# 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 622
1. ## chemistry

What mass of solute is dissolved in 250.ml of 4.00%m/v solution. I am confused what to do.in response to question 2 of my other question it asking for volume of the solute.

asked by kody on July 18, 2014
2. ## chemistry

Calculate the molarity of a phosphoric acid(H3PO3)solution that is 84% by mass phosphoric acid and has a density of 1.87g/mL.?

asked by Lahna on July 2, 2011
3. ## chemistry

3. a) Calculate the pH of the buffer solution prepared by mixing 40.0 mL of 0.100 M H3PO4 and 60.0 mL of 0.100 M KH2PO4. Given the pKa of H3PO4 is 2.12.

asked by Syah on March 15, 2014
4. ## Science

Determine the mass % (m/m) of a NaCl solution if 58.5 grams of NaCl was dissolved in 50 ml of water (assume the density of water to be 1.0 g/ml).

asked by Ravisha on March 20, 2019
5. ## Math

How many real number solutions does the equation have? y=3x^2-5x-5 A)one solution B)two solutions C)no solutions D)infinitely many solutions I can't figure this question out. Any help would be amazing.

asked by Sasha on June 1, 2015
6. ## chemistry

calculate the PH at the 60ml of .200M aniline (kb=3.2x10^-6) with .200M HNO3 solution before acid is added after 0,19,70 ml of HNO3

7. ## Chemistry

Find molality of a solution containing non - volatile solute if its vapour pressure is 2% below the vapour pressure of pure water

asked by Jashan Gill on February 1, 2013
8. ## science

If the solution is saturated at 100 degrees Celsius and then cooled to 30 degrees Celsius, how many grams of solute will precipitate out?

asked by Troy on October 26, 2015
9. ## Chemistry

Acetic acid has a pK of 4.8. How many mL of 0.1M acetic acid and 0.1M of sodium acetate are required to prepare 1 liter of 0.1M buffer solution having a pH of 5.8?

asked by Barb on September 14, 2011
10. ## geometry

solution of the questions The sides of a quadrilateral ABCD are 6 cm, 8 cm, 12 cm and 14 cm (taken in order) respectively, and the angle between the first two sides is a right angle. Find its area.

asked by Anonymous on August 22, 2014
11. ## clinical chem

How many grams of hydrated MgSO4 ⋅ 5 H20 (M.W.: MgSO4 = 119, H20 = 18) are required to make a 10% solution of MgS04

asked by Bridget on January 22, 2018
12. ## math

solution of the questions The sides of a quadrilateral ABCD are 6 cm, 8 cm, 12 cm and 14 cm (taken in order) respectively, and the angle between the first two sides is a right angle. Find its area.

asked by sanjaivnair on August 22, 2014
13. ## Chemistry

How long will it take to deposit all the copper in 300 ml of 0.300(m) copper sulphate solution using current of o 0.750 ampere?

asked by Riya on January 7, 2019
14. ## chemistry

287 mL of a 2.93 m solution of sodium bicarbonate reacts with iron (II) phosphate. How many moles of iron (II) bicarbonate are formed?

asked by Victoria on March 5, 2012
15. ## chemistry

I'am unable to identify which is upper meniscus and lower meniscus while taking a solution in burette.please tell me how to identify it easily.

asked by J.Nandhini on September 25, 2012
16. ## Science

How much quantity of sodium chloride is needed to make 30 ml of a 2% isotonic drug (sodium chloride equivalent 0.20) solution? A. 0.60 B. 0.15 C. 0.27 D. 0.12

asked by Abhishek chouhan on July 4, 2014
17. ## physics

A car travel a distance of 8 km frome P to Q then moves 6 km at right angles to PQ .Find its travel distance and displacement Solution

18. ## Chemistry

If the temperature of a solution goes from 27 degrees celcius to 36 degrees celcius for a 5,0 g sample, how would you determine the energy produced by the reaction?

asked by Roberta on April 27, 2010
19. ## physical science

Hypothesize how the pH of white vinegar would change if an ammonia solution was added to it a drop at a time. White vinegar has a pH of 3.1

asked by Roxana on March 2, 2013
20. ## science

Explain briefly how pure dry crystals of calcium chloride could be obtained from a solution of calcium chloride.

asked by Assan Joof on May 7, 2016
21. ## chemistry

Calculate the hydroxide ion conc. and the % ionization @20oC in a 1.25 M NH3 solution. The Kb for NH3 = 1.70x10-5 @20oC.

asked by bob on June 10, 2010
22. ## Algebra

What is the value of b in the triangle shown below? The triangle they are showing is a right triangle...the length is 3b and the width is b...on the inside of the triangle it says 24in^2. A.–4 in B.4 in C.±4 in D.no solution Please help I do not know

asked by Cassie on February 25, 2013
23. ## Chemistry

What is the concentration, in w/w%, of a solution prepared from 50.0 grams NaCl and 150.0 grams of water? I think it would be 25.0%, but I'm struggling with these new concentration calculations.

asked by Ann on November 29, 2010
24. ## chemistry

What are the concentrations of [H+] and [OH-] in each of the following. Determine the pH and pOH for each solution. A. 1.25 M HCl B. 0.25 M NaOH C. 0.035 M Ca(OH)2 D. 0.50 M HNO3 I know how to do the pH and pOH I just do not know how to figure out the both

asked by Anna on April 28, 2010
25. ## Chemistry

how many grams of potassium bromide could be recovered by evaporating 650 grams of 15 perentKBr solution to dryness...... 650 * (.15) = 97.5

asked by Pierre on October 25, 2010
26. ## chemistry

how many grams of ethyl alcohol are needed to produce 1 L of a 2 mM solution if 1 mole =46g of ethyl alcohol. how do you calculate?

asked by Chris on February 7, 2010
27. ## chemistry

how to prepare approximately 100 ml of a .12M copper (II) chloride solution using a 50.5% by mass copper (II) chloride that has a density of 1.05 g/ml

asked by ste on February 3, 2011
28. ## chemistry

Calculate the pH of a 195 mL solution containing 7.50g of ethylamine (CH3CH2NH2) and 7.50g of ethylammonium bromide (CH3CH2NH3+ Br-). The Kb of ethylamine is 4.7 x 10-4

asked by z on March 7, 2013
29. ## Chemistry

How to prepare 50ml 0.04N H2SO4 from solution 0.025N sulfuric acid by adding 0.4N sulfuric acid

asked by Manoj on May 25, 2017
30. ## chemistry

1. State one property in which a solution of sugar in water resembles a mixture of sugar and sand, and one property in which it differs from it?

asked by Rupali on September 14, 2010
31. ## Math

solution of a rectangular swimming pool 8m long and 5m wide has 0.5 m wide path around it . find area of path

asked by Sapna on December 17, 2016
32. ## math

find the solution of (x2-y2)dx + 3xydy =0 Please help me to find the right answer,I sovled many ways but I don't get the right one with answer key. Thank you so much in advance

asked by lyn on November 18, 2011
33. ## math

25% of water is evaporated from 10 litres of water containing 150 gm of common salt, the % of salt in remaining solution is increased by how much?

asked by anoop on August 1, 2017
34. ## Chemistry

According to the balanced equation below, how many moles of KBr will be made from 30.0 mL of 1.00 M HBr solution? HBr(aq) + KOH(aq) --> H2O(I) + KBr(aq)

asked by Minset on October 12, 2015
35. ## Chemistry

How do you Find the mass (in g) of Carbon in 2.980 g Carbon dioxide? I saw the question asked before but couldn't find a solution.

asked by Karen on February 12, 2016
36. ## Chemistry

The solubility of KI in ethyl alcohol is 2.00 grams of KI in 100.0 grams of this alcohol. From this information, calculate the molarity of this solution.

asked by Anonymous on October 26, 2016
37. ## Algebra

compound inequality write the solution set using interval notation and graph -7x+1>=15 or 5x+3>=-17 -1 -1 -3 -3 -7x/-7>=14/-7 5x/5>=-20/5 x>=-2 x>=-4 {-2,sideways8) {-4,sideways8) On my graph I have a { at -2 Does someone know how to do this?

asked by Tim on March 21, 2008
38. ## chemistry

'A patient receives 2900mL of an IV solution containing 3g of glucose per 100 mL. How much energy, in kilocalories, does the patient obtain from glucose?

asked by Anonymous on September 3, 2014
39. ## Chemistry

Ok so you have 50mL of sucrose and 977mL of buffer solution - after equilibrium the concentration of sucrose is 0.48M - what is the concentration before hand? How do you do this??

asked by Sarah on April 11, 2010
40. ## physical chemistry

calculate the mass of NaCl needed to prepare 1000cm of 0.025M solution (molar mass of NaCl is 58.5)

asked by Anonymous on November 28, 2015
41. ## Chem

A 0.649 m aqueous solution of a monoprotic acid (HA) freezes at -2.34°C. Find the pKa of this monoprotic acid. Kf of water = 1.86 °C/m

asked by Carlos on June 4, 2017
42. ## Chemistry

Calculate the change in pH when 5.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq).

asked by Mandy on December 5, 2013
43. ## natural product 2

: Chloral hydrate solution is prepared by dissolving ____gms of solid chloral hydrate in 20ml water

asked by ravi avaiya on August 3, 2013
44. ## Chemistry

The molar heat of solution of NH4NO3 is 25.7 kJ/mol. How much heat (in kJ) would be required to dissolve 20 grams of NH4NO3 in water?

asked by Hannah on December 14, 2010
45. ## chemistry

What volume (L) of an aqueous solution that is 24.00 % by mass ammonia (NH3) and has a density of 0.910 g/mL must be taken to obtain 61.2 g of ammonia (NH3) ?

asked by axl on October 1, 2010
46. ## chemistry

.70 L of a buffer solution that is 0.120 M in NH3 and 0.450 M in NH4Cl are diluted to 5.80 L with distilled water. What is the pH of the buffer? Kb of NH3 = 1.8 x 10^-5

asked by kim on October 8, 2010
47. ## math

a 33 long rod is to be divided into three parts, each of which is progressively longer than the next part by 2 cm. how long is each part? solution pls.

asked by HyoSun on January 13, 2015
48. ## Chemistry

it takes 37.50 mL of 0.152 M sodium chromate to titrate 25.00 mL of silver nitrate. what is the molarity of the silver nitrate solution

asked by Kendra on November 15, 2012
49. ## chemistry

Calculate the mass of barium chloride you need to make a 0.200 m barium chloride solution with 100.0 g of water.

asked by hereyago on April 19, 2012
50. ## Science, chemistry

During the experiment, 100ml will be required to prepare 0.5M solution of NaNO3. Calculate the mass of NaNO3 in grams that will be required.

asked by Hilen on August 30, 2016
51. ## Chemistry

lactic acid has a pKa of 3.08. What is the approximate degree of dissociation of a .35M solution of lactic acid? I do not know how to start it thanks!!

asked by Rose on April 21, 2009
52. ## Algebra

The only solution to sqrt (2x+3) - sqrt(x+1) = 1 is x = 3 I think that is true but I'm not sure if I was suppose to separate this equation I just put the 3 in the place of the x and it was true but should I have done it differently?

asked by Mellie on January 7, 2011
53. ## Chemistry

The resulting pH of a solution when 100 mL of 0.877 M NH3 is mixed with 100 mL of 0.481 M HBr is ___. For NH3, Kb = 1.8 × 10−5.

asked by Anonymous on May 5, 2017
54. ## College Algebra

Graph the inequality on the numberline and then write it in interval notation. 6x+5(x+5)≥7x+45 and 12x+4(x-3)

asked by Anonymous on September 6, 2017
55. ## chem

If an albumin solution replaces starch inside the dialysis tube, would it be detected in the liquid outside the dialysis tube

asked by prince on November 13, 2012
56. ## chemistry

how many grams of potassium nitrate are needed to prepare 250.0ml of a 0.03M potassium nitrate solution?

asked by jen on November 12, 2016
57. ## chemistry

Calculate the volume of 2.0 mol dm^-3 sulphuric acid,H2SO4 needed to prepare 2.5 dm^3 of 0.5 mol dm^-3 of the same acid solution.

asked by mandy on May 5, 2014
58. ## Chemistry

A 100.0 mL sample of 0.20M HF is titrated with 0.10M KOH. Determine the pH of the solution after the addition of 100.0 mL of KOH. The Ka of HF is 3.5 x 10^-4

asked by Alex on April 7, 2011
59. ## chemistry

calculate the volume in milliliters of 3.6 mol/L sodium nitrate solution that contains 325 mmol of sodium nitrate

asked by Mal on March 8, 2011
60. ## Maths,physics,biology,english,arabic,chemistry

Calculate the mass of NaOH required to make 500ml of 0.5 M aqueous solution (Molecular mass of NaOH=40)

asked by Fathima on July 29, 2017
61. ## Chemistry

NH3 is a weak base (Kb = 1.8 × 10–5) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.050 M in NH4Cl?

asked by Jefferson on March 9, 2013
62. ## Chemistry--Pretty simple question

You dissolved a solute in some water to make a solution. If you had needed to know how much solute dissolved, how could you have determined this? I was just guessing of using a scale, but there must be some other way.

asked by -Untamed- on September 29, 2011
63. ## Chemistry

1.What is the molarity of a solution of silver perchlorate, AgClO 4, if 3.2 moles of silver perchlorate are dissolved in 1.5 liters of water?

asked by Barbara on April 6, 2011
64. ## another college chem

Calculate the boiling point of a 4.35 m benzene solution in phenol. (phenol bp=181.75 degree C and Kb=304 degree C/m)

asked by laney on April 27, 2010
65. ## Chemistry

How many milliliters of a 1.95 M LiCl solution contain 18.2g of LiCl?

asked by Rebecca on November 7, 2011
66. ## Science

A hypertonic solution is likely to contain many/no electrolytes. Is is many or no electrolytes?

asked by Bree on January 3, 2011
67. ## science

how much of a 0.225 M KCl solution contains 55.8g of KCl

asked by moises on March 9, 2011
68. ## Chem

How many grams of a 28.0% (m/m) CuSO4 solution contain 39.0 g CuSO4?

asked by Nikki on October 22, 2017
69. ## Chemistry

What is the pH of a 0.350M HBrO Solution? HBrO, Ka=2.3 x 10^-9

asked by May on November 26, 2012
70. ## chemistry

how much of a 0.225 M KCl solution contains 55.8g of KCl

asked by moises on March 9, 2011
71. ## Math

What is the solution to the equation 1%=(x/100)x 100? Thanks

asked by Lorraine on March 11, 2011
72. ## chemistry

how do I prepare 10% HCL from 50% HCL solution

asked by slindile on July 1, 2016
73. ## MATH

F(X)=-6-1 AND G(X)=4X^2 WHAT WOULD THE SOLUTION FOR (FG) (X) BE. im stuck between -24x^2-1 or -24x^3-4x^2

asked by WINSTON on March 9, 2014
74. ## Chemistry

How do I calculate the solution of Ag(NO3)in Ca(NO3)2?

asked by Zoshk on October 15, 2010
75. ## science

how much of a 0.225 M KCl solution contains 55.8g of KCl

asked by moises on March 9, 2011
76. ## Chemistry pH

What is the pH of a solution that contains 0.30 M HC2H3O2 and 0.95 M C2H3O2-? Use Ka = 1.8 × 10-5 for HC2H3O2.

asked by Dina on April 22, 2014
77. ## Chemistry

How many moles of H3PO4 are there in 35.0 mL of 0.60 M H3PO4 solution?

asked by Anonymous on October 3, 2011
78. ## Chemistry

the pH of a .3 M solution of a weak base is 10.72. what is the Kb of the base?

asked by Anonymous on February 28, 2011
79. ## chemistry

6). Which solution has the lowest pH? A) 1.3 X10–8 M –OH B) 1.0 X 10–7 M –OH C) 5.1 X10–5 M –OH D) 3.9 X 10–8 M –OH E) 2.3 X 10–3 M –OH

asked by denis on November 28, 2011
80. ## Algebra II

What is the solution of the equation? 1+sqrt(3x+3) = sqrt(7x+2)

asked by Nickie on January 25, 2018
81. ## Math

How much 40% Nacl (Fw 58.44) would you need to make 2.5L of a 5% Nacl solution?

asked by Rana on April 24, 2013
82. ## chemistry

what is the mole of a solution that has 6 mole of Ca-Cl 2 in 3 kg of water?

asked by Anonymous on June 16, 2016
83. ## Chemistry

What volume of a 0.33 M Mg(NO3)2 solution contains 96 g of Mg(NO3)2?

asked by Kelsey G on November 30, 2010
84. ## chemistry

34.0g of NaOH in 500.mL of NaOH solution

asked by faiza on March 17, 2014
85. ## Chemistry

At a certain temperature, the pH of a neutral solution is 7.77. What is the value of Kw at that temperature?

asked by Pete on November 22, 2010
86. ## science

A solution of HNO3 has a pH of 4.5, What is the molarity of HNo3?

asked by Ray on April 26, 2011
87. ## chemistry

a 8.6 *10 to the -3 power M solution of H3PO4 has a PH of 2.30 what is the Ka for H3PO4?

asked by ryan on May 13, 2012
88. ## chemistry

If the first pKa of H2S is 7.0, what is the pH of a solution containing 10% H2S- and 90% HS-?

asked by noell on November 4, 2010
89. ## Chemistry

If the Kb of a weak base is 2.6 × 10-6, what is the pH of a 0.24 M solution of this base?

asked by Alex on October 6, 2012
90. ## History

1.)Which is the main way the Bill of Rights protected against the tyranny that the Anti-Federalists feared? A.)It established and protected the same rights for all citizens, including women and slaves. B.)It gave all of the states the same amount of power

asked by YRN DJ on November 30, 2015
91. ## physics

Two flat slides of glass are separated at one edge by a thin wire, as shown below. The top surface of the upper slide and the bottom surface of the lower slide have special coatings on them so that they reflect no light. The system is illuminated with

asked by Jason on March 29, 2010
92. ## mechanics

A 60 Kg skier leaves the end of a ski-jump ramp with a velocity of 24m/s directed 25° above the horizontal. Suppose that as a result of air drag the skier returns to the ground with a speed of 22 m/s, landing 14m vertically below the end of the ramp. From

asked by Anonymous on March 27, 2011
93. ## Math

the average length of time for students to register for fall classes at a certain college has been 50 minutes. a new registration procedure using modern computing machine is being tried. if a random sample of 12 students had an average registration time of

asked by Anonymous on February 19, 2018

Think of a way Centura College Online could utilize one of the systems for decision making or control mentioned in this chapter to improve the way it educates students. Write a proposal (minimum of one page) to the School Director “selling” your idea.

asked by Anonymous on April 25, 2010
95. ## math

You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of an object varies on different planets, but did you know that the weight of an object on Earth also varies according to the elevation of the object? In particular,

asked by Tony on September 24, 2010
96. ## algebra

you will be making hanging flower baskets. the plants you have picked out are blooming annuals and non-blooming annuals. the blooming annuals cost \$3.20 each and the non-blooming annuals cost \$1.50 each. you bought a total of 24 plants for \$49.60. write a

asked by Bri on January 31, 2011
97. ## Hydraulic Physics

In a hydraulic system a 20.0-N force is applied to the small piston with cross sectional area 25.0 cm2. What weight can be lifted by the large piston with cross sectional area 50.0 cm2? Would I need to divide both pistons areas then mutiply the force? and

asked by Justin on October 29, 2014
98. ## Intro to Computers

You are setting up a desktop computer for an AutoCad specialist who needs a minimum of 125 GB of RAM. Which operating system below would be best-suited for his needs? A. Windows 8 Home 64-Bit Edition B. Windows XP 32-Bit Professional Edition C. Windows

asked by Nicole on January 13, 2014