and got 4 xylobars and 1 yackity. How much Dado pay for 1 xylobar and 2 yackities?imak bought 3 xylobars and 5 yackities from .....Write a system of equations. Then solve the equations using the

    asked by Amber on October 1, 2014
  19. physics

    A ball bounces to 34 percent of its original height. *1) What fraction of its mechanical energy is lost each time it bounces? *2) What is the coefficient of restitution of the ball-floor system? - I was able to solve part one and get an answer of .66, but

    asked by David on April 5, 2016
  20. Precalculus(NEED HELP ASAP PLEASE!!)

    Solve: sin(theta)+cos(theta) = 1 0 < or equal to theta < 2pi Solution Set:__________ ?

    asked by jh on March 25, 2010
  21. Algebra

    Solve |9 – 4x| > 7 and write interval notation for the solution set. A.(1/2, 4) B. (-4,-1/2) C. (1/2, infinity) D. (-infinity U (4, infinity) I say the answer is D..Am i correct?

    asked by Rachale on July 7, 2009
  22. Intermediate Algebra

    Evaluate the exponential function for three positive values of x, three negative values of x, and at x=0. Show your work. Use the resulting ordered pairs to plot the graph; State the domain and the range of the function. f(x) = e^x

    asked by Samantha on September 10, 2010
  23. Chemistry

    I still don't understand how to do this problem; grams/molar mass I understand, but I need to see the steps CLEARLY. 43. How many moles are in 25.0 grams of potassium? Show your work and round your answer to the appropriate number of significant figures.

    asked by mysterychicken on October 23, 2010
  24. math (word problem)

    Suppose a car tire has a diameter of 26 inches. How many rotations will thee tire make if the car travels 1 mile? Round to the nearest tenth. If you get answer please show work of how to get there. Thanks!

    asked by emma on March 29, 2011
  25. distance

    some bank robbers leave town traveling at 70 mph. Ten minutes later, the police are chasing them at 78mph. How long will it take the police to overtake the robbers. show work if possibly thank you

    asked by John P on March 8, 2009
  26. math/algebra

    if a doctor prescribes 30 units of insulin in 500 ml to be administered over 2 hours, how many drops per minute should be administered if the set is calibrated to deliver 20 drops per ml? i don't know how to get it and i need to show work... this is urgent

    asked by Trixie on September 9, 2008
  27. math

    Graph the equation by completing the table and plotting the points. You may use Excel or another web-based graphing utility. a) y = 3x - x2 Use the values of x provided in the table to find the y values. Show your work.

    asked by shirley on September 17, 2011
  28. algebra

    Find a linear equation in the form P = mt + b (y = mx + b), which gives the population, P, t years from 2010. This is based off of an initial population of 6,000 in 2010, with a growth of 200 ppl per year. Please show work

    asked by Carmine on December 2, 2008
  29. Math

    The distance s in feet that a body falls in t seconds is given by the formula s=16t^2. If a body has been falling for 5 seconds, how far will it fall during the 6th second? Please show work/explain A. 16 ft. B. 80 ft. C. 176 ft. D. 400 ft. E. 576 ft.

    asked by Johnny on May 8, 2014
  30. math

    Use the five steps for problem solving to answer the following question. Please show all of your work. The volume of a rectangular box is limited to 1100 cu. in. If the height is 8 inches and the width is 10 inches how long can the box be?

    asked by Anonymous on March 16, 2011
  31. chemistry

    Calculate the formal charge on each non-hydrogen atom in eachof the following molecules (show your work) i know the answer but can someone tell me how to get to the answer? 1) H2C=N=N(2 dots on top and on side) 2. H2C-N(3 bonds)C(2dots)

    asked by ben on January 18, 2011
  32. calculus

    1.) values of f(t) are given in the following table: t 0 2 4 6 8 10 f(t) 137 112 88 68 49 34 a. Does this function appear to have a positive or negative first derivative? Second derivative? * I think both derivatives are negative b. Estimate (f prime) f^'

    asked by JJ on February 22, 2012
  33. money and banking

    bought a bond for $10,000. received interest of $400 at end of year, as well as $10,000 principal. inflation rate last year is 5%, calculate the real return. show work

    asked by debra on October 31, 2010
  34. Vince

    Please show work for Determine the final end (final) value of n in a hydrogen atom transition, if electron starts in n = 1 and the atom absorbs a photon of light with an energy of 2.044 X 10^-18J? thank you very much for your help

    asked by Joey on September 17, 2015
  35. Chemistry

    Ytterbium, atomic number, 70 is the first element in the periodic table to have the first four shells full. work out the number of electrons in the fourth shell/ level of ytterbium? Please show all working out with no abbreviations and please help

    asked by cake on November 14, 2017
  36. math

    compounded- what would be the amount of compound interest on $12,000 invested for one year at 6%, compounded quarterly? round your answer to the nearest tenth. could you show me the work please ? i had $737.00 is that answer correct?

    asked by linda on November 13, 2012
  37. algebra 2

    use a graphing calculator to graph the function y=x^2-3x+15. a. what does the graph let you conclude about real number solutions of x^2-4x+13=0? explain. b. substitue 2-2i for x in the equation x^2-4x+13=0. simplify. is the resulting equation true? show

    asked by kelli on May 9, 2011
  38. Calculus - series

    I'm getting this answer wrong, can someone please help show me what i'm missing?? thank you :) Infinity of the summation n=0: [(-1)^n pi^(2n)] / [6^(2n) (2n)!] this is my work: [(-1^0) pi^(2*0)] / [6^(2*0) (2*0)!] + [(-1^1) pi^(2*1)] / [6^(2*1) (2*1)!] +

    asked by COFFEE on July 28, 2007
  39. Math

    This is confusing me! I don't even know what the question means! "Convert the map scale to a unit rate. How many inches represent one mile? Show your work. Interpret the meaning of the unit rate. 3/10 in. = 7/8 mi" Can someone help?

    asked by Wishwash on November 29, 2017
  40. math

    I'm so lost I have no idea. Please help Write the equation of the line that represents this graph. Show your work or explain how you determined the equations. graph of line going through ordered pairs (0, 300) and (450, 0)

    asked by Lucy on October 27, 2015
  41. Math

    The diameter of a tire is 2.5 ft. Use this measurement to answer parts a and b. Show all work to receive full credit. I need help with part B About how many times will the tire have to rotate to travel 1 mile? (1 mile = 5,280 ft)

    asked by Plz Help on April 23, 2019
  42. Calculus Assignment

    Hey there. Okay well I just started first year university and we got an assignment to sorta brush up our rememberance of everything and well...I'm not remebering to well. If anyone can help me with this question that would be great. Thanks. The secant

    asked by Tracy on September 12, 2006
  43. Help me! Geometry

    A design on the surface of a balloon is 5 cm wide when the balloon holds 71 cm^3 of air. How much air does the balloon hold when the design is 10 cm wide? Explain the method you use to find the amount of air. How would I solve this step by step?

    asked by Alexa on September 28, 2015
  44. Chemistry

    Suppose you dilute 20.0 mL of a 0.130 M solution of Na2CO3 to exactly 100.0 mL. You then take exactly 15.0 mL of this diluted solution and add it to a 250-mL volumetric flask. After filling the volumetric flask to the mark with distilled water (indicating

    asked by Julian on October 4, 2015
  45. Physics

    I need help with the second part of this question. Please show work so I can see. Thanks. I. The fastest land mammal, the cheetah, can accelerate from 0 mi/hr to 70.0 mi/hr in 3.0 seconds. What is the acceleration of the cheetah? Give your answer in units

    asked by Anonymous on March 5, 2015
  46. Acceleration

    I need help with the second part of this question. Please show work so I can see. Thanks. I. The fastest land mammal, the cheetah, can accelerate from 0 mi/hr to 70.0 mi/hr in 3.0 seconds. What is the acceleration of the cheetah? Give your answer in units

    asked by andrea on March 5, 2015
  47. biology

    1. how do molecules of a polar compound differ from those of a nonpolar compound? 2. What happnens when ionic compounds are mixed with water? 3. what is capillarity? 4. Critical Thinking: Most automobiles have water-cooled engines. What must be true about

    asked by lamiya(again) on September 12, 2009
  48. U.S. History

    please check this answer 1. A major goal of the encomienda system was to a. force Native Americans to work for Spanish colonist b. drive Native Europeans off their land c. help Europeans adapt to Native American culture d. prevent the development of social

    asked by y912f on January 21, 2009
  49. Physics

    A coin slides over a frictionless plane and across an xy coordinate system from the origin to a point with xy coordinates (3.0 m, 4.1 m) while a constant force acts on it. The force has magnitude 2.4 N and is directed at a counterclockwise angle of 100°

    asked by Karen on November 4, 2009
  50. physics

    An electric motor exerts a constant torque of 10N⋅m to the shaft of a grindstone with mass 16kg and radius 0.5m. If the system starts from rest, find (a) the rotational kinetic energy of the grindstone after 8s, (b) the work done by the motor during this

    asked by joy on April 22, 2018
  51. Physics

    A coin slides over a frictionless plane and across an xy coordinate system from the origin to a point with xy coordinates (3.0 m, 4.1 m) while a constant force acts on it. The force has magnitude 2.4 N and is directed at a counterclockwise angle of 100°

    asked by Karen on November 2, 2009
  52. Physics

    A coin slides over a frictionless plane and across an xy coordinate system from the origin to a point with xy coordinates (3.0 m, 4.1 m) while a constant force acts on it. The force has magnitude 2.4 N and is directed at a counterclockwise angle of 100°

    asked by Corey on October 30, 2009
  53. English

    1. I want to do volunteer work at a nursing home. 2. I want to do volunteer work in a nursing home. (Which preposition should we use? Are both OK?) 3. I want to do volunteer work at an orphanage because I want to take care of orphans who are helpless. 4. I

    asked by rfvv on August 21, 2013
  54. Physics-I would like to ask once more!

    A ball is attached by two spring as shown [vvvOvvv]. If the mass is displaced a distance â–³x BELOW the equilibrium position h (see figure A). Determine whether vertical SHM is possible for the system shown.If so, find the natural frequency. (Figure

    asked by Marco Tsang on December 4, 2010
  55. Microeconomics

    We consider an exchange economy and i have to show in an edgeworth box that an allocation can be individually rational (meaning that no consumer prefers the initial bundle to the bundle obtained in the allocation) and pareto optimal without being a walras

    asked by Ansi on April 12, 2007
  56. Chemistry

    We had a lab where the standard solution was potassium hdrogenphthalate. In this we added 3 drops of phenolphtalein indicator and then we ran sodium hydroxide into the solution. We did four different flasks and the final readings for these then were 26.00

    asked by Amanda on October 16, 2012
  57. Physics

    Alright, I can't figure it out, here's the problem. 3. A boy is giving his little sister a ride in the wagon. He pulls with an applied force of 20N. The frictional force against him is 20N and the sled is traveling 2m/s. If the boy pulls the wagon 45m, how

    asked by Ashtin on January 28, 2016
  58. calculus

    this question is a multiple choice question, however i don't know how to start or finish it. The solution set of |3x+2|

    asked by Selly on February 25, 2010
  59. Stats -Math

    1. We are interested in conducting a study in order to determine what percentage of voters of a state would vote for the incumbent governor. What is the minimum size sample needed to estimate the population proportion with a margin of error of 0.05 or less

    asked by Lauren on December 12, 2016
  60. math(apology)

    Sorry[samantha,jason,mary-beth,john,tyrik,aaron,katie,and tiffany]i will send you some work to show you i tryed] Whoever you are, Your IP address is being recorded. Stop the impersonation of a teacher now, or you will be banned. We just don't have time for

    asked by Writeacher on November 29, 2006
  61. BIS219

    These are the only ones I need help on, Thanks 1. Which of the following statements about information systems is not correct? A. Information systems are concentrated in the IS Department. B. Information systems tend to follow the structure of the

    asked by Trying on August 28, 2009
  62. statistics

    The probability that a married man watches a certain television show is 0.4 and the probability that a married woman watches the show is 0.5. The probability that a man watches the show, given that his wife does, is 0.7. Find the probability that a) a

    asked by Misael on February 25, 2012
  63. Integral calculus

    Please can anyone help with the following problems - thanks. 1) Integrate X^4 e^x dx 2) Integrate Cos^5(x) dx 3) Integrate Cos^n(x) dx 4) Integrate e^(ax)Sinbx dx 5) Integrate 5xCos3x dx The standard way to solve most of these integrals is using partial

    asked by Febby on April 13, 2007
  64. science

    a helium nuclide of mass M1 moving with a velocity Vo is incident on a stationary nuclide of mass M2. After collision M1 was deflected through an angle x and M2 an angle y. If the velocities of the nuclides after collision were V1 and V2 respectively show

    asked by Henry on April 17, 2016
  65. Pre Cal

    6-x=2x+9 If you are to solve the equation for x, first try to get the variable on one side of the equation. Let's subtract 2x from both sides to start (whatever operation you do to one side of an equation you must do to the other side as well): 6 - x - 2x

    asked by Kayla on January 15, 2007
  66. chemistry needs another look plz

    Posted by Lori on Tuesday, December 14, 2010 at 5:38pm. The mole fraction of an aqueous solution of potassium perchlorate is 0.125. Assuming that the density of this solution is 1.20g mL-1, calculate the following: (A) the mass percent of potassium

    asked by Lori on December 14, 2010
  67. Politics

    What does an authoritarian system thrive on? I was thinking about something like crisis (economic or social) etc that can help an authoritarian system implement their agenda. I need more definite words, though. Help?

    asked by Alex on November 15, 2009
  68. Physics

    A pulley system lifts a 500-lb block 1.0 foot with an effort of only 50 lb. If the 50 lb moves 30 feet, calculate the efficiency of the pulley system.

    asked by Isis on June 18, 2013
  69. physics

    When the frequency of a force applied to a system matches the natural frequency of vibration of the system, it starts vibrating with a: (I believe its larger amplitude)

    asked by ashley -- on April 13, 2011
  70. physics

    A pulley system is 76% efficient. If a 9000 kg box is lifted a distance of 8 m by a force of 700 N, how much rope is pulled from the pulley system?

    asked by luke on November 8, 2011
  71. economics

    How do market failure play a part in which a publicly funded health care system performs better than a privately funded system?

    asked by Ge on April 7, 2008
  72. Math

    I wanted to double check that I am correct on the work area and answers please. 1.Given f(x)=x+2 and g(x)= 3x-4. Find (f+g). Work: (x+2) + (3x-4) Answer: 4x-2 2.Given f(x)=x+2 and g(x)=3x-4. Find (f*g). Work: (x+2)(3x-4) Answer: 3x² +2x-8 3.Given f(x)=x+2

    asked by kim on September 30, 2014
  73. CHEMISTRY

    HOW CAN U TELL IF HNO3 +KNO3 IS A BUFFER SOLUTION A buffer solution must contain a weak acid and its conjugate base OR a weak base and its conjugate acid. HNO3 is a strong base and KNO3 is the salt of a strong base (KOH) and a strong acid (HNO3);

    asked by CANDY on February 27, 2007
  74. English

    (Thank you. I corrected them. Does 'something' in Sentence 1 mean 'an important thing'? More explanation, please. Thank you.) 1. Volunteer work is not something that you must do. 2. Volunteer work is not anything that you must do. 3. Volunteer work is not

    asked by rfvv on November 22, 2009
  75. Chemistry

    I found the following procedure to prepare starch indicator solution on a website:- To prepare starch indicator solution, add 1 gram of starch (either corn or potato) into 10 mL of distilled water, shake well, and pour into 100 mL of boiling, distilled

    asked by annie on October 6, 2010
  76. Programming

    Write a program to do the following: In main, declare a Player Name Array and a Score Array. Declare the size of the arrays to be 100. In the InputData( ) method, input the player name and score into the arrays for an unknown number of players up to 100.

    asked by Anna on April 1, 2011
  77. chemistry due soon

    Which of the following phrases can describe an endothermic process? A. A system gives off energy as it cools down. B. Energy is released in forming the bonds of the product molecules in a reaction. C. The net energy change for a reaction is positive. D.

    asked by Morgan on November 22, 2014
  78. Geography

    Which is the result of zero population growth? population stability no natural increase*** a rapid decline in human population the elimination of high density populations

    asked by Mandy on May 6, 2016
  79. Social Studies

    Which is the result of zero population growth? a. population stability*** b. no natural increase c. a rapid decline in human population d. the elimination of high-density populations

    asked by Kaai97 on December 24, 2015
  80. urgent!!

    Summer Swimming Selection The municipal swimming pool in Nicetown has three different ways of paying for individual open swimming. Evan is trying to decide which way to pay. • Early Pay: Pay $45 before Memorial Day; swim any number of days • Deposit

    asked by Morgan on August 1, 2012
  81. Chemistry

    I really don't get this. The calculations shown don't make sense. Demonstrate that work is not a state function by calculating the work involved in expanding a gas from an initial state of 1.00: and 10.0atm of pressure to (a) 10,0 L and 1.0 atm pressure.

    asked by Xi on November 28, 2008
  82. JOB

    WHY CAN`T KIDS WORK Kids do a lot of work. They do their school work and help with chores around the home. Some kids who live on farms also help their families with the farm work. Some teenagers earn money by baby sitting or doing chores for other people.

    asked by KENDELISHA on October 13, 2006
  83. Calculus-HELP!!!

    Find a general solution to the first – degree ordinary differential equation. If an initial condition is given, find the corresponding particular solution. Write solution explicitly if possible: dx/dt=sqrt(x+t+1)

    asked by Sara on July 8, 2013
  84. Math

    a chemist has an 18% acid solution and a 36% acid solution. How many liters of each of these solutions should be mixed together to make 24L of 30% solution? Enter two numbers separated by a comma

    asked by Nancy on March 1, 2012
  85. Chemistry

    How do you calculate the pH of two acids in a solution? Examlp: a solution is made by adding 50mL acetic acid(Ka=1.76x10-5) to 50mL 1.00x10-3M HCl. What is the Ph of the solution?

    asked by Steve on November 5, 2012
  86. Chemistry

    You have a vinegar solution you believe to be 0.8 M. You are going to titrate 21.39 mL of it with a NaOH solution that you know to be 0.774 M. At what volume of added NaOH solution would you expect to see an end point? Answer in units of mL

    asked by Sara on March 11, 2014
  87. Chemistry

    A solution is prepared by mixing 8 mL of .2 M Fe(NO3)3, 10mL of .001 M NaSCN, and 7 mL of .1 M HNO3 a. calculate the concentration of Fe3+ in the solution b. calculate the SCN- in the solution

    asked by Anonymous on February 20, 2011
  88. Grade 11 Chemistry

    calculate the molarity of cl- ions in a solution made from mixing 50.0 ml of a 0.100 m/l solution of ferric chloride with 50.0 ml of a 0.500 mol/l solution of ammonium chloride

    asked by Sim on March 28, 2015
  89. AP Chemistry

    If 400 mL of 3.5 molar HCl solution is added to 200 mL of 2.3 molar NaOH solution, what will be the molarity of NaCl in the resulting solution? Answer in units of M.

    asked by Zach on February 24, 2016
  90. chemistry

    calculate the osmotic pressure of a solution obtained by mixing 100ml of 0.25M solution of urea and 100ml of 0.1m solution of cane sugar at 293k

    asked by sumit on June 6, 2013
  91. Chemistry

    A buffered solution is made by adding 48.6 g C2H5NH3Cl to 1.00 L of a 0.77 M solution of C2H5NH2. Calculate the pH of the final solution. (Assume no volume change. Assume that all solutions are at 25°C.)

    asked by Margaret on March 13, 2013
  92. science: chemistry

    A buffered solution is made by adding 47.4 g C2H5NH3Cl to 1.00 L of a 0.68 M solution of C2H5NH2. Calculate the pH of the final solution. (Assume no volume change. Assume that all solutions are at 25°C.)

    asked by Julie on July 23, 2015
  93. Analytical Chemistry

    25.0 mL of a 0.1067 M Solution of nickel (II) sulfate is diluted to 250 mL with water. 10 mL of this solution is taken and diluted to 1.0 L. Calculate the concentration of [Ni2+] in the final solution in ppm.

    asked by Anonymous on February 11, 2014
  94. Chemistry

    If 12.90 mL of a 18.2 Weight% solution of sodium chloride is diluted to a final volume of 3.00 liters, what is the Molar concentration of the diluted solution? The density of the original solution is 1.12 g/mL.

    asked by Danielle on January 23, 2011
  95. ap chemistry

    If 300 mL of 3.9 molar HCl solution is added to 200 mL of 2.2 molar NaOH solution, what will be the molarity of NaCl in the resulting solution? Answer in units of M

    asked by cheri on March 5, 2013
  96. Chemistry

    We have an aqueous solution that contains 22% (by mass) of a hypothetical solute Z. The formula weight of the solute Z is 215 g/mol. The density of the solution is observed to be 1.1 g/mL. What is the molarity of Z in this solution?

    asked by El on March 28, 2016
  97. chemistry

    0.1 mol of an organic acid is added to 600 ml of 0.5M KOH solution. The resulting basic solution can be neutralized by 200 ml of 0.5 M HCl solution. Which acid is ot?

    asked by lalala on April 1, 2015
  98. General Chemisty

    42.55mL of a standardized 1.005 M NaOH solution was necessary to exactly neutralize 30.0mL of an aqueous H2SO4 solution of unknown concentration. What is the molarity of the H2SO4 solution?

    asked by Cherokee on February 16, 2014
  99. chemistry

    suppose you made a buffer solution that was 0.050M in both HC2H3O2 and NaC2H3O2.Would the pH changes resulting from the addition of 0.1 M HCL solution to this buffer solution be the same as those you observed in experiment?

    asked by chelsy on November 21, 2011
  100. chemistry

    25.0cm3 of a solution containing 2.0g of NaOH per 250cm3 of a solution of H2SO4 for complete neutralization. Calculate the concentration of the acid solution in (i) mol/dm3 (ii) g/dm3? (H = 1.0, O = 16.0, Na = 23.0, S = 32.0)?

    asked by poppy on April 18, 2019

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