# Please observe the solution for the following two problems : (a) 2x + 18 = x + 25 (b) 3x + 5 = 7x - 15 (a) 2x + 18 = x + 25 2x - x = 25 -

30,299 questions, page 88
1. ## math

I am helping my child with this. Can you show me how to Solve word problems by writing an equation with a variable to represent the given information and then solve the equatin.

asked by prscilla on April 13, 2007
2. ## math

If 10 points are arranged on a circle, how many lines are needed to join every point to every other point once? First solve simpler problems to determine a pattern.

asked by Anonymous on April 16, 2012
3. ## Health and Human Services

I am having problems looking for a definition of data relevancy and data accessibility related to the field of health care. Can someone help me find any information regarding these definitions.

asked by Lynn on January 25, 2010
4. ## Science-PHYSICS

The metre was originally defined as a fraction of the distance from the North Pole to the equator. What problems would this definition of the metre create for people?

asked by Anonymous on November 7, 2010
5. ## Life orientation

Provide recommendations on how human problems on the community and name 2institutions or community organisations that are involved in supportingm or giving redress to these disaster

asked by Agnes on April 8, 2011
6. ## english

I am having some serious problems with parallelism. I do not understand how to use parallelism. I've read the lesson in my textbook and I've looked at different websites that help explain it, but I just can't get it. Can anyone break this down in "layman's

asked by Andy on February 18, 2011
7. ## algebra

x^2+3x-12=0 I need to factor this and thought I knew how, but I can't figure this one out. Factors of 12 are 1,12; 2,6; 3,4 and when I subtract these I don't get the 3 I need for the 3x. Am I overlooking something? My other problems were easy, so I don't

asked by meg on November 15, 2010
8. ## PreCalculus II

perform the indicated operation (3sinx-2)(sinx+1) I need someone who can help me to understand what I am supposed to be doing with this problem, a step by step would be increasingly helpful so that I can apply it to other problems like this.

asked by Amber Lance on January 30, 2013
9. ## Political Science

I need some good examples of topics to write a 5page paper on. The paper is to address any MAJOR problems of the American national government. Thank you

asked by Mel on November 24, 2009
10. ## Bobpursley can you help me with my problems below?

I had problems from yesterday but I still don't get them can you help?do you want me to repost? repost: I cant find them.

asked by Margie on March 4, 2007
11. ## Algebra

Checking two problems : 1. x^2-7x+12 / x^2-16 = (x-3)(x-4) / (x-4)(x+4) (x-4) cancels out Answer (x-3)/(x+4) 2. x^2-3x+2/7x-14 divide by x^2-1/7x+7 x^2-3x+2/7x-14 * 7x+7/x^2-1 (x-1)(x-2)7(x+1)/7(x-2)(x-1)(x+1) To me it looks like everything cancels out, is

asked by John on November 6, 2007
12. ## Algebra

show me step by step how to solve t hese problems. 5 7/8 +(3 1/3 - 1 1/2) i cannot get this down please help

asked by Sharon on October 15, 2013
13. ## math

how do you solve these problems? 1.2x/3 + 1/3 - x/8= 2/3 2. 3n + 9/10 + n/5= -2 3/10 3. 3k/4 - 28 - 2k/3 = 37 thank you can you please show me step by step how you got the answer?

asked by Sara! on June 3, 2010
14. ## Algebra

Can someone help me factor: 4u^3+3u^2-9u+2 I don’t understand how to factor 4 terms problems.

asked by P on March 28, 2019
15. ## Math-Fractions

How would I solve these two problems. (We have to simplify our answer) 5/7 divided by 8/21 12/7 divided by 9/21

asked by Joe on January 19, 2010
16. ## Math

How do I find (a) f*g (b) g*f (c) f*f of these problems? If you can, please show me step by step ^___^ thank you 1)f(x)=x^2 2) f(x)=3x+5

asked by Sira on September 30, 2012
17. ## Geometry B: Unit 3: Similarity Lesson5 Practice

If you have done this please help me with just the practice question I have already done the quiz I just need help with the practice problems because they are in more detail.

asked by Blair on March 4, 2016
18. ## life orientation

what are the problems that the community faced? what did the community members do before the protest?

asked by Anonymous on June 2, 2015
19. ## algebra 1b

i need to know how to solve certain problems like this 4x=2y-10 x+2y=5 i need examples of this and shown to me step by step

asked by erica on March 21, 2009
20. ## algebra NEED HELP

I've tried to do these problems multiple times and I'm just so confused. 1. (root x-5) + 5 = 0 2. (root 2-7x) = 2x Thanks!

asked by Liz on April 29, 2015
21. ## A question

in the the theories of aggression what is something you could take and use with the people in your life who have problems with aggression?

asked by Bryan on April 22, 2009
22. ## pre algebra

How do I figure out problems like 52 = p +(-41)? I tried doing the steps but I got -11, which is wrong. Can someone walk me through the steps?

asked by john on November 13, 2009
23. ## Chemistry

An impure sample of (COOH)2 · 2 H2O that has a mass of 2.9 g was dissolved in water and titrated with standard NaOH solution. The titration required 32.4 mL of 0.144 mo- lar NaOH solution. Calculate the percent (COOH)2 · 2 H2O in the sample.

asked by Bella on April 1, 2016
24. ## Chemistry

One half-cell in a voltaic cell is constructed from a silver wire electrode in a .25 M solution of AgNO3 . The other half-cell consists of a zinc electrode in a .001 M solution of Zn(NO3)2. Calculate the cell potential I have no idea and am so stressed,

asked by Anonymous on November 18, 2015
25. ## Algebra-Please check my calculations

Could you please check my answers and help with the ones I can't figure out- 1. Solution to the radical function sqrt(1/2x+1) = 1 is x = 0 True or False I think it is true according to my calculations 2.Solve x = sqrt(8x) 8x = x^2 x^2 - 8x = 0 x(x-8) = 0 x

asked by JayLynne-I had misprint in previous posting on October 19, 2010
26. ## pre-calculus

solve the logarithmic equation. be sure to reject any value of x that is not in the domain of the orginal logarithmic expression. In square root of x+2=2 (If I try to make the square root sign it will not come out right so I wrote it out instead) What is

27. ## chem

A student mixes 5 mL of 2.00 x 10^-3 M Fe(NO3)3 with 5 mL 2.00 x 10 ^-3 M KSCN. They find that in the equilibrium mixture concentration of FeSCN^2+ is 1.40 x 10^-4 M. Find each of the following: the initial concentration in solution for Fe^3+ and SCN, the

asked by Grant on October 14, 2015
28. ## Chemistry

In the following experiment, a coffee-cup calorimeter containing 100 \rm mL of \rm H_2O is used. The initial temperature of the calorimeter is 23.0 \rm ^{\circ}C. If 9.80 g of \rm CaCl_2 is added to the calorimeter, what will be the final temperature of

asked by Ali on June 17, 2012
29. ## College Chemistry

Substances A, B, and C can all act as oxidizing agents. In solution, A is green, B is yellow, and C is red. In the reactions in which they participate, they are reduced to A-, B-, and C- ions, all of which are colorless. When a solution of C is mixed with

asked by Lisa on November 10, 2010
30. ## Solutions

When adding 100mL of water to a solution of 50grams of KI in 400mL of water, the total amount of KI in the new solution will be how many grams? Did I miss something here? The total amount of KI, if no extra is added and none taken away, MUST be 50 grams?

asked by Kellie on February 25, 2007
31. ## Qualitative analysis ( Chemistry)

A solution x forms a white precipitate with dilute sulfur in acid and also with aqueous silver nitrate. What could solution x contain? A) Barium Chloride B) Barium nitrate C) Magnesium chloride D) Magnesium chlorine Could someone tell me how to get the

asked by Cheezel on November 17, 2016
32. ## Chemistry

When 23.6 of calcium chloirde CaCl2 was dissolved in water in a calorimeter, the temperature rose from 25.0 degrees C to 21.56 degrees C. If the heat capacity of the solution and the calorimeter is 1071 J/ degrees C, what is the enthalpy change when 1 mol

asked by Lauren on November 1, 2007
33. ## chemistry

an unsaturated solution is made by completely dissolving 20.0 grams of NaNO3 in 100.0 grams of water at 20.0 degrees celcius. show a corrct numerical sat up for calculating the number of moles of nano3(gram-formula mass = 85.0 grams per mole) used to make

asked by nicole on April 23, 2012
34. ## Chemistry

Balance the following equation for a half reaction that occurs in acidic solution. Use e– as the symbol for an electron. U^4+ --> UO2^+ There is a hint: In acidic solution, you may add H2O and H as needed to balance oxygen and hydrogen. When finished,

asked by Clueless on April 28, 2014
35. ## Chemistry/pH- Weak Acid

Hi again! I have a new question, Can you help me? Consider 50.0 mL of a solution of a weak acid HA (Ka = 1.00.E-6), which has a pH of 4.000. What volume of water must be added to make the pH = 5.000? My Calculations: To calculate the concentration of x, I

asked by Mary on August 17, 2008
36. ## college Chemistry

A 21.18 mL of 0.250 M NaOH is titrated with a H2SO4 solution. The initial volume of H2SO4 was 13.28 and the final volume of H2SO4 was 28.29 mL when the solution turned very slightly pink. What is the concentration of NaOH?

asked by Ivy on December 6, 2010
37. ## mixture

Sugar solution is composed of 40 grams of sugar and 200 grams of water. How many grams of sugar must be added to make a 60% sugar solution? (Kindly write the equation..... tnx)

asked by HELP HELP MNHS on November 22, 2012
38. ## Chemistry

A reference solution is to be prepared with 5 PPM parabenzopyrene (molecular weight = 252). The quantity of parabenzopyrene required for preparing one litre 5 PPM solution is (A) 252 mg (B) 25.2 mg (C) 5 mg (D) 252 g

asked by rohit on June 25, 2013
39. ## Chemistry Help Pls!!!

A 21.18 mL of 0.250 M NaOH is titrated with a H2SO4 solution. The initial volume of H2SO4 was 13.28 and the final volume of H2SO4 was 28.29 mL when the solution turned very slightly pink. What is the concentration of NaOH?

asked by Jerome on December 6, 2010
40. ## college Chemistry

A 21.18 mL of 0.250 M NaOH is titrated with a H2SO4 solution. The initial volume of H2SO4 was 13.28 and the final volume of H2SO4 was 28.29 mL when the solution turned very slightly pink. What is the concentration of NaOH?

asked by Ivy on December 7, 2010
41. ## Chemistry

What initial concentration of Cd2+ is required to result in a cell potential of 0.200 V in a voltaic cell constructed by connecting a nickel electrode that is dipped into 1.00 M NiSO4 solution to a cadmium electrode that is dipped into a solution

asked by Richard Swasley on April 2, 2017
42. ## Chemistry

When an aqueous solution of sodium hydroxide, NaOH, is added to an aqueous solution of chromium(III) nitrate, Cr(NO3)3, a precipitate of chromium(III) hydroxide, Cr(OH)3, forms. Write a balanced net ionic equation for this reaction.

asked by Tina on March 1, 2016
43. ## chem

An impure sample of (COOH)2 · 2 H2O that has a mass of 4.3 g was dissolved in water and titrated with standard NaOH solution. The titration required 44.5 mL of 0.11 mo- lar NaOH solution. Calculate the percent (COOH)2 · 2 H2O in the sample. Answer in

asked by Big Boy on April 4, 2019
44. ## chemistry

In the following experiment, a coffee-cup calorimeter containing 100ml of H2O is used. The initial temperature of the calorimeter is 23 degrees celcius. If 7.20g of CaCl2 is added to the calorimeter, what will be the final temperature of the solution in

asked by kayla on October 3, 2008
45. ## chemistry

An ideal liquid solution has two volatile components. In the vapor in equilibrium with the solution, the mole fractions of the components are (a) both 0.50; (b) equal, but not necessarily 0.50; (c) not very likely to be equal; (d) 1.00 for the solvent and

asked by anonymous on February 20, 2010
46. ## Chemistry

Suppose you have 5.00g of powdered magnesium metal, 1.00L of 2.00M potassium nitrate solution, and 1.00L of a 2.00M silver nitrate solution. a) Which one of the solutions will react with the magnesium powder? I don't understand how to go about answering

asked by Feufolia on February 22, 2016
47. ## CHEMISTRY !!! HELP !

Calculate the pH of the solution after the addition of the following amounts of 0.0617 M HNO3 to a 70.0 mL solution of 0.0750 M aziridine. The pKa of aziridinium is 8.04. 1)Volume of HNO3 equal to the equivalence point 2)89.5mL of HNO3 I got pH= 7.37 for 1

asked by Owen on September 26, 2015
48. ## Chemistry

Consider the reaction: M + 2HCl ¨ MCl2 + H2 When 0.85 mol of the metal, M, reacted with an aqueous HCl solution (the HCl is in excess), the temperature of the solution rose because the reaction produced 6795 J of heat. What is ∆H in kJ per mol of M

asked by Jessica on May 4, 2015
49. ## Biology

A stock protein sample that has a concentration of 250.0mg/ml. You need to dilute this sample to 20.0 mg/ml in buffer. The final volume of the diluted solution is 5.0ml. how much of the stock protein solution and buffer are required to achieve this? Answer

asked by Matthew on October 12, 2017
50. ## chemistry

a large 1.5 x 10^6liter tank contains water polluted with lead (II) nitrate at a molarity concentraion of 2.5 x 10^-6 M to the tank, you add 59.7 liters of 0.075 M potasium chloride solution. did you add enough potassium chloride to remove all the lead(II)

asked by tom on February 26, 2012
51. ## Chemistry

Can someone please explain this problem to me step by step pleaseeeeeee? In the following acid—base neutralization reaction HNO3 (aq)+ KOH (aq)---KNO3(aq) + H2O(I) What is the molarity (M) of an HNO3 solution if 50.0ml is needed to react with 25.0ml of

asked by Tasha on October 23, 2012
52. ## math

How many quarts of water must be added to 18 quarts of a 32% alcohol solution to dilute it to a solution that is only 12% alcohol.

asked by john on July 30, 2014
53. ## chem

how would you prepare 445 grams of solution containing 13% mass HCL from 34.1 mass % of HCL solution

asked by SDW on February 24, 2014
54. ## Math

How many centiliters of pure acid must be added to 6 centiliters of a 50% acid solution to obtain a 70% solution?

asked by Monica on November 24, 2010
55. ## math

How much stock solution of hydrogen peroxide 8% will you need to make 320ml of hydrogen peroxide 2% solution?

asked by Anonymous on December 9, 2012
56. ## chemistry

Prepare 600mL of a 100mM solution of glucose in 0.9% NaCl. Also need to prepare the 0.9% NaCl solution.

asked by margrav2 on December 5, 2010
57. ## Please check my math questions.

I only need y'all to check my responses. Thanks in advance! Is (0,3) a solution to the equation y=x+3 Yes**My choice No Is (1,-4) a solution to the equation y=-2x Yes No**My choice

asked by Derpy Pegasus on September 30, 2015
58. ## AB Calculus

So I'm supposed to verify the solution of the differential equation. The solution is y=e^(-x). The differential equation is 3y' + 4y = e^(-x). What is the problem asking me to do here?

asked by Hannah on February 27, 2012
59. ## Math

You have 8 liters of a 60% alcohol solution. How many liters of water should be added to make a 35% alcohol solution?.

60. ## chemistry

how to make 3.0 liters of a 0.98 molar HCl solution from a 10.5 molar HCl stock solution.

asked by florence on September 18, 2013
61. ## algebra

how many liters of water should be added to a 20 liters of 40% acid solution to obtain a 30% acid solution?

62. ## Alg

order your answers from smallest to largest x, then from smallest to largest y. If there is no solution, enter NO Solution 2x^2+3y^2=48 x^2-y^2=4 (x,y)= ( , ) (, ) (x,y)= ( , ) (, ) (x,y)= ( , ) (, ) (x,y)= ( , ) (, )

asked by K on May 2, 2014
63. ## Chemistry

When 23.5 mL of 0.12 M HCl are added to 50.0 mL of a 0.15 M solution of a weak monoprotic base, the pH of the solution is 10.00. What is the Kb of the weak base?

asked by . on March 10, 2019
64. ## Chemistry

How would I find the volume of 30% hydrogen peroxide solution from 20mL of 3% hydrogen peroxide solution?

asked by Zach on September 28, 2012
65. ## Chemistry

how would I make 5.5 liters of a 2.5 molar HCl solution from a 10.5 molar HCl stock solution?

asked by jake on June 12, 2011
66. ## Chemistry

A weighed amount of sodium chloride is completely dissolved in a measured volume of 4.00 M ammonia solution at ice temperature, and carbon dioxide is bubbled in. Assume that sodium bicarbonate is formed until the limiting reagent is entirely used up. The

asked by JUNDY on February 25, 2015
67. ## Chem

Consider a solution that contains both C5H5N and C5H5NHNO3. (Kb for pyridine, C5H5N, is 4.0 x 10^-4) (a) Calculate the ratio of [C5H5N]/[C5H5NH+] if the solution has a pH of 4.50. (b) Calculate the ratio of [C5H5N]/[C5H5NH+] if the solution has a pH of

asked by Fred on April 7, 2009
68. ## urgent chem help ( dr bob plz)

A particular household ammonia solution (d= 0.97g/mL) is 6.8% NH3 by mass. How many milliliters of this solution should be diluted with water to produce 650 mL of a solution with pH = 11.50? ============================ first i did was ph = 11.50 PH=

asked by javeya on February 17, 2009
69. ## chemistry

what evidence supports the clarification that H2Se 03 is an acid and how do i identify the positive ions present inthe aqueous solution I am a little confused by the word "clarification" in your question. What evidence do you have? Could you measure the pH

asked by mickey on January 30, 2007
70. ## chemistry

suppose that you have a micro pipet which delivers 100 drops per cubic centimeter, and a solution of 5.0% by volume of oil in alcohol. if you had used 10 drops of this solution, how many cubic centimeters of pure oil would be left after evaporation of the

asked by diana on September 18, 2016
71. ## chemistry

In the following experiment, a coffee-cup calorimeter containing 100 mL of H2O is used. The initial temperature of the calorimeter is 23 degrees Celsius. If 4.00 g of CaCl2 is added to the calorimeter, what will be the final temperature of the solution in

asked by Katherine on October 19, 2009
72. ## College Chemistry Lab

Determine the molarity of FD&C Yellow #5 in the following solution that's prepared by mixing the dye solution with water and alcohol. None of the solutes react with one another. 6.35x10^-5M FD&C Yellow #5 = 6.50mL deionized water = 6.50mL ethyl alcohol =

asked by L** on March 16, 2010
73. ## Chemistry

You are trying to find the heat (qrxn) in joules. C is 4.19 Change in temp is -2.2 I don't know how to find the mass if they tell me that the density of the solution is 1.02 and that the volume of water is 100 mL (Should I use the mass of the solution I

asked by Sary on November 3, 2017
74. ## chemistry

You extract the iron from a tablet and dilute that to 350.0 ml in a volumetric flask. You transfer 0.500 ml of this solution to a 75.0 ml volumetric flask and dilute this to volume. When you measure the concentration of this solution, you find that it is

asked by Kelcie on October 28, 2012
75. ## Chemistry

You extract the iron from a tablet and dilute that to 250.0 ml in a volumetric flask. You transfer 0.400 ml of this solution to a 25.0 ml volumetric flask and dilute this to volume. When you measure the concentration of this solution, you find that it is

asked by Spider on April 11, 2013
76. ## chemistry

Concentrated phosphoric acid,H3PO4 was added slowly into some water to produce 5.0dm^3 of a dilute acid solution.100g of the pure phosphoric acid,H3PO4 was present in the solution.Find the concentration of the acid,in g dm^-3.

asked by mandy on May 5, 2014
77. ## chemistry

At 29.6 degrees C, pure water has a vapor pressure of 31.1 torr. A solution is prepared by adding 86.7 g of "L" a nonvolatile nonelectrolyte to 390.0 g of water. The vapor pressure of the resulting solution is 27.6 torr. Calculate the molar mass of "L"

asked by J on February 13, 2015
78. ## Chemistry

a 15ml sample of sulfuric acid was titrated against a solution of .0100 mol per litre of sodium hydroxide. to bring about neutralization, 25.00 ml of sodium hydroxide solution was required. calculate the concentration of the sulfuric acid

asked by Omaaaaaaaar on January 24, 2013
79. ## Chemistry

A buffer is prepared by mixing 0.30 mole of formic acid (HCNO2) and 0.20 mole of sodium formate (NaCHO2) in enough water to make 0.50 liter of solution. Ka of formic acid is 1.7 x 10-4. Calculate the pH of the resulting buffer solution.

asked by Sam on March 7, 2012
80. ## science

Please help. Concentrated hydrochloric acid is a 38% w/w solution of HCL in water and has a density of 1.18g/ml. How many millilitres of concentrated hydrochloric acid are needed to prepare 500ml of a 1:200 w/v HCL solution? My answer is 2.12ml. I'm not

asked by Peter on May 9, 2012
81. ## Chem2

Copper(II) iodate precipitates from iodate solution. The formula of the precipitate is CU(IO3)2. A saturated solution of this substance was made in 0.01 M KLO3. The copper concentration was found to be 0.0013 M. Determine the [IO3-] and Ksp of the

asked by Sammie on October 12, 2010
82. ## Chemistry

A solution of potassium hydroxide is in equilibrium with an undissolved solute at 45 degrees Celsius. What will happen to the mass of the potassium hydroxide if the temperature is raised to 50 degrees Celsius? (Given that heat of solution is

asked by Dayton on December 14, 2012
83. ## Algebra

please check my answers. thanxs! Solve the polynomial inequality and graph the solution set on a number line. Express the solution set in interval notation. x^2 - 6x + 5 > 0 -I got (-ininity,1) u (5, infinity) x^2 - 3x - 18 < 0 -I got (-infinity,-3) u (6,

asked by Liz on October 24, 2007
84. ## chemistry

Please help. Concentrated hydrochloric acid is a 38% w/w solution of HCL in water and has a density of 1.18g/ml. How many millilitres of concentrated hydrochloric acid are needed to prepare 500ml of a 1:200 w/v HCL solution? My answer is 2.12ml. I'm not

asked by Peter on May 7, 2012
85. ## chemsitry

100ml of h2s04 solution having molarity 1M and density 1.5g/ml is mixed with 400ml of water. calculate final molarity of h2s04 solution, if final density is 1.25g/ml. Answer 0.227M Who helps me to solve it Thank you a lot

asked by Ferda on December 28, 2014
86. ## Inequality

please check my answers. thanxs! Solve the polynomial inequality and graph the solution set on a number line. Express the solution set in interval notation. x^2 - 6x + 5 > 0 -I got (-ininity,1) u (5, infinity) x^2 - 3x - 18 < 0 -I got (-infinity,-3) u (6,

asked by Liz on October 23, 2007
87. ## Pre-Cal

An equation is given. (Enter your answers as a comma-separated list. Round terms to three decimal places where appropriate. If there is no solution, enter NO SOLUTION.) 2 cos 2θ − 1 = 0 a). Find all solutions of the equations answer--> θ= (π+6nπ)/6 ,

asked by Amber on July 11, 2016
88. ## Chemistry

(Ksp= 5.0*10^-13) 1) Calculate the molar solubility of AgBr in 3.0×10^−2 M AgNO3 solution. 2) calculate the molar solubility of AgBr in 0.10 M NaBr solution. I tried solving using this the quadratic formula, but it didn't work. I started with these

asked by Jonah on March 17, 2013
89. ## chem

An impure sample of (COOH)2 ·2 H2O that has a mass of 3.4 g was dissolved in water and titrated with standard NaOH solution. The titration required 42.7 mL of 0.156 molar NaOH solution. Calculate the percent (COOH)2 · 2 H2O in the sample. Answer in units

asked by lois on April 3, 2016
90. ## Chemistry

At 21.0 °C, a solution of 23.71 g of a nonvolatile, nonpolar compound in 30.64 g of ethylbromide, C2H5Br, had a vapor pressure of 319.7 torr. The vapor pressure of pure ethyl bromide at this temperature is 400.0 torr. Assuming an ideal solution, what is

asked by Luke on July 14, 2014
91. ## chemistry

The volume of an aqueous solution of NaCl at 25oC is expressed as a function of the amount m in 1kg of solvent in the following form; V/cm3 = 1000.94 + 16.4 (m/mol) + 2.14 (m/mol)3/2 - 0.0027 (m/mol)5/2 Find the partial molar volume of NaCl and water in 1

asked by pritisha on August 13, 2018
92. ## chemistry

A sample of 10.00g of a solid unknown was dissolved in 25.00g of water. Assuming that pure water freezes at 0.0°C and the solution freezes at -5.58°C, what is the molal concentration of the solution? What is the molar mass of the solid? Show your

asked by paula on January 24, 2015
93. ## Chemistry

CaCl2(s) Ca2+(aq) + 2 Cl-(aq) H = -81.5 kJ A 14.0 g sample of CaCl2 is dissolved in 130. g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming the solution has a

asked by Joe on November 10, 2007
94. ## chemistry

When 25.0 mL of 1.0 M H2SO4 is added to 50.0 mL of 1.0 M NaOH at 25.0 °C in a calorimeter, the temperature of the aqueous solution increases to 33.9 °C. Assuming the specific heat of the solution is 4.18 J/(g·°C), that its density is 1.00 g/mL, and

asked by nobody on March 14, 2013
95. ## chemistry

A solution is made by dissolving 46.5g of urea, (CH4N2O) a nonelectrolyte, in 316g of water. Calculate the vapour pressure of this solution at 40 oC. (ans in torr, note the vapour pressure of pure water at 40 oC is 55.3 torr.) I have been struggling with

asked by wini on February 17, 2011
96. ## Chemistry

You have a stock 0.100 M solution of KMnO4 and a series of 100-mL volumetric flasks. What volumes of the stock solution will you have to pipet into the flasks to prepare standards of 1.00, 2.00, 5.00, and 10.0x10^-3M KMnO4 solutions? I tried using

asked by confused on March 19, 2013
97. ## intermediate algebra

inequalities –1 ≤ x – 3 ≤ 5 –2x – 5 < –2 or x – 3 < –10 Be careful of how a negative x-term is handled in the solving process. Show all math work arriving at the solutions. •Show the solution sets written algebraically and as a union or

asked by sean on March 15, 2017
98. ## ap chem

a solution is prepared by dissolving 4.87 g of sodium dichromate in 25.0 ml of water. (d=1.00g/mL).calculate a. the mass percent of sodium dichromate in the solution. b. the mass percent o water in the solution. c the mole fraction of sodium dichromate in

asked by just on February 20, 2007
99. ## algebra

Mixture Problems Template – Price Problems Copy the problem from the lesson: 1. A store manager wishes to reduce the price on her fresh ground coffee by mixing two grades. If she has 50 pounds of coffee which sells for \$10 per pound, how much coffee

asked by bianca on November 17, 2010
100. ## chemistry

A certain substance has a solubility of 12 grams in 100 grams of water at 20°C. This means that _____ the substance will begin to dissolve when 12 grams are present in solution when 12 grams of the substance are stirred into a beaker with 100 g of water,

asked by Bleaktuber on January 24, 2019