# 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

91,718 questions, page 189
1. ## chemistry

To what volume should you dilute 48mL of a 13M stock HNO3 solution to obtain a 0.122 HNO3 solution?

asked by Anonymous on October 2, 2010
2. ## Chemistry

A solution of concentrated NaOH is 16.7M. If the density of the solution is 1.02 g/mL, what is the percent by mass of NaOH? I have tried different calculations and molarity and % but im not catching on at all

asked by Anonymous on October 28, 2016
3. ## Chemistry 103

To what volume should you dilute 50ml of a 13M stock HNO3 solution to obtain a 0.131M HNO3 solution?

asked by YeJi on October 7, 2012
4. ## Chemistry

A solution of NaOH was obtained by dissolving 5.6g of NaOH pellets in 100cm^3 of water. What is the concentration of resulting solution?

asked by HandsomeLala on October 19, 2012
5. ## college gen chem

A quantity of 16.13 mL of a KOH solution is needed to neutralize 0.4883 g of KHP. What is the concentration (in molarity) of the KOH solution?

asked by han on March 2, 2009
6. ## Science

what is the concentration (M) of a MgCl2 solution prepared by dissolving 7.2 g of MgCl2 in sufficient water to give 362 mL of solution?

asked by Eli on November 4, 2014
7. ## Chemistry

A solution contains 0.55 g of dissolved Sn 4+ ions. How many grams of Na2CO3 must be added to the solution to completely precipitate all of the dissolved Sn4+?

asked by Anna on April 23, 2012
8. ## chemistry

An aqueous solution contains 64g of ethanol( C2H5OH) in 122 grams of solution. The mole fraction of ethanol is:

asked by anon on March 15, 2015
9. ## Chemistry

What is the molarity of H2SO4 in a solution prepared by adding 15.0 mL of 6.0 Molarity H2S04 to enough water to make 100.0 mL of solution?

asked by Andrea on October 5, 2011
10. ## chemistry honors

how many grams of a stock solution that is 85% H2SO4 by mass would be needed to make 150 grams of a 45.0 percent solution?

asked by jimmy on September 30, 2010
11. ## Chemistry

The intravenous dosage of mannitol is 1.5g/kg, administered as a 15% mv solution. How many ml of the solution should be administered to a person with a body mass of 85kg?

asked by Mike on February 21, 2011
12. ## Science

if one third of 100g of 27% aqueous sugar solution is taken in a beaker and 10g of sugar is added to it , the concentration of the resulting solution will be?

asked by Shivangi on November 20, 2015
13. ## Chemistry

If a 25.0 mL sample of 0.500 M HCl solution were diluted 125-fold, what would be the volume and concentration of the diluted solution?

asked by Chris on April 4, 2011
14. ## Chemistry Acid Question Ka

Enough of a monoprotic acid is dissolved in water to produce a 0.0165 M solution. The pH of the resulting solution is 2.38. Calculate the Ka for the acid.

asked by RZeal on April 22, 2012
15. ## Chemistry

Enough of a monoprotic acid is dissolved in water to produce a 0.0190 M solution. The pH of the resulting solution is 2.33. Calculate the Ka for the acid.

asked by Ann on March 26, 2013
16. ## chemistry

A quantity of 12.75 mL of a KOH solution is needed to neutralize 0.5109 g of KHP. What is the concentration (in molarity) of the KOH solution?

asked by Alex on March 3, 2011
17. ## chem 1

a NaOh solution has a concentration of about 0.11M.How many grams of KHP would have to be used to require NaOH solution to reach the endpoint

asked by karen on November 7, 2011
18. ## Chemistry

The density of a 1.0 M solution of NaCl is 1.04 g/mol and its specific heat, c, is 3.60 J/C*g. How much heat is absorbed by 31.4 mL of this solution if the temperature rises from 18.6 C to 29.7 C?

asked by Sarah on October 19, 2010
19. ## chemistry

You have a 250ppm solution of K with KCl, you want to prepare a 0.00100 mole of Cl, how many mililiter should be diluted to prepare 1 liter of solution

asked by wallace on August 10, 2018
20. ## chemistry

A solution of CaCl2 is prepared by dissolving 1.004 g of the solid in approximately 30 mL of water. How many moles of CaCl2 does this solution contain?

asked by malika on June 11, 2017
21. ## chemistry

25.0 ml of 15% NH4NO3 solution is diluted to 300.0 ml. What is the concentration of the diluted solution? .15% x 25=3.75ml Do I divide by 300ml and that's my answer?

asked by Claire on April 16, 2015
22. ## Chemistry

A 1.0L of an aqueous solution of ethylene glycol, HOCH2CH2OH, is 60% HOCH2CH2OH by mass and has a density of 1.15 g/mL. Calculate the morality of the solution.

asked by Ayaka on May 24, 2016
23. ## Chemistry

A solution of concentrated NaOH is 16.7M. If the density of the solution is 1.02 g/mL, what is the percent by mass of NaOH? I have tried different calculations and molarity and % but im not catching on at all

asked by Anonymous on October 28, 2016
24. ## chemistry

If the solubility of a particular solute is (10 g/100 g H2O) at 20°C, what solution concentration would represent a supersaturated aqueous solution of that solute?

asked by ashley on February 8, 2011
25. ## chemistry

The vapour pressure of pure water at 760 mm at 25 degree celcius. The vapour of solution containing 1m solution of glucose will be.

asked by munaf on May 11, 2016
26. ## Chemistry

How much cm3 solution of concentrated ammonia with 25% density of 0.91g/cm3 should be added to 7 g NH4Cl so we can get a solution of 100cm3 with pH 10 (Kb = 1.8 x 10-5)

asked by HelpPls on June 11, 2013
27. ## Math

If the pH of a solution increases by 4 (from 4 to 8), how much does the hydrogen ion concentration change? Does the change make the solution more acidic or more basic?

asked by Sam on October 17, 2012
28. ## applied chemistry

A 50.0mL volume of AgNO3, solution contains 0.0285 mol AgNO3 (SILVER NITRATE). What is the molarity of the solution?

asked by jose on March 7, 2012
29. ## Chemistry

1) Give an example of a buffer solution? 2) Explain how the buffer solution named in 1) resists changes in pH when an acid or alkali is added to it.

asked by Keke on April 5, 2019
30. ## chemistry

sorry,for the mistake. To 200mL of a 0.1M solution of a CH3COOH (Ka=1.8 x 10-5) 70mL of a 0.2M solution of NaOH have been added.calculate the pH before and after the NaOH addition.

asked by Anonymous on June 27, 2016
31. ## chemistry

What are the concentrations of all the solute species in a 1.2 M solution of acetic acid, HC2H3O2? (a) [H3O+], M; (b) [OH-], M; (c) [CH3COOH], M; (d) What is the pH of the solution? For CH3COOH, Ka = 1.8 x 10-5

asked by Lozz on August 20, 2010
32. ## chem

Calculate the pH of the buffer that results from mixing 50.8 mL of a 0.493 M solution of HCHO2 and 13.0 mL of a 0.646 M solution of NaCHO2. The Ka value for HCHO2 is 1.8×10−4

asked by Kiki on November 6, 2015
33. ## Chemistry105

A 10.00 mL volume of sulfuric acid required 23.65 mL of NaOH solution for complete neutralization. What is the molarity of the acid solution?

asked by Mira on December 18, 2012
34. ## Chemistry

Household ammonia contains 0.85 g of NH3 in each 100. mL of solution. What is the molarity of the ammonia solution? (atomic masses: N = 14.01, H = 1.008)

asked by Abby on November 3, 2014
35. ## chemistry

A solution contains 0.02755 g of a protein in 25.0 mL of solution. The osmotic pressure is 3.22 torr at 298 K. What is the molecular weight of the protein?

asked by m on February 17, 2013
36. ## Chemistry

You have .8 liters of a 0.5M HCl solution. If you use this solution to complete a decomposition reaction of HCl how many moles of hydrogen (H2) would be produced?

asked by John on April 2, 2013
37. ## Chemistry

if an aqueous solution of BA(NO3)2 is added to 1.0 L of a solution containing 0.05 mol F- and 0.075 mol SO4 2-, which salt will precipitate first?

asked by Matt on April 26, 2010
38. ## chemistry

A 0.8743 g sample of KHP was titrated 42.45-mL of NaOH solution until the phenolphthalein endpoint. What is the molarity of the NaOH solution?

asked by Anonymous on January 21, 2015
39. ## College Chemistry

A solution is saturated in both nitrogen gas and sodium iodide at 50 degrees C . When the solution is cooled to 25 degrees C what is most likely to occur?

asked by Brandy on March 23, 2014
40. ## Chemistry

Why did you need to know the density of the bleach solution? Why didn't you measure the density of h2o2 solution as well? Stoichiometry lab problem

asked by HELP PLEASE on October 28, 2012
41. ## Chemistry

You are given 21.0 mL of a 5.00% solution of NaOH. The solution has a density of 1.02 g/mL. What volume of 0.0895M H2SO4 will you need to completely and exactly react (neutralize) the NaOH?

asked by Kelly on October 22, 2014
42. ## Physics

An intravenous blood plasma drip enters a vein in the patient’s arm from a bag raised a height h above the vein. If the diameter of the 5 cm long needle is 0.5 mm, use Poiseuille's law to find the height h that results in a 5 cm3/min flow rate. (Assume

asked by Jacob Dover on January 18, 2013
43. ## Chemistry

If the pH of a Ca(OH)2 solution is measured as 9.0, what is the concentration of the Ca(OH)2 solution? 1 × 10-5 M 1 × 10-9 M 1 × 10-8 M 1 × 10-6 M

asked by Summer on April 11, 2018
44. ## science

No more solute can dissolve in a solution if it is a--------solution.

asked by gay on January 7, 2009
45. ## Chemistry

you have a solution of 0.1 m KCN and a solution of 0.1 m of HF what is the buffer?

asked by Jennifer on March 16, 2017
46. ## Chemistry

The PH of an aqueous solution of NaCN is 10.38. What is [CN-] in this solution?

asked by ChemHurts on August 10, 2009
47. ## algebra

Determine whether -4 is a solution of the inequality x>-4 Is -4 a solution?

asked by Tina on May 20, 2011
48. ## MAth answer check

One solution of kx^2 +6x-k=0 is -3. Find the other solution I have the answer as -1/3 is this right?

asked by Shawn on November 10, 2008
49. ## Chemistry

If 0.45 M of ammonia solution has a pH of 9.20, what is the H+ concentration of the solution?

asked by Anna on January 10, 2015
50. ## Chem/bio question

HA is an acid that ionizes in 10% in solution. what is the [h+] of a 0.01 m solution of ha?

asked by Karina on September 16, 2015
51. ## chemistry

what is diluted solution and concentrated solution?

asked by berry on July 25, 2017
52. ## Math

Does |x^2-3x+3|=3 have a solution? My answer was that there isn't a solution. Am i right?

asked by Unknown. on August 17, 2012
53. ## algebra

I need help with these please. What is the solution for 0.7x+5¡Ü1.1x-8? What would be the solution for, 15a+5b-12a-8b=

asked by C on June 2, 2008
54. ## chemistry

what is the molarity of a solution containing 15.0 g of NaCl in 1.25 L of solution?

asked by lucky on May 22, 2011
55. ## algebra

Please help!!! Determine whether -10 is a solution of the equation 6(x-2)= -70 Is -10 a solution? Thanks for your help

asked by thawk on November 8, 2010
56. ## Math

Is x+3=2y and x=2y-3 have infinitely solutions or one solution or no solution

asked by Math on March 29, 2017
57. ## Chemistry

I have a .01 M solution of N2, and the concentration of H2 in the same solution is .02. What is the Ksp.

asked by Elizabeth on April 24, 2016
58. ## Chemistry

consider 1.0 L of a solution which is 0.55 M HF and 0.2 M NaF (Ka for HF = 7.2 x 10-4), Calculate the pH of this solution

asked by Chris on November 30, 2012
59. ## Science- Calorimetry

Are the "q" solution and the "delta H" solution always equal?

asked by Kathy on August 20, 2018
60. ## Chemistry

If the pOH of a solution is determined to be 5, what is the pH of the solution?

asked by Tia on April 28, 2011
61. ## Chemistry

Consider a 9.5e-10 M solution of HClO4 at 283 K. What is the pH of the solution?

asked by Chris on December 7, 2012
62. ## Chemistry

How would you prepare 2.15 L of a 8.00 M solution from a 12.0 M stock solution?

asked by wonder on December 2, 2016
63. ## algebra

What's the solution to 5n+1=5n-1. Please tell me if it's no solution or all real numbers or something else.

asked by Cristine on September 29, 2009
64. ## chem

im studying for a test and i have no idea where to even start for this practice problem..?? a 0.15M(molarity im assuming)solution of BrCl2 contains.. a).15MBr2+ ions and .30M Cl- ions b).30MBr2+ ions and .15M Cl- ions c).15MBr2+ ions and .15M Cl- ions

asked by hannah on March 27, 2011
65. ## Chemistry------DrBobb..

Lead metal is added to 0.140 Cr^3+(aq). Pb(s)+ 2Cr^3(aq) Pb^2+(aq)+2Cr^2+(aq) KC=3.2*10^{-10} A. What is Pb^2+ when equilibrium is established in the reaction? B. What is Cr^2+ when equilibrium is established in the reaction? C. What is Cr^3+ when

asked by Saira on February 7, 2009
66. ## Help

In the tradition of their Native American ancestors, Decorah Custom Canoes specializes in creating handcrafted canoes using the finest natural materials. Whether they are from birch bark or cedar, all canoes are custom-built from native wood. Each piece is

asked by Peg on July 28, 2014
67. ## Math

In the tradition of their Native American ancestors, Decorah Custom Canoes specializes in creating handcrafted canoes using the finest natural materials. Whether they are from birch bark or cedar, all canoes are custom-built from native wood. Each piece is

asked by Peg on July 19, 2014
68. ## Social studies 8th grade

What was described as the "hardest work" slaves did? A) work in the rice fields B) we're going to tobacco fields ** C) working the lumber business D) Work loading and unloading ships in port 2. Which of the following best describes the social class of the

asked by Help, and check answers please on February 4, 2016
69. ## math

Help pllsss ASAP!!! have certain answers!! i try but i do not understand! help asap! give answers and walkthrough problems for me! 1. 2(x - 3) = 2x (1 point) one solution no solutions infinitely many solutions 2. 3(y - 3) = 2y - 9 + y (1 point) one

asked by ... on January 2, 2014
70. ## Analytical Chem

Determine [Zn2 ], [CN–], and [HCN] in a saturated solution of Zn(CN)2 with a fixed pH of 2.390. The Ksp for Zn(CN)2 is 3.0 × 10–16. The Ka for HCN is 6.2 × 10–10. I know the following is what needs to be done, but im unsure of how to go about it.

asked by Anonymous on September 16, 2014
71. ## Calculus

Let A denote the portion of the curve y = sqrt(x) that is between the lines x = 1 and x = 4. 1) Set up, don't evaluate, 2 integrals, one in the variable x and one in the variable y, for the length of A. My Work: for x: âˆ«[4,1] sqrt(1+(dy/dx)^2) dy/dx =

asked by Daisy on January 25, 2017
72. ## Chemistry

the activation energy for the decomposition of HI(g) to H2(g) and I2(g) is 186kj/mol. the rate constant at 555k is 3.42 x 10^-7 L/mol*s. What is the rate constant at 645K? Please show all steps USING THE ARRHENIUS EQUATION. Here is my work so far: K = A

asked by Jim on October 26, 2010
73. ## Chemistry

The reaction between 0.045 g of calcium with an excess of water was carried out in an ice calorimeter as used in this lab. The volume of water in the calorimeter decreased by 0.18 mL during the reaction a) Write the equation for the reaction which occurs.

asked by Sean on June 3, 2009
74. ## Maths

A curve has equation y = 10 + 8x + x^2 - x^3. X >= 0 a)Find the coordinates of the turning point. and show whether it is maximum or minimum. b) Hence, Find the area of the region bounded by the curve, the line y = 11x and the y axis? I manage to complete

asked by kale on November 20, 2016

A student placed 10.5g of glucose (C6H12O6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.- mL mark on the neck of the flask was reached. The flask was then shaken until

asked by anonymous on February 12, 2009
76. ## chem

A student placed 12.5 of glucose (C6H12O6) in a 100ml volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the calibration mark on the neck of the flask was reached. The flask was then shaken

asked by tomi on March 12, 2009
77. ## Chemistry HELP!

A student placed 10.5g of glucose (C6H12O6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.- mL mark on the neck of the flask was reached. The flask was then shaken until

asked by anonymous on February 12, 2009
78. ## Psychology

compare and contrast the strengths and weaknesses of two different approaches to study the following issue: You have developed a new drug that you believe is effective in reducing appetite. As a result of some preliminary research, you have been given a

asked by Robert on August 14, 2011
79. ## Art

Could you please check if everything is correct? Thank you. 1) In 1986, Eric Drexler published “Engines of Creation”, a scientific dissemination in which shows not only the theoretical bases of nanotechnology, but also a series of speculation about the

asked by John on June 11, 2012
80. ## help!!!Urgent english

I have a question.If you have employment,are you looking for work? Pleaase answer quicky........It is due on 22/06/05. Sandy You can have employment but still be looking for another job or advancement in the same area. On the other hand, you can be

asked by Sandy Tang on June 20, 2005
81. ## Math precal

Show that ab= 1/2 [(a+b)^2 - (a^2+b^2)] Show how's its done i want to learn thank u

asked by Shelby on January 10, 2013
82. ## Math

Show your thinikng, the more you show the more you know

asked by Anonymous on September 21, 2009
83. ## AP Physics

Two identical, small balls are suspended by separate 0.25m threads that are attached to a common point on the ceiling. Each ball has a mass of 8.0 x 10^-4 kg. Initially the balls are uncharged and hang straight down. They are then given identical positive

asked by Ben on April 13, 2016
84. ## PreCalc

y =( (C-A)/2 ) sin( (X - (A - ( (C - A)/2 ) ) )( pi/(C-A) ) ) + (B - ( (B-D)/2 ) How do I rearange this for this equation for the all of the variables including A, B, C, D, X were pi is the greek leter pi if you didn't notice this is the general formula

asked by Jo on December 7, 2009
85. ## Calculus

I apologize if this question is too much to ask on this site, but I am really confused. Any help would be greatly appreciated. The famous formula shown below is called Euler’s formula, after the Swiss mathematician Leonhard Euler (1707-1783). e^(a + bi)

asked by Sade on November 7, 2016
86. ## economics

To save on gasoline expenses, Edith and Mathew agreed to carpool together for traveling to and from work. Edith preferred to travel on I-20 highway as it was usually the fastest, taking 25 minutes in the absence of traffic delays. Mathew pointed out that

asked by sugar on May 25, 2013
87. ## Chemistry

Consider a chromium-silver voltaic cell that is constructed such that one half-cell consists of the chromium, Cr, electrode immersed in a Cr(NO3)3 solution, and the other half-cell consists of the silver, Ag, electrode immersed in a AgNO3 solution. The two

asked by TP on May 12, 2014
88. ## English

Pansori is a kind of Korean folk play. 1. Bill is doing pansory at the school talent show. 2. Bill is presenting pansory at the school talent show. 3. Bill is acting out pansory at the school talent show. (Q1: Which one is correct in the sentences above?

asked by rfvv on April 7, 2013
89. ## Stats

2 samples were collected to determine whether there was a difference between two weight loss methods targeting men. The average weight loss method is provided for the 2 samples along with the respective standard deviations. Is the second method - with an

asked by Jason L on February 23, 2007
90. ## Chemistry

During the preparation of K3[Al(C2O4)3].3H2O, NaOH was added slowly and with stirring over an approximately 10-minute period to a solution of Al2(SO4)3 solution. The combined solution was heated to almost boiling and left to stand for a few minutes. 1. Why

asked by Alan on March 22, 2010
91. ## chemistry

Given a balloon you have at home, to determine the barometric pressure in your area. Record the pressure below. Your balloon contains 22 grams of Carbon dioxide. Use the following link to determine the temperature in your area. and then use the following

asked by amy on June 1, 2012
92. ## Statistics

In a population of 240 women,the heights of the women are normally distributed with a mean of 64.2 inches and a standard deviation of 3.2 inches. If 36 women are selected at random, find the mean mu x and stand deviation sigma x of the population of sample

asked by Joe on November 8, 2011
93. ## Science

1-Which of the following is not a function of the circulatory system? D-fights infection 2-Which of the following explains why the heart is organized so that it pumps blood to two different locations? D-to provide a way for blood to pick up nutrients at

asked by Rodco on March 20, 2014
94. ## Math _Algebra Word Problem

Please show equation and solve for the following 1. Lyn's age is 8 years less than 15 times the age of her niece Elizabeth. If the sum of their ages is 24, what is Elizabeth's age ( Let e= Elizabeth's age) 2. Bob is renting a canoe for \$20, plus \$9.75 per

asked by DMAR on September 23, 2009
95. ## Differential equation

A first order linear equation in the form y′+p(x)y=f(x) can be solved by finding an integrating factor μ(x)=exp(∫p(x)dx) (1) Given the equation (x+4)^2y′+5(x+4)y=16 find μ(x)= I found it to be e^(5ln(x+4))which is correct** (2) Then an explicit

asked by Joe on June 15, 2015
96. ## Physics

A cable exerts a constant upward tension of magnitude 1.82 ✕ 104 N on a 1.60 ✕ 103 kg elevator as it rises through a vertical distance of 2.90 m. Find the work done by the tension force on the elevator (in J). Find the work done by the force of gravity

asked by Anonymous on October 12, 2018
97. ## Economics

(iii) Bright Future, Ltd (BF) is a nonprofit foundation providing medical treatment to emotionally distressed children. BF has hired you as a business consultant to design an employment policy that would be consistent with its goal of providing the maximum

asked by Michelle on May 26, 2011
98. ## calculus

Please help me solve this equation. log(3)+log(x)=log(5)+log(x-2) 1. Solve equation by setting up algebraically. 2. Use appropriate properties of Logarithm to reduce the number of logarithmic terms to only one. 3. Solve logarithmic equation.

asked by Marie on February 16, 2011
99. ## Geometry

Can someone show me how to solve this? Someone tried to explain it to me-I didn't get it.A line contains the points (3, -4) and (5, 2). Another line graphed in the same coordinate plane contains the points (0, 5) and (-2, -1). Based on the slopes of these

asked by Jim on July 24, 2007
100. ## Chemistry

This is a back titration question and I'm struggling with it :/ So if you can help me, that would be very appreciated :) Q. A sample of steel wool was dissolved in excess sulfuric acid. The resulting solution (FeSO4 aq) was then titrated with potassium

asked by Rapunzel on February 27, 2013