# 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

91,330 questions, page 158
1. ## chemistry

A lab technician determines the boiling point elevation of an aqueous solution of a nonvolatile, nonelectrolyte to be 1.95°C. What is the solution's molality?

asked by MaryJ on November 4, 2010
2. ## chemistry

A lab technician determines the boiling point elevation of an aqueous solution of a nonvolatile, nonelectrolyte to be 1.95°C. What is the solution's molality?

asked by MaryBeth on November 4, 2010
3. ## Chemistry

what is the molarity of a solution prepared by dissolving 222 g of sodium carbonate in enough water to make a solution volume of 3250 mL's?

asked by Heather on July 9, 2010
4. ## Chemistry

A 4.379 g sample of MgCl2 is dissolved in enough water to give 750.0 mL of solution. What is the chloride ion concentration in this solution?

asked by Chris on April 14, 2014
5. ## Chemistry help

2.00g of NaOH are dissolved in water to make 2.00L of solution. What is the concentration of hydronium ions, [H3O+], in this solution?

asked by Anonymous on July 29, 2013
6. ## chemistry

I'd like to do a titration test, I've got a sulphuric acid solution @ 1M (2N) but I need one @ 0.12N. How many ml of the 1M (2N) solution do I need to add to distilled water to make up 100ml please?

asked by Graham on August 2, 2013
7. ## Chemistry

calculate the molarity of a solution made by dissolving 0.750 grams of Na2SO4 in enough water to form exactly 850 mL of solution.

asked by Anonymous on October 16, 2012
8. ## Chemistry

Fe^3+(aq) + L (aq) ⇌ FeL^3+(aq) Kf= 4.68x10^25 A 1.00 L solution of 1.00g/L of Fe^3+(aq) has a 1.00 mol of L added. What is the equilibrium concentration of iron (III), (i.e., [Fe^3+]eq) in the final solution?

asked by TS on August 18, 2018
9. ## chemistry

What would be the resulting molarity of a solution made by dissolving 21.9 grams of KCl in enough water to make an 869-milliliter solution?

asked by smith on November 29, 2010
10. ## Algebra Help

I have a question regarding this problem below? I noticed it in an eariler post, and have come to figure that my text book has it like this? What would be the solution for this? x+sqrt(11-x)= 5 x = 2? OR 2,7? OR NO solution? I say x = 2 only? Any Thoughts?

asked by Robert on August 3, 2009
11. ## Chem 2

A solution is made by mixing 47.0 mL of ethanol, C2H6O, and 53.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C?

asked by Pagye on July 14, 2012
12. ## chemistry

What is the osmotic pressure in torr of a 0.0155 M glucose solution at body temperature ( 35.7 °C)? What are the boiling and freezing points for the same solution?

asked by Ali on April 22, 2013
13. ## General Chemistry

Titration between iodine and thiosulphate. Why starch solution has to be added when the solution just turned pale yellow, but not at the beginning of reaction?

asked by ConfuseChem on November 30, 2012
14. ## Chemistry

when dissolved in an aqeous solution, which of the following salts will yield an acidic solution? NH4Cl, NaClO4, Na2S, MgBr2, Ba(CH3CO2)2

asked by james on March 22, 2010
15. ## chemistry

How many milliliters of 0.50M NaOH solution are required to titrate 20.0mL of a 0.20M H2SO4 solution to an end point?

asked by Anonymous on December 4, 2014
16. ## chemistry

When excess solid Mg(OH)2 is shaken with 1.00 L of 1.2 M NH4Cl solution, the resulting saturated solution has pH = 9.30. Calculate the Ksp of Mg(OH)2 I am not sure where to even begin on this problem.

asked by Raj on March 21, 2010
17. ## chemistry

A solution of Na2CO3 is added dropwise to a solution that contains 1.34×10−2M Fe^2+ and 1.33×10−2M Cd^2+ . What CO3^2- concentration of is need to initiate precipitation? Neglect any volume changes during the addition.

asked by CHEMISTRY on March 14, 2009
18. ## Chemistry

What is the molarity of a solution made by dissolving 2.00g of potassium chloride (KCl) in enough water to make 150 ml of solution?

asked by Gerard on April 19, 2017
19. ## Chemistry

You have 475 mL of an 0.47 M acetic acid solution. What volume (V) of 1.10 M NaOH solution must you add in order to prepare an acetate buffer of pH = 5.00?

asked by Mark on January 19, 2013
20. ## Chemistry

How many milliliters of 0.540 M sodium sulfate solution would be needed to precipitate the calcium ion from 60.0 mL of 0.180 M CaCl2 solution?

asked by Anonymous on November 8, 2016
21. ## chemistry

calculate the molarity of an acetic acid solution if 25.00mL of the solution required 35.25mL of 0.1200M NaOH for neutralization.

asked by Anonymous on October 13, 2012
22. ## CHEMISTRY

0.15g of hydrogen chloride (HCl) is dissolved in water to make 6.5L of solution. What is the pH of the resulting hydrochloric acid solution?

asked by Anonymous on February 17, 2014
23. ## Chemistry

25.0CM OF A DILUTE HYDROCHLORIC ACID SOLUTION WAS NEUTRALIZED BY 18.8CM OF A SOLUTION OF SODIUM HYDROXIDE WITH A CONCENTRATION OF 0.12CM

asked by LAABES on November 11, 2018
24. ## chemistry

What is the maximum amount of silver in grams that can be plated out of 3.8L of an AgNO3 solution containing 3.3% Ag by mass? (Assume that the density of the solution is 1.02g/mL .)

asked by Anonymous on November 29, 2014
25. ## Chemistry

If 535 Ml of gaseous HCL, at 26.5 degrees Celsius and 747mm Hg, is dissolved in enough water to prepare 625 ml of solution, what is the PH of the solution?

asked by ChemHurts on August 5, 2009
26. ## Chemistry

If I leve 750 mL of 3.6 sodium chloride solution uncoverd and 150 mL of the solvent evaporates overnight, what is the new solution concentration?

asked by Emma on February 20, 2014
27. ## chemistry

I asked this before, but got no response. A) If you make up a solution of 250 mL of 0.1 M TRIS in the acid form, what will be the pH? B) If you add 2 mL of 1 M NaOH to the solution in part A, what will be the pH? Thanks.

asked by student on February 3, 2008
28. ## chemistry

what is the mass percent of an aqueous sodium hydroxide solution in which the molarity of NaOH is 4.37M? the density of the solution is 1.1655 g/mL.

asked by Anonymous on April 22, 2014
29. ## chemistry

If 150.0 Ml of HCL solution are required to react completely with .35 moles of solid NaOH whats the molarity of the solution?

asked by Aleander Azumah on October 12, 2009
30. ## chemistry

How many milliliters of a 15.0%, by mass solution of KOH(aq) ( d= 1.14g/mL ) are required to produce 27.0 L of a solution with pH = 11.70? I'm really not sure how to do this, it's from Acids & Bases chapter. Any help is appreciated, thanks. (:

asked by Agatha on February 22, 2009
31. ## chemistry

you have 20ml of an aqueous solution of 0.2M NaOH. if you add distilled water to this solution until you have 200ml , what will be the concentration? How many times did you dilute it?

asked by katlego on August 17, 2017
32. ## URGENT CHEMISTRY

A solution of hydrogen peroxide is 24.26% by mass and has a density of 1.11g/cm^3. the molarity of the solution? 7.54M .273M 8.03M 8.37M none of these

asked by Cotton McKnight on March 9, 2011
33. ## Chemistry

A volume of 10.0 mL of a 0.00650 M solution of Cl- ions are reacted with 0.500 M solution of AgNO3. What is the maximum mass of AgCl that precipates?

asked by Toni Jones on March 7, 2011
34. ## Chemistry

A student mixed 40ml of 0.2m Na2co3 solution with 50 ml f 0.25M cacl2 solution , what is the except number of moles of naclkkw that I will be formed ?

asked by Mariam on April 20, 2014
35. ## Chemistry

What is the morality of a solution prepared by dissolving 10.60g of sodium trioxocarbonate (v) in enough distilled water to obtain 250.0 ml of a solution?

asked by Charles on November 21, 2016
36. ## Chemistry

What volume of a 0.22mol/L hydrochloric acid solution is needed to cause the pH of 25.00mL of a 0.15mol/L lithium hydroxide solution to have a pH that s equal to 7.00

asked by Amy on February 16, 2013
37. ## chem

a volume of 10.0 ml of a 0.00450 M solution of Cl- ions are reacted with 0.500 M solution of AgNO3.What is the maximum mass of AgCl that precipitates?

asked by sam on October 10, 2011
38. ## Basic Chemistry

What is the molar concentration of Na+ in a solution prepared by dissolving 100.0g of Na3PO4 in sufficient H20 to form 2.00L of solution??

asked by Steph on February 28, 2011
39. ## Chemistry

If 8.723 grams of sodium bicarbonate are dissolved in water to produce a 250.0mL solution, what is the molarity of this solution?

asked by Maegan on October 10, 2016
40. ## chemistry

A solution is made by dissolving 0.10 mole of Na2SO4 in water to a final volume of 1.00 L. What is the molar concentration of Na+ ions in the solution?

asked by Dolores Ramirez on April 5, 2013
41. ## Chemistry

KClO3 dissociated in H20 should form a neutral solution. The results proved to be a slightly acidic solution with a pH of 6. What happened?

asked by Misha on March 2, 2013
42. ## CHEM 1411

What volume (in mL) OF 0.0215M HBr solution is be required to titrate 0.235L of a 0.0150M Ca(OH)2 solution? Ca(OH)2+2HBr= CaBr2+2H2O

asked by JACI WINLOW on October 18, 2016
43. ## Alg 1

Completing the square: Which of the following is a solution x^2 + 14x + 112 = 0? If necessary round to the nearest hundredth. x= -0.24 x= -4.24 x= 4.24 no solution I worked it and got neither of the answers. I got x= 0.9 and x=-14.9. Where did I go wrong?

asked by Jane on April 14, 2013
44. ## ChemB

A forming acid solution has a pH of 3.25. Which of these substances will raise the pH of the solution upon addition? Explain. A) HCl B) NaBr C) NaCHO2 D) KCl

asked by ALISON on March 12, 2012

Find the percent by mass of sodium chloride in a 1.45M NaCl solution. The density of the solution is 1.05g/mol .

asked by Rose on October 5, 2009
46. ## chemistry

Calculate the concentration (% W/V) of NaCl solution that was made by dissolving 15.0 g of sodium chloride in enough water to make 300.0 mL of solution.

asked by Chemistry Chick on October 29, 2011
47. ## chemistry

Calculate the molarity of a sodium hydroxide solution if 10.42 mL of this solution are needed to neutralize 25.00 mL of 0.2043 M oxalic acid. how do you do the working out

asked by Anonymous on July 18, 2013
48. ## Chemistry

Which one of these properties is directly proportional to molality and why? A) Electrical conductance B) Heat of solution C) Equilibrium of solution D) Vapour pressure Thanks

49. ## Chemistry

A solution of X2CO3 has a concentration of 15.2 g/dm^3. 25 cm^3 of this solution require 27.5 cm^3 of 0.2 M HCl for complete reaction. Calculate the ralative atomic mass of X

asked by Lily on June 28, 2014
50. ## Chemistry

What volume of a 0.5 M solution is required to prepare 250 mL of a 0.15M solution? (Note: M = mole per Litre) Is 175ml correct?

asked by Many on November 13, 2012
51. ## Chemistry

What is [H3O+] in a solution obtained by dissolving 215 mL HCl(g), measured at 23 degrees C and 757 mmHg, in 4.30 L of aqueous solution?

asked by Raj on February 14, 2009
52. ## chemistry

What is the molarity of the solution produced when 14.1 grams of ammonia is dissolved in sufficient water to prepare .100 liters of solution?

asked by Drew on May 22, 2012
53. ## chemistry

Calculate the molarity if a Ba(OH)2 solution if a 37.25ml portion of this solution is neutralized by 45.00mL of 1.500M HCl. You will need the balanced reaction

asked by Anonymous on March 14, 2014
54. ## BioChem

Write the chemical equation for the reaction that occurs when you add NaOH solution to NaH2PO4/Na2HPO4 buffer solution

asked by Megan on March 23, 2012
55. ## Chemistry

Pb(NO3)2(aq) 2 x 10-3 M and Na2SO4(aq) 2 x 10-3 M Identify the ions that are present in each solution, and calculate their concentrations. If 1 L of each solution are mixed, will a precipitate be formed? Why?

asked by Sam on May 16, 2012
56. ## Chemistry

If 8.723 grams of sodium bicarbonate are dissolved in water to produce a 250.0mL solution, what is the morality of this solution?

asked by Anonymous on October 10, 2016
57. ## chemistry

calculate the potential of silver electrode in a contact with the following a/ solution that is 0.0150M in I2 and saturated with AgI b/solution that is 0.0040 M in CN- and 0.0600M in Ag(CN)2^-

asked by lyn on June 7, 2011
58. ## chemistry

A 4.691 g sample of MgCl2 is dissolved in enough water to give 750. mL of solution. What is the magnesium ion concentration in this solution?

asked by nalleli on October 4, 2010
59. ## Chemistry

Does the solid Zn(OH)2 dissolve when concentrated lye, NaOH solution, is added to a beaker containing a saturated solution of Zn (OH)2 and a small amount of Zn(OH)2?

asked by Ron on May 5, 2010
60. ## Chemistry

0.15g of hydrogen chloride HCl is dissolved in water to make 8.0L of solution. What is the pH of the resulting hydrochloric acid solution?

asked by Jonah on March 1, 2013
61. ## Chemistry

What will be the concentration if 52 milliters of a solution that is 12 parts per million in sodium chloride is diluted with enough water to make 97 millilters of solution?

asked by Whitney on February 14, 2012
62. ## chemistry

A lab technician determines the boiling point elevation of an aqueous solution of a nonvolatile, nonelectrolyte to be 1.62°C. What is the solution's molality?

asked by Catherine on March 3, 2013
63. ## chemistry

Aqueous ammonia is commercially available at a concentration of 16.0 M. Part A How much of the concentrated solution would you use to prepare 500.0mL of a 1.30M solution?

asked by d on April 13, 2015
64. ## chemistry

A solution is made by dilution 400.mL of 2.0 M HCL to a final volume of 1000. mL. what is the pH of this solution? i'm stuck on this question i have no idea what to do, can anyone help? thanks:)

asked by Miley on May 15, 2008
65. ## chm

An aqueous solution that is 30.0 percent sulfuric acid (H2SO4) by mass has a density of 1.105 g/mL. Determine the molarity of the solution.

asked by victoria on February 2, 2015
66. ## Chem 121

A solution is made by dissolving 0.35 mole of LiI in enough water to give a final volume of 260.0 mL. What is the molarity of the solution?

asked by Barbara on July 26, 2011
67. ## Chemistry

Calculate the density of 150g of a 25% by wieght solution of sodium chloride dissolved in water and the volume of solution is 145ml.

asked by Elaine on January 24, 2012
68. ## Chemistry

Will the 90-100 mL of distilled water added to the acid solution (10.00 mL) significantly change the moles of H3O+ in the 1.00 M HCl solution? Why or why not?

asked by Ash on October 5, 2013
69. ## chemistry

calculate the molarity of solution cacl2 . if on the chemical analysis . it is found that 200 ml of solution contains 3 into 10 raise the power 22 cl- ions

asked by muskan on March 18, 2016
70. ## Chem 2

What is the molarity of a solution composed of 8.210g of Potassium Chromate (K2CrO4),dissolved in enough water to make .500 L of solution

asked by Cassidy on December 17, 2012
71. ## chemistry

A lab technician determines the boiling point elevation of an aqueous solution of a nonvolatile, nonelectrolyte to be 1.62°C. What is the solution's molality?

asked by kellyb on June 3, 2011
72. ## Chemistry

What is the mass percent of an aqueous sodium hydroxide solution in which the molality of NaOH is 6.25m? The density of the solution is 1.2219 g/mL

asked by Veronica on May 31, 2014
73. ## chemistry

What is the molarity of a solution composed of 2.23 g of potassium iodide (KI) dissolved in enough water to make 0.181 L of solution? Answer in units of M

asked by Roberta on February 25, 2014
74. ## Chemistry

When 400ml of a 0.01M MgCl2 solution is mixed with a 300ml if a NaOH solution at pH 9.0, a precipitate will form. True or False?

asked by Nick on April 9, 2018
75. ## Chemistry

If 87.3 mL of 0.225M KOH solution is mixed with 44.4 mL of 0.313M H2SO4 solution, would the resulting mixture be acidic, basic or neutral?

asked by Mary on June 3, 2014
76. ## CHEM

HOW MCH VOLUME OF DECA MOLAR SOLUTION IS REQD 2 PEPARE 500ML OF SOLUTION WITH DENSITY 1.03G/ML & HAVING MASS% =40%.

asked by AMIT on July 11, 2011
77. ## Chem7

Calculate the osmotic pressure (in torr) of a solution containing 17.15 mg of hemoglobin (molar mass 6.5 x 104 g/mol) in 12.8 mL of solution at 25 degrees C.

asked by Ryan on May 2, 2011
78. ## AP CHEMISTRY

Calculate [OH-] and pH for the following strong base solution; a solution formed by mixing 10.0 mL of 0.011 M Ba(OH)2 with 28.0 mL of 7.4 10-3 M NaOH working and answer would be appreciated

asked by MARY on February 18, 2012
79. ## chemistery

A student dissolves 196 g of H3PO4 (Molar mass = 98 g) in enough water to make one liter of solution. The molarity of the solution is ?

asked by ogb on December 9, 2012
80. ## Chemistry

what is the molarity of a solution prepared by dissolving 10.60g of Na2CO3 in enough distilled water to obtain 250.0ml of solution

asked by Mr Lonnie on February 25, 2018
81. ## Chemistry II

A solution is made by mixing 38.0 mL of ethanol, C2H6O, and 62.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C?

asked by Sam on July 17, 2012
82. ## chemistry

A 10 ml of hydrochloric acid solution of concentration equal to 0.1 mol per litre is added 90 ml of pure water. What's the pH of the final solution?

asked by wallace on September 16, 2018
83. ## Chemistry 1200

For each of these solutions, determine the boiling point of the solution 0.238 M glucose (C6H12O6) in water (Assume the density of the solution is 1.00 g/mL.)

asked by Rukky on January 25, 2011
84. ## chemistry

Calculate the volume of 2,180 ppm Pb(NO3)2 solution required to prepare 1.2550 L of a 0.0021 M Pb2+ solution.

asked by myles on February 15, 2012
85. ## Chem

What would be the resulting molarity of a solution made by dissolving 21.9 grams of KCl in enough water to make an 869-milliliter solution?

asked by Brittany on January 27, 2011
86. ## Math

An aircraft pilot wishes to fly from an airfield to a point lying S20oE from the airfield. There is a wind blowing from N80oE at 45 km/h. The airspeed of the plane will be 550 km/h. (a) What direction should the pilot steer the plane (to whole degree)?

asked by Jerome on October 2, 2018
87. ## easy geometry

Can you please show you solution and final answer here. Thanks! 1.Find the altitude,perimeter and area of an isosceles trapezoid whose sides have lengths 10 cm, 20 cm, 10 cm and 30 cm. 2. The formula A=P(a+r)^2 is used to find the amount of money A in an

asked by cyrus on December 14, 2014
88. ## physics

A projectile is fired with muzzle velocity v uphill over ground that slopes at an angle α to the horizontal. If the angle of projection is θ to the horizontal: i) show that the horizontal range is x = 2v2 (cos θ sin θ − cos2 θ tan α) /g ii) find

asked by 12345 on October 12, 2014
89. ## English

I'm posting you the sentences I'm most dubtful about. I included my doubts in parentheses. 1) Despite his victorious military campaigns Cromwell introduced unpopular restrictions on everyday life, such as, for example, the closing (?) of the theatres for

asked by Henry2 on September 18, 2011
90. ## Math

A class went on a field trip to see a play. Adult tickets cost \$18 each and student tickets cost \$12 each. There were 10 more students than adults that went to the play. If the trip cost \$240 in all, how many adults and students went to see the play? Write

asked by Unknown on February 29, 2016
91. ## Physics-totally bewildered!!

I have a physics question. This is for extra credit which I really need to earn- If I made a solar cell how would I know which material is best to use if given choices like aluminum with a work function of 4.1eV at a cost of 2.40Kg or platinum with a work

asked by Joni on April 23, 2011
92. ## Statistics/Probability

2. Two roommates, roommate X and roommate Y, are expecting company and are arguing over who should have to wash the dishes before the company arrives. Roommate X suggests a game of rock-paper-scissors to settle the dispute. Consider the game of

asked by y912f on July 7, 2013
93. ## chemestry

i don't know how to solve this problem,could anyone is here to give me the correct solution.It will be good for me. In a reactor of 1.5 L the same amount of C and H2O was introduced. When the reaction: C(s) + H2O ⇄ CO + H2 reaches the equilibrium at 1273

asked by Anonymous on June 19, 2016
94. ## math

Solve the compund inequality and graph the solution. -4-2 and I did t+2

asked by robert on December 26, 2007
95. ## math

Solve the compund inequality and graph the solution. -4-2 and I did t+2

asked by robert on December 26, 2007
96. ## math question

I am trying to study for a basic math entrance exam and can not recall how to work out the following question. Here it is: Three people who work full time are to work together on a project,but their total time on the project is to be equivalent to that of

asked by Heather on August 11, 2010
97. ## physics

how many excess electrons must be placed on each of two small metal spheres placed 3.00 cm apart in a vacuum if the force of repulsion betwen the spheres is to be 0.000000008 N? how do i solve this problem??=( help please.thx. Use Coulomb's Law: F = k

asked by Jarin on August 20, 2007
98. ## medical office percedures

Work Place Application 1-Assume that you have been selected to order a new computer system for the physician. Clinic personnel include: three physicians, six administrative personnel, and four clinical assistants, plus you, the office manager. Describe the

asked by Elizabeth on January 24, 2012
99. ## Math

Please help. 51. Solve: 125=(x3)/0.3^-3 a.7 b.14 c.15 d.9 53. 49x-2 = 7Ö 7 a.-5/4 b.5/4 c.11/4 d.-11/4 60. Simplify: 2log^3 6 - log^3 4 a.3 b.6 c.4 d.2 61. Solve the equation: logb (x^2 + 7) = 2/3logb 64 a.9 b.3 c. √23 d. ±3 62. Solve: (The fifth root

asked by Holly on May 21, 2013
100. ## Math

How would you solve this problem? Please include steps for me! Solve for θ in the interval 0 ≤ θ ≤ 2π: cos(θ )sin(θ ) − 1/ 2cos(θ ) = 0

asked by Harry on June 18, 2018