# 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 456
1. ## chemistry

6) How many grams of copper (II) fluoride, CuF2, are needed to make 6.7 liters of a 1.2 M solution?

asked by jeff on May 11, 2010
2. ## Chemistry

pH of 10^-3M HAc and 10^-2M NH4Cl in aqueous solution?? Do you just figure out each [H+] concentration separately and then add them??

asked by Jason on March 22, 2012
3. ## CHEMISTRY

Does it produce precipitate if 1.7 g of AgNO3 and 14.5 g of NaCl solvated in 200 mL water to get a solution in 25 oC ? thank you

4. ## Chemistry

7. A solution is prepared by dissolving 8.5 g NaHCO3 and 12.7 g Na2CO3 in 500.0 mL of water. Calculate the pH.

asked by Nick on March 20, 2013
5. ## chemistry

You have prepared a saturated solution of at 20 using 31.0 of water. How much more solute can be dissolved if the temperature is increased to 30?

asked by Anonymous on March 31, 2011
6. ## differential equations

dy/dx=4x/y..verify that the straight lines y=2x are solution curves, provided x doesnt equal 0.

asked by siddh on January 9, 2013
7. ## Math

Find the solution and round to the hundredths. 24 divided by 0.865. I got two answers I'm confused.

asked by Jessica on March 16, 2013
8. ## 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
9. ## chemistry

The concentration of Mg2+ ion in a solution is 0.010M. At what pH will Mg(OH)2 first precipitate? (Given Ksp Mg(OH)2 equals 1.2*10-11)

asked by Lisa on June 16, 2015
10. ## Chemistry

State what happens on bubbling chlorine into a solution of iron (ii) chloride explain with equation

asked by Anonymous on August 11, 2018
11. ## 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
12. ## chemistry

how many grams of NaOH pallets containing 12% moisture are requiredto prepared 60 ltr of 0.5N solution

asked by shweta on May 19, 2015
13. ## Science

how many ml of water are present in 250ml of a 15% by volume oguous hydrocloric acid solution?

asked by Araceli on July 7, 2014
14. ## 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
15. ## Chemistry

How much H3PO4 is needed to neutralize 1 liter of a 0.75M solution of NaOH? (in moles)

asked by Damon on July 26, 2016
16. ## 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
17. ## Chemistry

7. A solution is prepared by dissolving 8.5 g NaHCO3 and 12.7 g Na2CO3 in 500.0 mL of water. Calculate the pH.

asked by Nick on March 20, 2013
18. ## chemistry

How do you sole this problem: how many grams of CaCl2 are needed to prepare 7.25 L of .015M solution?

asked by Brittany jones on March 15, 2013
19. ## 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
20. ## science

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

asked by tracey on January 2, 2012
21. ## 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
22. ## 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
23. ## math

#please people help me the solution of this question# Change 7380 seconds into hours and minutes.

asked by kelvin on August 7, 2018
24. ## 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
25. ## cerritos

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

asked by maribel on September 18, 2011
26. ## ration equation mind jumbler

What is an example of a rational equation where the solution makes the denominator equal to zero and are extraneous solutions?

asked by Suzy Q on September 25, 2007
27. ## 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
28. ## math

#please people help me the solution of this question# Change 7380 seconds into hours and minutes.

asked by kelvin on August 7, 2018
29. ## 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
30. ## Chemistry

what is the mass percent of a solution made by dissolving 35.5 g. of NaCl in 500 g. of water?

asked by Dillan on September 27, 2015
31. ## chemistry

What is the mass of hydrogen peroxide, H2O2, in a 250 g sample of a 2.75% by weight solution?

asked by Anonymous on October 10, 2011
32. ## CHEMISTRY

What mass of NaCl is required to precipitate all the Ag ions from 20 mL of .100 M AgNO3 solution

asked by CIndy on April 22, 2013
33. ## Chemistry

What will be the concentration of the solution formed when 5.72mL of 8.50M HCl is diluted to 250mL?

asked by Chelsea on December 10, 2013
34. ## 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
35. ## chemistry

what is the total molarity of all the ions present in 0.1M cuso4 and 0.1M al2(so4)3 solution?

asked by banda on September 30, 2015
36. ## Chemistry

How many milliliters of pure acetic acid (density = 1.05 g/mL) would be required to prepare 1.00 L of the solution?

asked by Devin on November 16, 2010
37. ## chemistry

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

38. ## chemistry

how much silver nitrate required to make 0.01 mol per litres 500 ml solution

asked by Anonymous on July 16, 2019
39. ## chemistry

How would you prepare 100.0 mL of 0.07500 M AgNO3 solution starting with pure solute?

asked by jennifer on January 11, 2010
40. ## chemistry

How many milliliters of 0.155 M HCl are needed to neutralize completely 35.0 mL of 0.101 M Ba(OH)2 solution?

asked by jennifer on January 11, 2010
41. ## Chemistry

What is the pH of a 0.125 M solution of a weak base if ∆H° = -28.0 kJ and ∆S° = -175 J/K for the following equilibrium reaction at 25°C: B (aq) + H2O (l) ↔ BH+ (aq) + OH- (aq)

asked by Mika on December 15, 2011
42. ## Analytic geometry

asked by Xavier on January 12, 2013
43. ## chemistry

Determine the mass of Co(NO3)2•6 H2O to prepare 250 mL of a 0.50 M stock solution.

asked by Cortney on March 28, 2012
44. ## math

how do you write an open statement involving an absolute value inequality when all you are given is the graph of the solution?

asked by ed on September 20, 2007
45. ## algebra

a boy ran a distance of 5.8 kilometres.how many metres did he run?what is the solution for this question?

asked by honey on September 8, 2014
46. ## math

If X is a point on the segment joining A(2,-1) and B(9,6), find the coordinates of X if AX:XB = 2:5. with solution pls... tnx...

asked by HELP HELP HELP MNHS on January 30, 2013
47. ## chemistry

PLS HELP ME AND THANK YOU:) What is the molarity if 2.18 grams of CO(NO3)2.6H2O dissolved in 50.00ml of solution?

asked by may on April 6, 2014
48. ## chem

calculate the molality of a solution of 2.34g acetic acid, HC2H3O2, in 35.0 g water

asked by michael on October 11, 2011
49. ## 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
50. ## Chemistry

Name the product formed when carbon two oxide is passed into potassium hydroxide solution.

asked by Yaseerah on May 20, 2015
51. ## Chemistry

What is the pH of a solution that results from the addition of 5mL of 0.1 M HCl to 50mL of pure water?

asked by Anonymous on April 6, 2011
52. ## 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
53. ## CHEMISTRY

If a nickel rod embedded in a silver nitrate solution , what do we predict ? explain

54. ## Chemistry

You are asked to prepare 0.15 M HCl from a 36% W/v stock solution.Describe the procedure of the preparation.

asked by Jimmy K on August 30, 2008
55. ## chemistry

How many moles of Na2CO3 would be needed to react with 750 mL of 0.250 M H2SO4 solution?

asked by Emily on April 1, 2011
56. ## chemistry

How many mL of 5.00% (w/v) solution are needed to make 100mL of physiologic saline (0.90%(w/v) sodium chloride)?

asked by bob on March 17, 2011
57. ## chemistry

Determine the pH of a 0.045mol dm–3 solution of sodium ethanoate (ethanoic acid: pKa=4.75).

asked by Kay-Anna on September 30, 2015
58. ## Chemistry

What is the [CrO4] in a 2.5 L saturated solution of lead (II) chromate to which 0.05 mol Pb(NO3)2 is added?

asked by Josh on April 29, 2012
59. ## 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
60. ## Math

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

asked by Jazz on January 18, 2012
61. ## science

Briefly describe how you would prepare 500cm of 1mole of NaCl solution in the laboratory.(Na-23,Cl-35.5)

asked by Precious Appiah on March 18, 2016
62. ## Chemistry

Calculate the molality of CsCl in a 6% by mass aqueous solution. Answer in units of m.

asked by Cheyenne on September 23, 2010
63. ## discrete math

Find the solution to the following lhcc recurrence: an=3nan-1 for n >or equal to with initial conditions a0=4

asked by cjones on April 16, 2012
64. ## chemistry

Calculate the percent by mass of the solute in each of the following aqueous solutions. (a) 5.10 g of NaBr in 78.2 g of solution

asked by katiy on April 26, 2012
65. ## General Chemistry

What is the molarity of a solution produced by dissolving 61 g of KNO3 in a 100 mL volumetric flask?

asked by kaley on June 6, 2010
66. ## 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
67. ## chemistry

Consider two beakers, one with water and other one with sodium chloride solution. Which of these will have higher vapor pressure

asked by Angel on June 20, 2010
68. ## chemistry

Will a precipitate form when an aqueous solution of (NH4)4CO3 is mixed with Fe(NO3)3

asked by Anonymous on October 4, 2011
69. ## chemistry

Will a precipitate form when an aqueous solution of (NH4)4CO3 is mixed with Fe(NO3)3

asked by Anonymous on October 4, 2011
70. ## chemistry

The molecular weight of H2SO4 is 98. The amount of the acid present in 400ml of 0.1M solution

asked by Anonymous on January 4, 2011
71. ## chemistry

If 25.0mL of 0.56 M H2SO4 is diluted to a volume of 125 mL, what is the molarity of the resulting solution?

asked by katie on October 28, 2012
72. ## science

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

asked by Anonymous on December 12, 2016
73. ## science

The potential of hydrogen electrode is -118MV.thr H^+ concentration of the solution is a)0.01M b)2M C)10^4M d)1M

74. ## Chemistry

Molarity of NaNo by diluting 250.0 of a 1.60 solution to a final volume of 400cm3

asked by Anonymous on October 15, 2018
75. ## Chemistry

What is the net ionic equation for the precipitation of nickel sulfide from aqueous solution.

asked by Anonymous on October 4, 2010
76. ## Chemistry

Calculate the pH of concentrated hydrochloric acid if this solution is 24.8 % HCl by weight and has a density of 1.16 g/mL.

asked by A.A on November 1, 2008
77. ## geometry

what is the area of a circle with a circumference of 22 pi in.? expressed in pi in. squared? and what are the steps to arrive at the solution?

asked by Rachel on April 5, 2011
78. ## 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
79. ## Chemistry

How do i balance the oxidation-recution reaction Al(s)+MnO4(aq)-->MnO2(s)+Al(OH)4(aq) if it is in a basic solution?

asked by Anonymous on September 6, 2007
80. ## Chemistry

Calculate the molality of a solution prepared by dissolving 31.6 g of Fe2O3 in 750. g of water

asked by Tina on April 8, 2012
81. ## science

23g of salt is dissolved in 100g of water at 23 k. what is the concentrarion of solution at this temperarure.

82. ## chemistry

can i mix hypochlorite powder and baking soda to make a bleach solution?

asked by jimdel on January 17, 2013
83. ## Chem

what is the hydronium-ion concentration at equilibrium in a 0.71 M solution of aniline (Kb=4.2x10^-10) at 25 Celsius

asked by Che on March 19, 2013
84. ## 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
85. ## 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 Palak on November 11, 2016
86. ## chemistry

What is the g/L concentration of a solution terminating 10g of NaCI with 95% purity in 250 ml of water?

asked by william on July 12, 2018
87. ## science

If 2.7 moles of copper metal was deposited from a solution of Cu(NO3)2, how many electrons were involved?

asked by Andrea on April 18, 2013
88. ## chemistry

Will a precipitate form when an aqueous solution of (NH4)4CO3 is mixed with Fe(NO3)3

asked by Anonymous on October 4, 2011
89. ## chemistry

A 150mL sample of 0.45 M HNO3 is diluted to 450 mL. What is the molarity of the resulting solution?

asked by katie on October 28, 2012
90. ## chemistry

calculate the mass of sodium hydroxide needed to prepare 100 ml of a .10 m solution

asked by mike on October 7, 2012
91. ## Chemistry

Calculate the mass concentration of H2SO4 in a solution of 36%, with density 1.84g/cm3

asked by Anonymous on January 20, 2013
92. ## Math

Hello, I am struggling to get the right solution for 2 x [1 1/2+ (3.3-1.1)] I have even asked my mom and dad but they didn’t get it right either. Please help and answer as quick as possible. Thank you.

asked by Lahee on June 29, 2019
93. ## CHEMISTRY URGENT!!!

Determine the pH (to two decimal places) of the solution that is produced by mixing 30.3 mL of 1.00×10-4 M HBr with 829 mL of 5.77×10-4 M Ca(OH)2.

asked by Colin on March 23, 2011
94. ## SCIENCE

HELP ME!! EVERYONE IS MAD AT ME BCUZ THEY THINK I AM YELLING AT THEM BUT REALLY MY COMPUTER WILL ONLY DO BIG LETTERS! IF THERE IS A SOLUTION TO THIS PLEASE HELP ME. THIS IS NOT A JOKE.

asked by SAMMI on October 4, 2010
95. ## chemistry

calculate the mass of sodium hydroxide needed to prepare 100 ml of a .10 m solution

asked by mike on October 7, 2012
96. ## 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
97. ## college

Calculate the pH of concentrated hydrochloric acid if this solution is 24.8 % HCl by weight and has a density of 1.16 g/mL. a. ) -0.77 b. ) -0.83 c. ) -0.90 d. ) -0.98 e. ) -1.01 i got c

asked by A.A on November 1, 2008
98. ## science

Calculate the amount of h2so4 required for preparing 500ml of 2MH2so4 solution.

asked by v¨ªşhął on February 29, 2016
99. ## Math

Twenty equals four decreased by twice an unknown number. I need the equation and the solution please I'm almost finished!!!!!!!!!!!!!!!!!!!!

asked by Briana on April 21, 2009
100. ## 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