# 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 561
1. ## Chemistry

What volume of ethanol must be diluted with water to prepare 768 mL of 0.873 M solution? The density of ethanol is given as 0.789 g/mL. Answer in units of mL

asked by Agnes on March 8, 2013
2. ## Science

What volume of ethanol must be diluted with water to prepare 768 mL of 0.873 M solution? The density of ethanol is given as 0.789 g/mL. Answer in units of mL

asked by Agnes on March 8, 2013
3. ## BIOCHEMISTRY

Calculate the formal concentrations of acetic acid and sodium acetate necessary to prepare a buffer solution of pH 5 that is 0.20M in total acetate?

4. ## CHEMISTRY

Calculate the hydroxyl ion concentration in a solution of almond extract ofph.3.8 state wether almond is acidic or basic

asked by EUNICE on June 12, 2016
5. ## chemistry

An aqueous solution of glucose is made by disolving 8.75 g of glucose in 100 mL of water. Calculate molarity, molality and the mole fraction

asked by henry on October 7, 2013
6. ## college

he forensic technician at a crime scene has just prepared a luminol stock solution by adding 12.0 g of luminol into a total volume of 75.0 \rm mL of \rm H_2O.

asked by Anonymous on October 19, 2009
7. ## College Chemistry

how do i calculate the moles of Na2CO3 present in the original 25.00mL aliquot of carbonate solution?? the tared mass of Na2CO3 is 1.5179g

asked by Anonymous on October 2, 2012
8. ## chemistry

2.8 g of the nonvolatile solute sucrose (C12H22O11) is added to 517 g of water at 25oC. What will be the partial pressure of the water vapor over this solution?

asked by jeff on May 9, 2009
9. ## Chemistry

I need help with What is the solubility of silver oxide, Ag2O, in a solution buffered at pH 10.50? The Kc for the following equilibrium is 2.0 x 10-8. Express your answer in g/L Ag2O(s) + H2O(l) ¡ê 2Ag+ (aq) + 2OH- (aq)

asked by Tom on October 25, 2010
10. ## Chemistry

What volume of .300M HCL is required (a) to titrate 50.0 ml of 0.600 M LiOH? (B) to titrate 50.0ml of .600M Ca(OH)2 (balanced equation and solution for both please!)

asked by Gage on June 6, 2014
11. ## water chemistry

35.0 mL sample of 0.150 M acetic acid (HC2H3O2) (Ka = 1.8 x 10-5) is titrated with 0.150 M NaOH solution. Calculate the pH after 17.5 mL volumes of base have been added

asked by matsobane frans on April 12, 2014
12. ## chemistry

FIND THE PERCENTAGE BY VOLUME COMPOSITION OF A VINEGAR SOLUTION CONTAINING 10cm (TO THE POWER OF 3) OF ACETIC ACID AND 190 (TO THE POWER OF 3)OF H2O

13. ## chemistry

3. The solubility of BaSO4 at 25C is 9.04 mg/L. Based on this, how many grams and moles of BaSO4 remained dissolved in the 100 mL of solution? What percent of your yield does this represent?

asked by joan on October 23, 2011
14. ## chemistry

IONIC COMPOUNDS CONDUCT ELECTRICITY EXCEPT WHEN THEY ARE A. IN WATER SOLUTION B. LIQUID C. BILNARY COMPOUNDS D. SOLID I will be happy to critique your thinking on this.

asked by Darius Graham on January 12, 2007
15. ## Chemistry

Describe in detail a way of preparing 500 ml of solution that is 0.02500 M in sodium ions. Start with solid sodium sulfate decahydrate.

asked by Hunter on August 24, 2012
16. ## Science

What is the molar concentration of water in a solution of 10mM glucose? What types of ions are formed when water dissociates at room temp? Thank you!

asked by Tenshi on February 10, 2017
17. ## Chemistry

Calculate the molar concentration of a solution of nitric acid if 20.00 mL of the acid requires12.63 mL of 0.155 M NaOH to reach the equivalence point.

asked by Morgan on September 24, 2017
18. ## CHEMISTRY

When powdered milk is added to water, is it a coarse suspension, true solution, or colliodal dispersion? What about baking soda in water?

asked by KATIE on March 6, 2010
19. ## Chemistry

How many milliliters of .200 M NaOH solutions are needed to react with 40.0 mL of a 0.340 M NiCl2 solution? Equation: NiCl2(aq) + 2NaOH(aq) --> Ni(OH)2(s) +2NaCl(aq)

asked by elle on July 20, 2015
20. ## Science

4.9 gm of H2SO4 is mixed with Water to form 5 litres of aqueous solution. Findits concentration. (Molecular weight of H2SO4 is 98 gm/mole)

asked by Shreyash on February 23, 2017
21. ## chemistry

Balance equation for reaction occuring in basic solution. CrO4{2-}+S{2-}gives S+CrO{-} i don't know how to balance the charges in this way of balancing please teach me how to do it?

asked by mohd on April 3, 2010
22. ## gen chem 2

In the chemical kinetics experiment, determine the dilution of the stock bleach solution. The bleach used will be around 5.5% (weight/volume). Convert this to molarity

asked by jen on February 8, 2011
23. ## Math

Suppose that the half-life of a substance is 250 yrs. .If there were initially 100 g of substance .How much will remain after 500 years??with solution please

asked by Queen on August 8, 2016
24. ## Chemistry

Please can someone answer this right now for me? What is the purpose of adding conc. HCL to the solution after cyclohexene has been oxidised by KMnO4 in the reaction of Cyclohexen + KMnO4 +H2O.

asked by Elie on September 16, 2012
25. ## science

the doctor orders 0.200 mg of atropine im for you. the concentration recorded on the premixed syringe is 0.00100 g of atropine im per 10.0 mL of solution. how many mL should the nurse administer?

asked by beth on October 4, 2009
26. ## chemistry

A chemist titrates 17.44 mL of 0.346 M NaOH into a flask containing 50.13 mL of 0.179 M HCl. When the titration is complete, the pH of the solution in the reaction flask is? 12.64 .0919 1.36 2.22 11.78

asked by Anonymous on December 5, 2011
27. ## Biochem

If you had a wheat germ RNA yield of 0.213 g, how much DEPC water would you need to add to make a 20 mg/mL solution of RNA/polysaccharide mixture?

asked by shiva on October 2, 2017
28. ## chemistry

Calculatet the solubility of silver chloride in a 0.10 mol/L solution of sodium chloride at 25 degrees celsius.At SATP, Ksp AgCl(s) = 1.8 x 10^-10

asked by MiMi on March 30, 2008
29. ## Chemistry

Using the solution: NaOH + HCl yields NaCl + H20 What mass of H20 would be produced by combining 10.0 mL of each reagent? Thanks for any help; it's greatly appreciated!

asked by Elizabeth on April 25, 2012
30. ## chemistry

given that thee density of a supplied vinegar solution in an experiment is 1.025g/ml, what is the percentage acetic acid found in the vinegar sample?

asked by joy on April 20, 2013
31. ## maths

Solution of question about ladder make an angle of 60 degree with the horizontal at foot of ladder is 2.5 metre away from the wall find the length

asked by maths NCERT exampler solution on March 5, 2017
32. ## ap chem

If 26.0mL of AgNO 3 is needed to precipitate all the Cl −ions in a 0.750-mg sample of KCl (forming AgCl), what is the molarity of the AgNO 3 solution

asked by ally on September 29, 2013
33. ## Chemistry

If NaCl has a solubility of 36.0 g in 100 g of H2O at 20 °C, how many moles of water are needed to prepare a saturated solution containing 0.263 mol of NaCl at 20 °C?

asked by Laura on December 12, 2014
34. ## Chemistry

A 5.0ml sample of liquid requires 4.5 ml of a 0.093N NaOH solution. What is the titratable acidity of the liquid expressed as g/L Tartaric acid?

asked by Gordon on January 22, 2015
35. ## AP Chemistry

A total charge of 96.5 kC is passed through an electrolytic cell. What mass of copper will be produced from a copper(II) chloride solution? Answer in units of g

asked by Gabriella on September 28, 2013
36. ## chemistry

How many ml of molar sulfuric acid is to be added to 50.0 ml of 0.250 molar sodium hydroxide solution to neutralize it completely . cannot post reaction sorry ..

asked by laura on March 31, 2015
37. ## water chemistry

35.0mL sample of 0.150M acetic acid9HC2H3O2)(Ka=1.8*10-5) is titrated with 0.150M NaOH solution. calculate the pH AFTER 17.5 Ml volumes of base have been added.

38. ## Chemistry

What is the osmotic pressure in atmospheres of a 50% sucrose solution at a temperature of 37 degrees celcius with molar mass of 342.30grams of sucrose

asked by Ruffles on December 4, 2013
39. ## chemistry

Suppose that the following solution is diluted by adding the indicated amount of water. Calculate the new concentration of 225 mL of 3.02 M HCl; 375 mL water added

asked by Sandra on December 4, 2011
40. ## chemistry

what volume of 0.85M oxalic acid (C2H2O4) solution would be required to the following equation ( atomic mass C=12 ,O=16 and Na=23) A. 10.8mL C.10.8L B.108 L D.108 mL

asked by rebika on September 21, 2017
41. ## chemistry

Three solutions 40mL of 0.2M KNO3; 66mL of 0.3 M Ca(NO3)2; and 39mL 0.185M KCl were poured together to make one new solution. what is the concentration of Cl- and NO3-

asked by Anonymous on February 4, 2011
42. ## Math, data management

How many different ten digit telephone numbers contain four 2's, three 3s, and three 7s? I tried sorting the numbers out in order 2 2 2 2 | 3 3 3 | 7 7 7 10!/2!3!7! But I couldn't find the correct solution as the answer was 4200

asked by Deval on February 21, 2017
43. ## Chemistry

How do I prepare a solution of 0.0025M Fe3+ by dissolving the appropriate amount of ferric ammonium sulfate in 500 cm^3 of 0.0025M sulfuric acid?

asked by J on February 22, 2009
44. ## chemistry

what is the total mass of LiBr required to make 500.0 grams of an aqueous solution of LiBr that has a concentration of 338 ppm?

asked by Lauren on June 22, 2011
45. ## Simple Chem Help

fill in the blank. The freezing point of a solution is_____ and the boiling point is ___________ than that of a pure solvent. lower...higher?

asked by Dan on November 12, 2009
46. ## Biology

2 g of glycine (C2H5NO2) are dissolved in water to a total volume of 3 L. What is the concentration of the glycine solution in M? Round answers to two significant figures.

asked by Tori on January 16, 2017
47. ## chemistry

How many phases and components are present in a saturated solution of Na2so4 with excess of solid is present at equilibrium with its vapour in a closed vessel

asked by buhle on April 12, 2017

The concentration of iodide ions in a saturated solution of lead(II) iodide is __________ M. The solubility product constantof PbI2 is 1.4x10-8

49. ## Chemistry

What is the chemistry behind caffeine extraction with Na2SO4, CH2CL2 and NaCO3. I know that Na2SO4 some how aborbs the water from a solution leaving the undissolved soilds or something...

asked by Chonos on February 21, 2010
50. ## Science

Madeira uses the water cycle to generate electrical power but this becomes a problem during the summer. What is the problem and explain the renewable energy solution.

asked by Mileena on June 11, 2017
51. ## trig

draw the graph of 4sin(x+30) and 2+tanx for values of x from 0 degree to 360degree and obtain the solution within the range of the equation 4sin(x+30)-tan x=2

asked by mohamed kantabulah on March 19, 2011
52. ## chemistry

How many milliliters of glycerol, C3H8O3(d=1.26g/mL), must be added per kilogram of water to produce a solution with 4.85 mol % C3H8O3? Kinda lost -.-;

asked by david on February 21, 2010
53. ## chemistry

Determine the mass of NaCl in 1.0 L of 3.0 % by mass aqueous solution of sodium chloride. The density of the solutions is 1.10 gmL-1 please explain all the steps, thanks!

asked by Stacy on December 8, 2010
54. ## Crime scene chemistry

What would happen to the denisty of a plastic sample if an excessive number of air bubbles were allowed to accumulate on the plastic surface when placed into the solution?

asked by Allison on March 28, 2012
55. ## geometry

Have a couple questions: 1) what is the solution of the proportion? 5/7=m/56 possible answers; 5/8 40 1/40 8 2) the polygons are similar. The smaller one is AD=12,DC=3, the bigger one JM=40,ML=x possible answers; 17.3 10 120 160(my choice)

asked by lilman on May 23, 2012
56. ## chemistry

Give the pH of a solution containing 0.344 g of HCL in 792 mL of water. I did .344g/36.5g= .009 mols. then i times that by .792 because i changed that from ml to liters. is that right?

asked by Miley on May 15, 2008
57. ## chemistry

what is the total mass of LiBr required to make 500.0 grams of an aqueous solution of LiBr that has a concentration of 338 ppm?

asked by Lauren on June 22, 2011
58. ## chemistry

A student added 50cm^3 of 1.00 moldm^-3 sulphuric acid to 25cm^3 of 1.00 moldm^-3 sodium hydroxide. Calculate the pH of the solution formed.

asked by Amy on January 4, 2013
59. ## chemistry

Chemist needs a buffer with pH of 4.5. how many milliliters of pure CH3COOH (density;1.049g/ml) must be added to 500ml of 0.1M NaOH solution to obtain such a buffer?

asked by Heston on May 1, 2019
60. ## Chemistry

What is the percent ionization of a solution prepared by dissolving 0.0286mol of chloroacetic acid, in 1.60L of water?for choloroacetic acid, Ka=1.4x10^-3

asked by Bb on March 22, 2013
61. ## Chemistry 101

25 ml tartaric solution is tritrated with 31 ml ammonium equation rearranged for normality of ammonium: starting with N1V1=N2V2 N1= V1= v2= final answer N2=

asked by Renee on October 15, 2012
62. ## Balance each of the following redox reactions occu

Balance each of the following redox reactions occurring in acidic solution a) SO32- (s) +MNO4- ---> SO42- +Mn2+ b) S2O32-+ Cl2 ---> SO42-+Cl-

asked by Sunshine on August 5, 2009
63. ## Chem

I'm doing a vinegar titration lab and i need to know how can my acetic acid in vinegar be affected if a few droops of NaOH solution is not washed down with distilled water

asked by Sara on June 23, 2011
64. ## Science

To make a saturated solution 37 gram of aluminium chloride is dissolved in 10.0 gram of water at 293 K find it concentration and this temperature?

asked by Nasrin on May 28, 2017
65. ## chemistry

Earl N. Meyer found that it took 26.54 mL of a 0.0100 M KOH solution to reach the equivalence point for the titration of 25.00 mL of HCl. What is the molarity of the HCl?

asked by roger on March 22, 2012
66. ## Chemistry

A 0.2299 N acid is prepared by mixing 100 ml of 0.1234 N H2SO4 and 0.3200 N HCl. How much HCl is needed in the preparation of the solution?

asked by Summer on January 19, 2014
67. ## science

What volume of ethanol must be diluted with water to prepare 674 mL of 0.854 M solution? The density of ethanol is given as 0.789 g/mL. Answer in units of mL

asked by Susan on May 13, 2014
68. ## Chemistry

What mass of 3.0 wt% H2O2 solution is required to provide a 25% excess of reagent for the following reaction with 12 dietary iron tablets that contain ~15 mg of iron per tablet?

asked by Courtney on January 27, 2011
69. ## Chemistry

For How Long Must A Current Of 1.5 Ampere Be Passed Through An Aqueous Solution Of A Copper Salt During Electrolysis In Order To Deposit 2.50g Of Copper (cu=63.5)

asked by Franklin on June 27, 2017
70. ## math,correction

the problem is: 4x+y>=4 so after solving for the equation line formula y=mx+b I got : y>= -4x+4 the points to plot was: (-1,8),(0,4),(1,0),(2,-4) and the line will be solid and the shading for solution would be on top going in that-------> direction.

asked by jasmine20 on January 29, 2007
71. ## Statics

Calculate the deflection v at the free end, B, for the beams shown below. Both beams have the same rectangular cross section. Give your solution in terms of P,L,E and I.

asked by qwerty on October 23, 2014
72. ## Chemistry

By titration it is found that 76.3Ml of 0.178M of NaOH(aq) is needed to neutralize 25.00mL of HCL(aq). Calculate the concentration of the HCl solution.

asked by Katherine on April 17, 2013
73. ## Chemistry

The solubility Of KCLO is 33g per dm of water at 70 and 8g per dm of water at 20 calculate the mass of the solute which will crystallize out when 160g of the saturated solution is cooled from 70 to 20

asked by Joy on November 15, 2017
74. ## Chemistry

A technician requires a 4L of an ammonia solution to have a pH of 11.55. What volume in liters, of ammonia gas at 25 degrees Celsius and 1 atm is necessary to achieve this result?

asked by John Gold on February 23, 2010
75. ## Chemistry

For how long must a current of 1.5 ampares be passed through an aqueous solution of a copper salt .during electrolysis in order to deposited 2.50g of copper (cu 63.5)?

asked by Anita on June 4, 2019
76. ## chemistry

How many grams of copper will be deposited at the cathode of an electrolytic cell if a current of 680.0 mA is run through a 2.5 M solution of copper sulfate for 20.0 minutes?

asked by bekah on May 5, 2014
77. ## chemistry (quatatative analysis)

How many grams of Ba(IO3)2 can be dissolved in 500 mL of a 0.100 M KIO3 solution at 25 oC? Use activities for this calculation. The solubility product constant for Ba(IO3)2 is 1.57×10-9 at 25 oC.

asked by Annabelle on March 26, 2010
78. ## algebra 1

damon and bob I am not so bright. When I originally posted my question I mistakenly put an = sign where there should have been a + sign. the equation should read like this: (x^2 - 2x)(x + 3) = -2x(x + 1) What does this do to the solution now???

asked by Dippy on March 9, 2009
79. ## Chemistry

Calculate the mass of solid neded to make 500ml of solution that is 0.25m in sulfate ion, using sodium sulfate decahydrate.

asked by Emily on October 28, 2011

What mass of Na2CO3 is required to prepare 607.0 mL of 0.250 M solution? Use a molar mass with at least as many significant figures as the data given. ____g?

asked by MBH on October 3, 2011
81. ## Chemistry 110, college

A solution is prepared by dissolving 56.5g of ethylene glycol in 874 g of water. Calculate the change in the boiling point and the freezing point.

asked by Holly on April 22, 2013
82. ## college chemistry

formt he diluted unknown concentration which i found to be 1.50mg/L i have to calculate the [Fe] in the PRIMARY unknown solution... that is placed in a 250mL volumetric flask

asked by Anonymous on July 18, 2012
83. ## Chemistry

Calculate the pH of a 50.0 mL solution 0.0120 M ethylaminium chloride (C2H5NH3Cl ) and 0.0360 M ethylamine C2H5NH2. Kb = 4.3 x 10-4 Calculate the pH when 5.0 mL of 0.1 M HI is added. Ignore any changes in the volume

asked by m on April 17, 2013
84. ## chemistry

a 150ml sample of wetlands water requires 25.00 mL of a 0.0250 MH2SO4 solution for neutralization. Calculate the molarity of CaCO3 in the sample

asked by tom on April 7, 2010
85. ## Chemistry

12. Solutions cans be supersaturated if they contain more dissolved solute than saturated solutions under the same conditions.- T? 16. Heating a solution decreases the solubility of the gas in it.- T? Thanks -MC

asked by mysterychicken on October 27, 2010
86. ## Chemistry: Dilution

i need to know how to set up this problem for my finals, don't just post an answer please. How could you prepare 250mL of 0.20M NaCL using only a solution of 1.0M NaCL and water.

asked by chris on June 4, 2009
87. ## Chemistry

Suppose 500 ml of a .0035 M solution of lead nitrate is reacted with sulfuric acid. What mass of lead sulfate should precipitate?

asked by Anonymous on March 28, 2012
88. ## Science

Calculate the mass of silver deposited when a current of 2.6 A ls passed through a solution of silver salt for 70 minutes. (Ag=108; 1 faraday=96 500 c)

asked by Anonymous on May 3, 2016
89. ## Math

I made a mistake when I simplified. Find and explain my mistake. Then complete the problem correctly. Simplify:(3m^7k^-5)^-3 Solution: 3^-3 m^4 k^-8 m^4/3^3k^8 Answer:m^4/27k^8

asked by James on November 3, 2009
90. ## Math

Find the perimeter and area of a right triangle if the shortest side is 20 mm. and the longest side is 52 mm. Include correct units with each part of your solution.

asked by Geena on May 11, 2011
91. ## CHEMISTRY

How much water should be added to 45.0 mL of 0.225 M HCl to dilute the solution to 0.155 M? i did .225M x .045L / .155M = 65mL so wouldnt 20 mL be added?

asked by lyne on March 4, 2009
92. ## chemistry

Which masses of HNO3 nitric acid and water should be mixed to prepare 1000 grams of UAM 8% solution in mass of HNO3?

asked by damon on June 4, 2019
93. ## college math

Find the perimeter and area of a right triangle if the shortest side is 20 mm. and the longest side is 52 mm. Include correct units with each part of your solution.

asked by kozy on May 11, 2011
94. ## Mat 116 Algebra 1A

7[3m-(m+2)]>-6(m+3) Use set-builder notation to describe the complete solution {m|m > ? } (type an equality symbol; then type an integer or a simplified fraction.)

asked by Martin on June 16, 2011
95. ## chemistry

the solubility of Kl is 50g in 100g of H2O at 20 celcius, if 110g of Kl are added to 220g of H2O, is the soultion saturated or unsaturated? and what is the %m/m of the solution?

asked by mandy on November 16, 2011
96. ## Chemistry

Sodium sulfate is slowly added to a solution containing 0.0500 M Ca2 (aq) and 0.0290 M Ag (aq). What will be the concentration of Ca2 (aq) when Ag2SO4(s) begins to precipitate?

asked by Neeta on April 11, 2014
97. ## ochem

Consider a sample that is a mixture composed of biphenyl, benzoic acid, and benzyl alcohol. Predict the order of elution of the components in this mixture on the TLC plate when solvent system a, b or c is used. a)Cyclohexane: Methylenechloride:100%:0%

asked by bez on May 7, 2013
98. ## Math

1) An aerobics class is being offered at the ABC body gym. Nonmembers pay $4 per class while member pay a monthly fee of$10 plus \$2 per class. a. Create a linear system to represent the two options. b. At how many classes will the cost be the same? What

asked by Kevin on October 13, 2014
99. ## College Physics

A 27.7-cm-by-27.7-cm checkerboard has a mass of 103.1 g. There are four 27.7-g checkers located on the checkerboard, as shown in the figure. Relative to the origin located at the bottom left corner of the checkerboard, where is the center of mass of the

asked by Kimmy on October 20, 2013
100. ## Physics - Center of Mass

A 32-cm-by-32-cm checkerboard has a mass of 120 g. There are four 19-g checkers located on the checkerboard, as shown in the figure. Relative to the origin located at the bottom left corner of the checkerboard, where is the center of mass of the

asked by Newman on June 16, 2012