# 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 454
1. ## Calculus

Find the particular solution of the differential equation y'=(5x+21y)/7x satisfying the initial condition y(1)=5.

asked by Hannah on November 18, 2010
2. ## cerritos

how many grams of sodium choloride is needed to prepare 600ml of 9% saline solution?

asked by maribel on September 18, 2011
3. ## College Chem

How many mL of concentrated ammonia (14M) should be diluted to 250 mL to make a 0.75 M NH3 solution?

asked by Lisa on November 19, 2010
4. ## Algebra

Write the simplified form of the expression. {q^-2/3} {q^1/3} --------------- q^4/3 Using positive exponents. ------------------------------------- Solution: {q^-2/3} {q^1/3} = q^-1/3 = 1 --------------- ------ ---- q^4/3 q^4/3 q^5 Thanks in advance

asked by Lucina on January 19, 2015
5. ## Chemistry

What is the molarity of 782 mL of a solution that contains 0.056 mol of solute? Answer in units of M

asked by Anonymous on September 15, 2011
6. ## chemistry

how ,many grams of aspirin are required to react exactly with 29.40ml of a 0.6M solution of sodium hydroxide

asked by ujay on January 17, 2010
7. ## CHEMISTRY

Ignoring activities, determine the molar solubility (S) of Zn(CN)2 in a solution with a pH = 1.94. Ksp (Zn(CN)2) = 3.0 × 10-16; Ka (HCN) = 6.2 × 10-10.

asked by Anonymous on June 3, 2015
8. ## Chemistry

How much corn syrup should be added to water to make 200 ml of a 10% by volume solution?

asked by P on March 14, 2009
9. ## chemistry

What is the concentration of each type of ion on a 0.010 molar solution of Lithium sulfate (aq)?

asked by Alphonse on September 15, 2010
10. ## Chemistry

What is the concentration of the SCN- ion in the stock solution of 2.00 x 10-3 M NaSCN in 0.10M HNO3?

asked by noah on March 7, 2012
11. ## Science

If 48 gram solute is present in 500 ml H2O2 solution,what will be its strength by volume and % w/v respectively?

asked by Anonymous on November 11, 2016
12. ## chem

The ion product Of D2O is 1.35x 10^-15 at 25 degrees C. For a solution to be acidic the PDF must be what?

asked by court on April 22, 2012
13. ## chemistry

What is the concentraton of a solution made by dissolving 0.5 moles of solute in 9.0 liters of water?

asked by Juliettte on March 5, 2011
14. ## Chemistry

I would like to have 1 mole of Cl- ions in 500ml of water, how many grams of NaCl do I weigh out for this solution?

asked by Lindsey on January 22, 2011
15. ## Chemistry

What mass of the following solution contains 0.100 mol of solute? 0.334 molality NH4NO3

asked by Anonymous on April 24, 2011
16. ## Chemistry

What volume of 0.174 M Na3PO4 solution is necessary to completely react with 89.1 mL of 0.106 M CuCl2?

asked by Anonymous on October 10, 2010
17. ## chemistry

What is the equilibrium concentration of ammonium ion in a 0.77 M solution of ammonia (NH3, Kb = 1.8 ´ 10–5) at 25oC?

asked by Anonymous on April 5, 2010
18. ## chemistry

calcululate the molality of CsCl in a 8% by mass aqueous solution. answer in units of m

asked by chelsey on September 19, 2011
19. ## Math

Equation Models Question Symbolic Model 2x+3=(-5) Answer and check the solution please.

asked by Jazz on January 18, 2012
20. ## College Chemistry Help Please!

what is the pH of a solution that is 0.200 M in methylamine, CH3 NH2 CH3NH2+ H20 CH3NH3+ + OH- Kb= 4.2 x 10 ^-4

asked by shanice on November 9, 2010
21. ## chemistry

what volume of .0250 M MgCl2 should be diluted to 250.0 mL to obtain a solution with [Cl]=.0135?

asked by Shineylou on September 27, 2011
22. ## chemistry

What mass of Na2SO4 is needed to make 8.5L of 4.0M solution? Is the answer 7480 grams?

asked by lulu on March 20, 2016
23. ## CHEMISTRY

what volume of .0250 M MgCl2 should be diluted to 250.0 mL to obtain a solution with [Cl]=.0135?

asked by Shineylou on September 27, 2011
24. ## AP Chemistry

Will a non-volatile solute always lower the vapor pressure of the pure solvent in solution? Why or why not?

asked by Anonymous on November 21, 2009
25. ## chemistry

how many grams of CaCI would be required to produce a 85M (molar) solution with a volume of 2.0L

asked by Anonymous on April 9, 2015
26. ## Chemistry

How would the freezing point of a solution change if the unknown had ionized or dissociated? Explain.

asked by G on March 14, 2011
27. ## Algebra 2

Use synthetic division to divide p(x) = 3x3 − 10x2 − 31x − 12 by (3x + 5). Then check the solution.

asked by Linda on January 19, 2016
28. ## Chemistry

For a solution that is 0.168M NH3 and 0.106M NH4Cl calculate the following. [OH-] [NH4+] [Cl-] [H30+]

asked by Anonymous on April 8, 2015
29. ## General Chemistry

What is the molarity of OH- in a 5.78×10-3 M C6H5CO2Na solution that hydrolyzes according to the equation. C6H5CO2-(aq) + H2O(l) = OH-(aq) + C6H5CO2H(aq)

asked by carly on November 5, 2010
30. ## Chemistry

Calculate the molality of CsCl in a 18% by mass aqueous solution. Answer in units of m.

asked by Mike on October 11, 2010
31. ## Chemistry

What volume of 0.200 N H2SO4 is required to neutralize a solution containing 8.00 equivalents of NaOH?

asked by Joe on November 10, 2010
32. ## chemistry

What is the molar concentration of calcium hydroxide that has 0.185g solute in 100ml solution?

asked by n/a on March 12, 2011
33. ## Math

Is the (4, 1) a solution to the equation y = -x + 3? I honestly have no idea what this means. Does y = 4 and 1 = -x? If not then the answer should be no since (4, 1) is part of a graph

asked by NotAFan on September 5, 2017
34. ## chemistry

What is the equilibrium concentration of ammonium ion in a 0.77 M solution of ammonia (NH3, Kb = 1.8 ´ 10–5) at 25oC?

asked by Anonymous on April 5, 2010
35. ## Chemistry

? g of glucose C6H12O6 must be dissolved in 400 g of water to give a solution that is 0.258 m.

asked by Riley on April 7, 2008
36. ## kumar

determine the amount of NAOH dissolved in 250ml. of the solution by titrating it against N/10 H2SO4

asked by ujjwal on April 21, 2017
37. ## Chemistry

Calculate the freezing- and boiling-point changes for a solution containing 12.0 g of naphthalene (C10H8) in 50.0 g of benzene.

asked by Mariah on May 2, 2010
38. ## chemistry

how much solute are present in a solution that contains 100.0g of water, and is 9.0% by weight sodium bicarbonate?

asked by jen on November 12, 2016
39. ## Analytical Chemistry

Calculate the hydroxide concentration of a solution that is 0.1 F with NH3, and 0.25 F in respect to (NH4)2S04.

asked by juni on September 4, 2016
40. ## Chemistry

7. Suppose 45.0 mL of 0.250 M HNO3 was mixed with 35.0 mL 0.600 M Ba(OH)2. Calculate the pH of the final solution.

asked by CHIPNDALE on November 21, 2015
41. ## st. marys orthodox school

how much dilute sulphuric acid add for making 18 g/l of Mohr salt solution

asked by reeti anand on November 15, 2015
42. ## science

what volume of 0.115 M HClO4 solution is needed to neutralize 50.00 ml of o.o875 M NaOH?

asked by yvaine on September 7, 2017
43. ## chemistry

what is the actual freezing temperature of a 0.50m aqueous solution of sodium chloride?

asked by kim on May 18, 2016
44. ## Chemistry

How many milliliters of 0.135 M HCl are needed to completely neutralize 56.0 mL of 0.101 M Ba(OH)2 solution?

asked by Veronica on October 7, 2010
45. ## chemistry

how many grams of MgCl2 would you dissolve in 650mls of water to make a 0.45M solution?

asked by marie on September 8, 2011
46. ## Chemisty

In terms of saturation, how would you classify a KBr solution with a concentration of 78 g/100 g of water at 47°C?

asked by Hannah on August 1, 2011
47. ## chemistry

describe how you prepare a 250cm3 of 0.5M solution Na2C03.indicate the variouse laboratory apparatus you will use

asked by Dorcas on February 8, 2017
48. ## chemistry

the solution contain 6 grams of caustic soda dissolved per dm.find the percentage impurity

asked by ahmed on November 15, 2010
49. ## Chemistry

(a) How many grams of KNO3 are needed to make 430 mL of a solution that is to contain 2.9 mg/mL of potassium ion?

asked by Mark on June 3, 2015
50. ## Chemistry

what would be the concentration of chromate ion in a saturated solution of CaCrO4 (Ksp= 7.1x10^-4)

asked by Anonymous on May 18, 2010
51. ## science

Calculate the molarity of 500 ml of a solution containing 100 grams of glucose (C6H12O6).

asked by Anonymous on December 12, 2016
52. ## math

find missing coordinate of the order repair so it is a solution 2x+4y-6=0 (2, ) my answer was (2, 1/2) or (2,2/1) but it is incorrect

asked by Felicia on July 1, 2016
53. ## chem

what are some of the factors that affect melting point besides, impurities, pressure, and having a wet solution?

asked by Jason on October 14, 2008
54. ## Chemistry

How many moles of HNO3 are present if 0.116mol of Ba(OH)2 was needed to neutralize the acid solution?

asked by Mac on April 1, 2015
55. ## Chemistry

what is the osmotic pressure produced by a 1.20M glucose (CH12O6) solution at 25 degree

asked by Elsie on May 11, 2016
56. ## AED

How might that be a solution to dealing with instruction and assessments of varying levels of language development?

asked by NENAS on June 24, 2009
57. ## Chemistry

How many grams of lithium nitrate, LiNO3, are required to prepare 3.00 × 102 mL of 2.00 × 10–1 M solution?

asked by Chris on May 12, 2010
58. ## chemistry

what is the molarity of 20 grams of HCI mixed with water to make 1 liter of solution

asked by jhjmjj on June 7, 2010
59. ## chemistry

Calculate the pH of the solution that results from the mixture. 170 mL of 0.12 M C2H5NH2 with 285.0 mL of 0.22 M C2H5NH3Cl.

asked by Ellen on July 28, 2010

For a solution that is 0.168 M NH3 and 0.104 M NH4Cl calculate the following.? [OH-] [NH4+] [Cl-] [H3O+] How would you do this :-/

asked by Anonymous on March 12, 2012
61. ## Chemistry

What is the molarity of a solution that results when 3.64 g KCl is dissolved in water and diluted to exactly 200.0 mL?

asked by Van on February 27, 2016
62. ## chemistry

Calculate the ionization constant, Ka, of phenol (HC6H5O), a weak acid, if a 0.25 M solution of it has a pH of 5.24.

asked by Audrey on November 15, 2010
63. ## Chemistry

what is the percent by mass of a solution by dissolving 200 g of NaCI in 500 mL of water?

asked by Annyssa on June 15, 2016
64. ## Density of a CUSO4 solution

I need to determine the density of a CUSO4 solution of 1% concentration from a 10cc pipette volume.

asked by Lorraine on March 6, 2011
65. ## chemistry

What mass of KCl (MM = 74.55 g/mol) is required to make 550 mL of a 0.250 M solution?

asked by Cassie on November 10, 2014
66. ## Chemistry

How would you prepare 455 g of aqueous solution that is 6.50% sodium sulfate Na2SO4 by mass?

asked by Lauren on February 4, 2008
67. ## chemistry

What would be the MOLARITY (M) of the NaBr in the same buffer solution, if its concentration is now 0.9% (w/v)? Relative atomic masses:Na = 23; Br = 80

asked by aisha on October 24, 2014
68. ## chemistry

If you submerge a silver teaspoon in copper sulfate solution, what reaction would you expect and why?

asked by valentina on February 6, 2011
69. ## college

how do you calculate molar concentration for 1.50g NaCl in 100.00mL of solution?

70. ## chemistry

How many grams of na3po4 will be needed to produce 425ml of a solution that has a concentration of na+ ions of 1.30 M?

asked by James on September 11, 2010
71. ## chemistry

The bottle of hydrogen peroxide from the store says it is a 3% solution by mass. What is its molal concentration?

asked by billy bob j on April 17, 2008
72. ## Chemistry

What mass of the following solution contains 0.100 mol of solute? 0.334 molality NH4NO3

asked by Anonymous on April 24, 2011
73. ## chem

what is [Ag^+] in a solution formed by mixing 25.0 ml of 0.10 M AgNO3 with 50.0 ml of 1.50 M Na3PO4. Ksp for Ag3PO4=1.0x10^-21

asked by silvia on November 17, 2015
74. ## physical science

zinc electrode is placed in a solution of lead nitrate.write a balanced equation

asked by mphukhe on August 20, 2015
75. ## Algebra

Give one number in each space to create an equation that has no solution. 8x-3x+2-x= ___x+ ___

asked by J.J on April 7, 2016
76. ## Chemistry

The solution "head" dissolves in the water and the mixing "tail" dissolves in the oil. or The mixing "head" dissolves in the water and the solution "tail" dissolves in the oil. which one is right? thank you for your time!

asked by Baby on April 17, 2008
77. ## Linear Algebra

I previously posted this question under the wrong topic. Which of the following choices is a solution for: (-3-i)x1 + (1-2i)x2 = 0 (-7-9i)x1 + (7-4i)x2 = 0 for any value of the variable t [x1] = ? [x2] A:  [1+7i] * t B:  [1-7i] * t C:  [-1-7i] * t

asked by Michael on December 4, 2009
78. ## chemistry

calculate the weight in grams far a given solution of sodium thiosulphate crystals of strength 2.0M

asked by sonia on January 21, 2016
79. ## Chemistry

50 mL of 1M silver Nitrate is combined with 25 mL of 2 M potassium Chloride. What is the concentration of a resulting solution

asked by Chris on February 2, 2010
80. ## chemisty

calculate the molarity of a solution with .2 moles of sodim hydroxide dissolved in .5L of water

asked by Anonymous on April 27, 2011
81. ## chemistry

if an antacid tablet was dissolved in water would the solution become acid, base or neutral? why?

asked by Anonymous on October 9, 2010
82. ## chemistry

how many grams of NaOH are contained in 250 mL of a 400 M sodium hydroxide solution

asked by kelly on July 14, 2010
83. ## CHEMISTRY

What substances will increase the molar solubility of nickel(II) phosphate in a saturated solution?

asked by Anonymous on May 3, 2010
84. ## Math

(x+20)(x-9)(x+10)>0 Please help? I'm stuck...need to find the solution set. so far I have x^3+21x^2-70x-1800>0 am I correct so far? What do I need to do next?

asked by asd on October 7, 2010
85. ## civics, government, presidential elections 2008

How are Hillary CLintons views on illegal immigration different than the republicans...what makes her solution better?

asked by jan on February 4, 2008
86. ## science

How many grams of copper sulfate is needed to make 1125L of 25 ppm solution

asked by tracey on January 2, 2012
87. ## chemistry

How many grams of potassium permangate are needed to decolorized 1g of 2-pentene in basic solution

asked by john on October 4, 2011
88. ## college math

how many grams of NaOH are needed to make a 30% w/w solution using deionized water as the solvent

asked by Wanda on November 28, 2010
89. ## Chemistry

How many mL of acetone are required to make a 8.42 % v/v aqueous solution in a 300 mL volumetric flask?

asked by Hannah on November 12, 2016
90. ## chemistry

what is the new boiling point for a solution prepared from 1.40 mol of KCI 1.00kg of water?

asked by lkra on October 8, 2011
91. ## government secondary school

maths:x^4+3x-2/(x^2+1)^3(x-4)=(Ax+B)/(x^2+1)+(Cx+D)/(x^2+1)^2+(Ex+F)/(x^2+1)^3+G/(x-4)+H/(x-4)^2.fine the value of ABCDEFGH,it a partial fraction o plz i need the solution urgently

asked by Anonymous on July 28, 2015
92. ## chem

How many grams of ethylene glycol, HOCH2CH2OH, are present in 5.6 gallons of a 4.81 m solution with a density of 1.98 g/mL? g

asked by jan on May 2, 2011
93. ## Chemistry

I'm not quite sure what i'm doing wrong here: The Ksp for Ga(OH)3 = 7.28 X 10-36. What is the molar solubility of Ga(OH)3 in a 3.80M solution of gallium sulfate?

asked by Emily on March 22, 2011
94. ## Chemistry

calculate the pH and the pOH of an aqueous solution that is 0.035 M In HCI and 0.080 M in HBr?

asked by Josh on July 23, 2011
95. ## chem

what is the ph of a solution that results from adding 30 mL of .015M KOH to 50 mL of .015 M benzoic acid?

asked by Jess on April 17, 2012
96. ## Chem

What is the pH of the solution formed when 0.040mol NaOH(s) is added to 2.00L of 0.020M HCl?

asked by IH on November 28, 2010
97. ## Chemistry

What mass, in grams, of sodium chloride is needed to prepare 15.0 ml of 10% (m/v) NaCl solution?

asked by Irene on November 2, 2016
98. ## chemistry 12

Calculate [H3O] an [OH] for a sodium hydroxide solution having a pH of 12.5. I'm having a hard time with this i'm not sure how to start it. Please help me!

asked by Sarah on October 6, 2011
99. ## Chemistry

A 25.0-g sample of sodium hydroxide is dissolved in 400.mL of water. What is the concentration of the solution?

asked by Mayra on May 30, 2016
100. ## chem

How many mLs of a stock solution of 1 M NH4NO3 do you need to get 0.001 M of Nitrogen in 22 liters of water?

asked by andy on July 28, 2011