# 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 681
1. ## Calculus

A cone is inscribed in a sphere of radius a, centred at the origin. The height of the cone is x and the radius of the base of the cone is r, as shown in the diagram opposite. Find the height, x, for which the volume of the cone is a maximum. (HINT: show

asked by Grant on May 6, 2013
2. ## algebra

Suppose you are an event coordinator for a large performance theater. One of the hottest new Broadway musicals has started to tour, and your city is the first stop on the tour. You need to supply information about projected ticket sales to the box office

asked by bev on July 19, 2009
3. ## Algebra

Suppose you are an event coordinator for a large performance theater. One of the hottest new Broadway musicals has started to tour, and your city is the first stop on the tour. You need to supply information about projected ticket sales to the box office

asked by Jerry on September 19, 2009
4. ## maths

supose that you have three diffrent lenghts of linking cubes as shown below assume that you have as many of these lenghts as you need but you may not take them apart can you make each lenghts below using only one colour if it is possible show more than one

asked by asad ullah on September 14, 2017
5. ## Chemistry

How many liters of gasesous methane (CH4) must be burned in oxygen to produce enough H2O and CO2 to fill a 3.0 L balloon? Assume that H2O and CO2 are the only combustion products and that the temperature and pressure remain constant. How would I solve

asked by Amy~ on August 29, 2010
6. ## math

10.On 16 april 1990, RM5000 was invested at 6% compounded semi annually. Find the amount accumulated on 16 october 1993 if the rate was charged to 8% compounded quarterly beginning 16 april 1992. the answer is : RM 6339.24 i want to know the step to solve

asked by fizz on April 24, 2014
7. ## Chemistry

The relative molecular mass of calcium carbonate is 100. What is the minimum volume of 2.0 M hydrochloric acid that would be needed to completely react with 2.0 g of calcium carbonate? options are A) 20 cm^3 B) 10 cm^3 C) 5 cm^3 D) 30 cm^3 E) 40 cm^3 I

asked by chem_cg on July 11, 2017
8. ## statistics

what fraction of games won? percentages 0.676 0.606 0.624 0.667 0.672 1/2 of the games With the limited data given, I don't know how Daniel came to his conclusion. More data is needed. Please respond with the complete information for the problem, and we

asked by patti help on March 7, 2007
9. ## Physics

How do you solve this problem? A ball on the end of a string is revolved at a uniform rate in a vertical circle radius of 72.0 cm, as shown in figure. If its speed is 4.00m/s and its mass is .300 kg. Calculate the tension in the string when the ball is a)

asked by Emily Grossman on February 21, 2011
10. ## Math

Toni rows a boat 4.5 km/h upstream and then turns around and rows 5.5 km/h back downstream to her starting point. If her total rowing time is 48 min, for how long does she row upstream? you can express your answer to the nearest minute. I don't understand

asked by Angie on January 17, 2009
11. ## Algebra

Solve graphically. x-y=0 y=x² The reason I don't understand the question is the second equation with the x². How do I graph that? I'm not sure if I ever graphed with an exponent, and if I did, it was a long time ago. I'm reposting this because I didn't

asked by Tessa on February 19, 2009
12. ## chemistry

Based on the balanced equation 2I2O5 + 10NO → 5N2O4 + 2I2 calculate the number of excess reagent units remaining when 188 I2O5 molecules and 850 NO molecules react? do i start with a new balance equation in order to solve it

asked by eng on February 10, 2010
13. ## algebra

I'm a little confused on how to solve this: The number of cricket chirps per minute is given by N(t) = 7.2t - 32 Where t is the temperature in degrees Celsius. a. Graph the equation N(t) = 7.2t - 32 I have learned a few ways to graph equations. One way

asked by Celina on December 16, 2008
14. ## pre cal

(1/3)LN27 + 2LNx = LN(2-x) i think i just need help getting started. I assume that your LN notation is log to base e. I will call it ln. (1/3)ln 27 = ln (27)^(1/3) = ln 3, (since 27^(1/3) is the cube root of 27). Therefore ln 3 + 2 ln x = ln (3 x^2) = ln

asked by Marie on February 25, 2007
15. ## science

the quetion says "f the half life of Americium-241 is 433 years, &your sample size is 80 grams, how much will remain after 1,732 years?" i don't quite understand how to solve this problem... PLEAS HELP. SOS (gotta test 2morrow, and don't really know how to

asked by brianna on January 15, 2009
16. ## Precal

Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to two decimal places where appropriate.) cos θ = 0.16 I know how to find the answers when it's in fraction form, however, I do not know how to do

asked by Zoe on November 4, 2015
17. ## math

Navigation. The current in a typical Mississippi River shipping route flows at a rate of 4 mph. In order for a barge to travel 24 mi upriver and then return in a total of 5 hr, approximately how fast must the barge be able to travel in still water?Solve by

asked by carol on May 3, 2011
18. ## Physics/Math

What are the x and y components of a vector a in the xy plane if it's direction is 215 degrees counterclockwise from the positive direction of the x axis and its magnitude is 12.9 m ? you would be in the third quadrant, so both x and y are negative. The

asked by COFFEE on February 18, 2007
19. ## Trig

If it helps the answer according to this ACT compass sample test questions print out is 6.93. How to solve it is the question ... C is a 90 degree angle. AB is 8 and the hypotenuse. AC is the base .... we don't know it's length. It's on page 14 if you

asked by Joe on May 13, 2014
20. ## Elementary Statistics

"Scores on the Wechsler IQ test approximate a normal curve with a mean of 100 and a standard deviation of 15. b. What percentage of IQ scores are below 74?" I've been working at this for a while now, but when I solve for the z-score, I keep getting a

asked by Nicole on March 10, 2015
21. ## Math- Need Help..

I'm having trouble with a question from one of my math assignments and it's driving me crazy. Its: -2/5x - 9 < 9/10 (two-fifths and nine-tenths) I tried doing it a few times, it might be easier than it looks and I just don't understand. If someone can

asked by --- on November 3, 2017
22. ## Chemistry

Given that 10.0 atm each of NO and O2 are introduced into a reaction vessel at room temperature. Calculate the partial pressure of each gas at equilibrium. 2NO(g)+O2 (g)---> 2NO2 (g) Kp =4.2x1012. at. roomtemperature. To solve this question I need to find

asked by Larin on March 6, 2017
23. ## english

Use one of the following topic sentences to write a well-developed paragraph of approximately 150 words. Supply the specific details or examples that support the topic sentence you choose. •Our dog is a nuisance to the neighbors. •Baby-sitting is an

asked by mindy on December 6, 2011
24. ## reading and writing

Please read the following excerpt from an essay, and answer the question that follows. After Sean was arrested for breaking into a pawnshop, I began to wonder. Why did some kids from my neighborhood end up in trouble while most of us didn't? I started out

asked by Clare on April 1, 2015
25. ## LA

What do you learn from the dialogue between Mr. Frank and Miep at the beginning of Scene 1? A;Miep wants to show Mr. Frank something in the building. B;Mr. Frank wants to live in this building to hold on to his memories. C;The war has ended, but Mr. Frank

asked by jeff on April 8, 2013
26. ## managerial accounting

Scott Manufacturing Co.’s static budget at 10,000 units of production includes \$40,000 for direct labor and \$4,000 for electric power. Total fixed costs are \$23,000. At 12,000 units of production, a flexible budget would show:

asked by Anonymous on May 3, 2014
27. ## Lang. Arts Help

What do you learn from the dialogue between Mr. Frank and Miep at the beginning of Scene 1? A.Miep wants to show Mr. Frank something in the building. B.Mr. Frank wants to live in this building to hold on to his memories. C.The war has ended, but Mr. Frank

asked by Cassie on February 11, 2013
28. ## Math 10C

Janet needs a rectangular piece of cardboard measuring 21 ft by 24 ft for a school project. a) What is the area of the cardboard in square feet? b) What is the area of the cardboard in square yards? Show your calculations in two different ways. c) The

asked by Kevin on February 7, 2017
29. ## Texas History

What geloed expand the system of roads and highways in Texas in the 1920’s A. A gas tax B. A new form of asphalt C. Country government control D. Federal matching funds 2. Which major factor contributed to the population boom of the 1920’s A. The price

asked by Rj on January 31, 2018
30. ## Chemistry

please verify my answer: Consider the following REDOX reaction: Zn(s) + Pb+2(aq) �� Zn+2(aq) + Pb(s) a. Write the oxidation and reduction half-cell reactions. Zn(s) + Pb+2(aq) �� Zn+2(aq) + Pb(s) +2 +4 +2 +4 Zn(s)->Zn2+(aq)+2e-

asked by Dexter on June 16, 2011
31. ## math

need help please. the time required for one complete oscillation of a pendulum is called its period. if L is the length of the pendulum, then the period is given by P= 2 times pie multiplied by the square root of (L/g), where g is a constant called the

asked by john on December 2, 2014
32. ## PHYSICS

Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #8: A 20 kg block of ice slides without friction down a

asked by Anna on March 7, 2013
33. ## Physics

I've been stuck on this problem and hope someone can help me. A man is standing on scales which show his weight as 607.6 N. A .50 kg ball is dropped from a height of 1 m into his hands. His hands drop 25 cm from chest level to waist level during the

asked by Brigid on March 22, 2009
34. ## Math

Consider a 92∘C cup of coffee placed in a 24∘C room. Suppose it is known that the coffee cools at a rate of 2∘C/min when it is 70∘C. Then according to Newton's law of cooling, the temperature T(t) of the coffee t minutes after being placed in the

asked by R on November 14, 2018
35. ## English (MLA format)

in works cited I need to cite a book that is made by several authors. Which author do I chose? Also I know I'm suppose to do Last name, First Name, et. al. were there are many authors which author do I chose? Also if I wanted to cite this author how do I

asked by English (MLA format) on November 9, 2009
36. ## 8th Grade Algebra: Answer Check

Find the length of the 3rd side of each right triangle. 1. 8^2+15^2=c^2 Answer: c=17 2. 5^2+b^2=13^2 Answer: b=12 3. 9^2+13^2=c^2 Answer: c~15.81 Simplify. Assume that all variables are nonnegative. { this means square root 4. {12 Answer: 2{3 5. 2{75

asked by Joy on January 20, 2009
37. ## english

Can someone check my answer and let me know if it is missing something? Make any necessary corrections to the following paragraph- look for sound alike words, verb tense shift, singular subject/pronoun agreement etc… Tom Greene, Director of Sales, was in

asked by tamara on April 1, 2011
38. ## Introduction To Teacher Aide

Ok i need help please! I don't have the book to help me so can someone please help me! I did my best to answer some..if i got them wrong please correct them for me... Thanks :) 1. Which of the following might be a duty of a noninstructional aide? A.

asked by KAYLA on January 9, 2009
39. ## Business Operations

I am wondering if someone could let me know whether my calculations for the critical ratio is correct. I've included the problem and my portion of the work I'd like some help on. Hi-Ho Yo-Yo, Inc. It was a little past 9:00 on a Monday morning when Jeff

asked by HJ on October 29, 2012
40. ## government

Which of the following separates the American political party system from that of western European nations? A. American political parties have national reach. B. Most European nations only have one political party. C. Most European political parties have

asked by dbh on June 4, 2019
41. ## Chemistry

Calcium hydroxide has Ksp = 5.5 x 10-5 at 25 oC and a molar mass of 74.10 g/mol. How many grams of calcium hydroxide are needed to create 365 mL of a saturated solution of calcium hydroxide at 25 oC?

asked by Molly on April 27, 2015
42. ## Chemistry

Why can't we apply Kd directly to a equilibrium solution of CCl4 and H2O,with CH3COOH dissolved? Do CH3COOH form polymers in CCl4? or are their single molecules of CH3COOH in CCl4?

asked by Shenaya on July 26, 2017
43. ## Chem

What is the equilibrium concentration of chloroacetic acid in a solution prepared by dissolving 0.0314 mil of chloroacetic acid in 1.10L of water? For chloroacetic acid, Ka= 1.4X10^-3

asked by Chemistry on March 19, 2013
44. ## chemistry

calculate what volume of sulfuric acid solution(specific gravity=1.07;and containing 10%sulfuric acid by mass)contains 18.50g of pure sulfuric acid at a temperature of 25 Celsius.

asked by jen on November 12, 2016
45. ## chemestry

A student weighs out a 14.0 g sample of Fe(NO3)2, transfers it to a 500 mL volumetric flask, adds enough water to dissolve it and then adds water to the 500 mL tic mark. What is the molarity of iron(II) nitrate in the resulting solution?

asked by cristy on November 17, 2010
46. ## Chemistry

If 0.0142 M aqueous Cl- is produced stoichiometrically according to the balanced equation in a reaction solution with a total volume of 1480 mL, how many mol of solid Ca3(PO4)2 are produced? 3 CaCl2(aq) + 2 Na3PO4(aq) → Ca3(PO4)2(s) + 6 NaCl(aq)

asked by Jody on February 17, 2012
47. ## Chemistry

I have asked this question before but I was not clear enough. I want to prepare a 37% w/w solution (in water)of sulfuric acid from 96% sulfuric acid. I need around 500ml, I know it won't be exactly that, I want to know how to use the conversion using

asked by Pam on December 22, 2016
48. ## chemistry

When aqueous solutions of potassium hypochlorite and nitric acid are mixed, an aqueous solution of potassium nitrate and hypochlorous acid results. Write the net ionic equation for the reaction. Use H+ for the hydronium ion.

asked by smith on March 3, 2014
49. ## chem

The molarity and the molality of a solution prepared by dissolving 2.00 g of ethanol C2H5OH with 100.0 g of water to give a final volume 102 mL are would i just add both the grams and divide by 102 for molarity? and molalty i would just add the mass?

asked by so on August 8, 2008
50. ## Chemistry

1 ml of 8.675x10^-3 M sodium salicylate was dispensed in a 100 ml volumetric flask, It was diluted to 100ml mark with acidified 0.02 M Iron (III) Chloride solution. What is the number of moles of Iron (III) Salicylate complex?

asked by Emma on November 19, 2012
51. ## Chemistry

a few drops of NaOH are added to a sample of the unknown. A blue precipitate appears. Next, approximately 1mL of ammonia, NH3, is added. The precipitate dissolves, but the solution remains blue. Which ion is present. Explain

asked by Reen on January 24, 2010
52. ## CHEM- solution/freezing piont

a solution of sulfur (2.560g) in naphthalene (100g) freezes 0.68K lower the freezing point of pure naphthalene (353.10K). for naphthalene, Kf= 6.8K kg mol. calculatem the molecular formula of the sulfur dissolved in the naphthalene?

asked by lulu on October 14, 2010
53. ## chemistry

Calculate the pH range required to separate 99.99% of Cr3+ from Zn2+ by precipitation of Cr(OH)3(s) in a solution that is initially 0.034 M in both Cr3+ and Zn2+. Use the Ksp values from Table 16.2 of Chang and calculate the pH to the nearest 0.01 pH unit.

asked by Tanner on March 25, 2012
54. ## chemistry

Glycerin, C3H8O3, is a nonvolatile liquid. What is the vapor pressure of a solution made by adding 164 g of glycerin to 325 mL of H2O at 39.8°C? The vapor pressure of pure water at 39.8°C is 54.74 torr and its density is 0.992 g/cm3.

asked by tay on February 12, 2011
55. ## Bio Lab

You need to prepare medium for your culture cells. Your salt solution is 10x concentration, dilute to 1x for use. You also need to add fetal bovine serum for a final concentration of 10%. What would you add of each for the correct final concentrations in a

asked by Andy on November 3, 2010
56. ## chemistry

Glycerin (C3H8O3) is a nonvolatile liquid. What is the vapor pressure of a solution made by adding 180. g of glycerin to 321 mL of H2O at 39.8°C? The vapor pressure of pure water at 39.8°C is 54.74 torr and its density is 0.992 g/cm3.

asked by bob on May 4, 2010
57. ## chemistry

In the experiment you have added 50.0 mL of Ni(H2O)6 2+ to the calorimeter. To this you add 5.0 mL of ethlylenediamine and measure the change in temperature of the solution as the reaction proceeds. The temperature increases by 3.4 oC. Calculate the

asked by Barb on April 9, 2013
58. ## chemistry

Calculate the [OCl-] of a 7.03×10-2 M solution of the weak acid HClO (make an approximate calculation assuming that initial concentration is equal to the equilibrium concentration). Round your answer to 3 significant digits. HClO = OCl- + H+

asked by HELP ASAP PLEASE on October 10, 2013
59. ## Chemistry

I was given a solution of HCOOH with hand approximate concentration of 0.20 moles and I need to titrate this with a 0.110 V mol of NaOH. If I add 20 milliliters of hcooh to the beaker before I titrate approximately what volume of NaOH will be required to

asked by Kabw on September 30, 2016
60. ## chemistry lab

Hi, so I did a lab on acids, bases, salts and buffer solutions. After measuring the pH for a .010 M HCl solution I got a pH of 2.50. After doing a calculated pH of .010 M of HCl the answers is 2. My question is why do you think my pH from the experimental

asked by maura on March 27, 2012
61. ## Chemistry

If exactly 14.563g of KMnO4 were dissolved to yield 750mL of solution, what is the normality? I know the equivalent weight is 31.61g. This is how much I got. (14.563g/.750L)(1 mol KMnO4/158.03g)(5 e-/1 mol) = .615 This answer does not seem right however.

asked by CodyJinks on April 13, 2019
62. ## Chemistry

Calculate the molarity of the HCl solution if 25.00ml of the acid are required to neutralize 1.00g of each of the following 1) KOH 2)Ca(OH)2 I calculated the molar mass of KOH which was 56.11 Then I took 1.00g/56.11 = 0.0178mol To find out the molarity I

asked by Sarah on October 28, 2014
63. ## math

A recreation room has the following dimensions.12ft,30ft,8ft,8ft. Carpeting will cost \$1.50 a square foot. How many square feet of carpet will be needed and how much will it cost? Include correct units at each stage within your solution.

asked by kozy on May 11, 2011
64. ## percipitate and colour

a few drops of NaOH are added to a sample of the unknown. A blue precipitate appears. Next, approximately 1mL of ammonia, NH3, is added. The precipitate dissolves, but the solution remains blue. Which ion is present. Explain

asked by Reen on January 24, 2010
65. ## chemistry

More dilute sodium hydroxide solutions are often prepared from a sastuated sodium hydroxide soltuion that's is 52.0% by mass and has a density of 1.48 g/mL. Calculate the volume, in liters, of this solution needed to prepare 35.0 L if 0.125 M sodium

asked by conlan on March 30, 2011
66. ## chemistry

The specific heat of the dilute NaCl solution formed during the neutralization of the HCl is about 2% less than the 4.184 J/k g assumed in the calculation for the molar heat of neutralization of the acid. How will this affect your final result for the heat

asked by kate on February 23, 2011
67. ## Computers C

Backgound The employees can be any one of the two types: 1) Full-Time Salaried (FTS) and 2) Part-Time Hourly (PTH). Currently, there are totally 1050 FTS employees and 274 PTH employees in a company. The company plans to add up to 50 new employees FTS

asked by Bob on November 18, 2010
68. ## social studies

i got a presentation about social development and education? plzz tell me what to do I would suggest you start doing some research on social development and learning. Here is one you can start with:

asked by abdul muqeet on November 17, 2006
69. ## math (Ms.Sue)

Bella planted 7 marigolds in each of the 8 rows in her garden.Then she planted 2 tulips in each of the rows.If she bought 60 marigolds in all,does she have any remaining?If so,how many? My Solution: 7*8=56 60-56=4 4 is my answer am i right?

asked by lidia on December 1, 2011
70. ## chem

What relationship exists between H^+ ion concentration and OH^- ion concentration? Waht is the OH^- concentration of an aqueous solution with the H^+ concentration of 10^-4M. Calculate the pOH? Need help with this pls. thank you.

asked by chemdummy on November 28, 2012
71. ## science

1ml lead nitrate is being added by 1ml copper sulfate solution. What is the amount of copper nitrate and the height of its precipitation?

asked by lay on October 15, 2018
72. ## Algebra

What is the Solution to -54/x = -6? A. X = 9 B. X = -6 C. X = 6 D. X = 9 I do not really understand this question can someone help me? (Not asking for a answer) And whats the difference between |-8| and 8? Arnt they the same? One last question i don't

asked by Help please on September 23, 2016
73. ## chemistry

how many moles of hydroxide ions are there in 82.35 mL of a 2.164M Sr(OH)2 solution? i understand how to do the math for problems like these, but i don't know how to find the moles of just hydroxide ions.

asked by lyne on March 15, 2009
74. ## math

Jose claims that the equation \/ - x = 3 (this is read as the square root of negative x = 3) has no solution, since the square root of a negative number does not exist.

asked by elemantary on December 5, 2012
75. ## maths

A solution whose volume is 80% liters is made up of 40% of water and 60% of alcohol,When x liters of water is added the percentage of alcohol drops to 40% Find X

asked by Eddypiller dreamer on April 18, 2017
76. ## Chemistry

If the change in temperature of a sugar added solution of water increased its boiling point by 0.6C how many moles of sugar was added to the water?

asked by Bill on November 28, 2016
77. ## Algebra

Create an equation where the left side is a cubic function and the right side is a cube root function. Make it so that the equation has exactly one solution.

asked by Joe on January 2, 2017
78. ## chemistry

If 50.0 grams of copper metal is added to a silver nitrate solution, what mass of silver is produced if copper 2 nitrate is also formed?

asked by yadira on July 27, 2011
79. ## general chem

what is the mass percent of sodium hydroxide in a solution that is made by dissolving 8 grams of sodium hydroxide in 50 grams of h2o answer

asked by Anonymous on July 7, 2014
80. ## Chemistry

If 210 mL of isopropyl alcohol is diluted with water to a total volume of 300 mL, what is the percent by volume of isopropyl alcohol in the solution? Would it be 70%??

asked by rebekah on April 3, 2016
81. ## Chemistry

In a given experiment 36.44 mL of NaOH were required for neutralize a solution of HCl 0.35 M. Calculate the moles of NaOH present to neutralize the HCl in the titration.

asked by Anon on April 23, 2017
82. ## Chemistry

For the titration of 50.00mL of 0.1000 M ammonia with 0.1000 M HCl, calculate the pH (a) before the addition of any HCl solution (b) after 20.00mL of the acid has been added

asked by Anonymous on March 3, 2015
83. ## chem, balance

Gaseous CO2 decomposes to form the gases CO and O2. Will it be CO2--> CO+O2 or CO+O2-->CO2? I know the solution above isn't balanced yet. I just have add the 2 behind CO2 and CO to make it balanced.

asked by Anonymous on March 1, 2009
84. ## Quality control

A 50 ml sample of calcium hydroxide solution required 19.50 ml of 0.1050N HCL titration. Calculate the amount of calcium hydroxide in the 50 sample?

asked by Chariffah on January 11, 2016
85. ## Chemistry II

If the freezing point depression (DTf) is 5.62 and the freezing point depression constant (Kf) is 3.90, what is the molality of the solution? Assume that the solute is a nonelectrolyte (i = 1).

asked by Lindsay on September 8, 2009
86. ## Science Bio

Hi there, I have a quick question which I'm really stumped on. 1. When combined with Lugol's solution (iodine), does glucose and sucrose contain starch? I think glucose has starch but not sucrose. Is this right?

asked by Jenny on March 8, 2009
87. ## Chem

To prepare 5 mL of 1 mM glucose, how much glucose would you need to weigh? How do you prepare 1 mL of 1 mM NaCl using the NaCl solution you prepared in I get you would use c=n/v and get grams. But how would you answer the second part of the question?

asked by Ethan on September 30, 2018
88. ## chemistry

What is the mass/vol % ethanol in an ethanol-water solution with density of 0.875 g/ml and containing 65.0% ethanol by volume? The density of pure ethanol is 0.789 g/ml.

asked by jimbo on June 27, 2010
89. ## Chemistry

Determine the moles of Potassium Iodate present in a 0.267 m Potassium Iodate solution assuming you have 1 kg of solvent (H2O) present.

asked by Jenna on February 1, 2015
90. ## chemistry

a solution containing 100.0 mL of 0.135 M CH3COOH (ka=1.8E-5) is being titrated with 0.54 M NaOH. calculate the ph: at the equivalence point and 5 mL past the equivalence point. how much is 5 mL past? i do not know how to do it?

asked by JK on March 28, 2015
91. ## Organic Chemistry

If one gram of aspirin is dissolved in 100mL of water at 37 degrees celsius, how much aspirin will precipitate out of solution when it is cooled to 25 degrees celsius?

asked by Maggie on April 9, 2017
92. ## chemsitry

How will the osmotic pressure of an aqueous solution change as evaporation occurs? does it even change? or does it increase? evaporation will increase concentration, correct?

asked by sam on May 1, 2007
93. ## Chemistry

at 23C the reaction CaCrO4 -> Ca2+ + CrO42- has an equilibrium constant of 7.1 x 10-4. what are the equilibrium concentrations of Ca2+ and CrO42- in a saturated solution?

asked by Ry on March 22, 2010
94. ## physics

a car moving with a speed of 50 km/hr can be spotted by breaks after at least 6m.If the same car is moving with a speed of 100km/hr the minimum stopping distance is? With solution

asked by Anonymous on August 11, 2016
95. ## Chemistry II

84.6g of NH3 are dissolved in 822g of water. What are the concentrations of this solution in mass percent and molality? Mass percent= 10.3% Molality = 6.05 Mol/kg

asked by DE on July 16, 2017
96. ## chemistry

80g of NaCl are dissolved in 400g H2O. if the vapor pressure of the water is 40 mmHg , what is the vapor pressure of NaCl above the solution?

asked by sheila on February 12, 2013
97. ## college chemistry HARD

a solution containing 100.0 mL of 0.135 M CH3COOH (ka=1.8E-5) is being titrated with 0.54 M NaOH. calculate the ph: at the equivalence point and 5 mL past the equivalence point. how much is 5 mL past? i do not know how to do it?

asked by jk on March 28, 2015
98. ## Chemistry

What are the molality and mole fraction of solute in a 32.3 percent by mass aqueous solution of methanol (CH3OH)? molality = ?m mole fraction =

asked by Grace on March 13, 2014
99. ## chemistry

If 15.0 mL of glacial acetic acid (pure HC2H3O2) is diluted to 1.50 L with water, what is the pH of the resulting solution? THe density of glacial acetic acid is 1.05 g/mL

asked by Danielle on July 16, 2010
100. ## Chemistry

What is the pH of a solution prepared by mixing 50.0 mL of 0.010 mol/L HCl(aq) and 50.0 mL of 0.010 Ca(OH)2(aq)? Assume the temperature is 25 degrees celsius, where Kw = 1.0 x 10^-14 at 25 degrees celsius.

asked by iYeon on May 18, 2011