# 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

92,428 questions, page 103

An aircraft has a take-off speed 180km/h and length 250m from the start just before take-off a serious snag is detected in the engine and the aircraft failed to take-off. There is a wall at a distance 'd' = 230m ahead of the take-off point. The pilot

asked by Praveen on July 27, 2010
2. ## Chemistry

A solution of 0.211 M NaOH is used to titrate 24.0 mL of a H2SO4 solution. If 19.0 mL of the NaOH solution is required to reach the endpoint, what is the molarity of the H2SO4 solution? H2SO4(aq)+2NaOH(aq)→2H2O(l)+NaSO4(aq)

asked by Ava on July 22, 2016
3. ## CHEMISTRY

Ion Concentrations 1.) A solution is prepared by dissolving 5.00 g of stannic nitrate in enough water to make 250.0 mL of stock solution. A 15.0 mL aliquot (portion) of this stock solution is then removed and added to 75.0 mL of water. Calculate the

asked by Anonymous on October 25, 2013
4. ## Chemistry

determine the approximate molarity of a solution of NaOH prepared by diluting 10ml of 6M NaOH to a volume of 400 ml. using the solution in the first part, 24.5ml of NaOH solution was required to neutralize 26.4ml of a .150M HCl solution. find the molarity

asked by Chuck on February 28, 2008
5. ## College Algebra

A mixture of 20% disinfectant solution is to be made from 13% and 23% disinfectant solution. How much of each solution should be used if 40 gallons of the 20% solution are needed?

asked by Anonymous on September 21, 2017
6. ## Algebra

what is two ways to simplify the two problems? problem 1: (-4m^2 n^2)^3 * (2m^3 n)^-1 solution 1: -(32n^5/m^9) Solution 2: ? problem 2: (x^-(1/2) y^3)^-2/ xy^(1/3) * x^2 y^-4 solution 1: 1/x^2y^(7/2) solution 2: ?

asked by anonymous on August 30, 2018
7. ## Math, Can someone check my answers?

Can someone please check my answers? Tell whether the given equation has the ordered pair as a solution. 11. y = 6x;(3,16) 13. y = -4x; (-2,8) 15. y = x - 3/4; (2,1 1/4) Answers: 11. Not a solution 13. Has a solution 15. Has a solution

asked by Phoebe on October 31, 2014
8. ## managment ethics

How do we solve this dilemma? Assuming capitalism is based on a mutual system of trust among consumers and producers, employers and employees, is one justified in breaking a contract even if it's in the pursuit of happiness? If we used Kant's Categorical

asked by flowerpower on March 13, 2010
9. ## Math -Precal 11

Show that the point P(7,7) is on the perpendicular bisector of the line segment joining A (6,-1) to B (0, 3). Also, verify that P is the same distance from A and B. For what values of k is the line y=l tangent to the circle (x-3)^2 + (y+2)^2 = 36? Thanks!

asked by Dy on May 10, 2007
10. ## ipc

Arrange the following from the most work to the least. For each instance, calculate the total amount of work done. Show all calculations, including units of measure. 1. pushing a box of math books weighing 600 newtons a distance of 20 meters 12000J 2.

asked by Anonymous on November 4, 2009
11. ## math

if sin theta equals 3/5 and theta is second quadrant angle find tan 2 theta.my ans. was 3.442 but is wrong can you correct and show work please. thank you so much.

asked by lily on April 10, 2009
12. ## hernandez

find the molar enthalpy of vaporization for a substance, given that 3.21 mol of the substance absolve 28.4 kj of energy as heat when the substance changes from liquid to gas? show the work

13. ## math

Paul multiplied the sum of three and a number by three. This result was equal to fifty four plus twelve times the opposite of the number. What was his number? please explain and show work.

asked by Johnny on July 2, 2014
14. ## chem

how much water would you need to add to 20.0 mL of 2.0 M NaCl to make a 0.10 M solution? try the formula c1V1 = c2V2 (where c1 is the initial concentration, V1 is the initial volume, c2 is the diluted concentration and V2 is volume you are trying to find)

asked by beckii on May 22, 2007
15. ## Pre Algebra

I have work problem that I am unable to solve. Each hour Maggie baby sits she charges \$2 plus .75 for each child. Write an equation for Maggie's hourly rate h in terms of the number of children c. Solve the equation to find the hourly rate when Maggie baby

asked by Jared on November 7, 2011
16. ## Math 222

asked by Tika on April 23, 2015

Solve by applying the counting principal. When using a four number PIN, how many different PINs are possible? a*b*c=___ I need help.. how do I work this? Step by step please.

asked by Melissa on October 7, 2009
18. ## algebra

Find the square roots of 3+4i. The answer should be in the form a+bi? The answer that i got was 2+i, but it did not seem to work. Any advice on what might be happening in this problem, and how to solve it?

asked by Gem on March 31, 2015

A shot-putter puts a shot (weight = 70.1 N) that leaves his hand at distance of 1.53 m above the ground. (a) Find the work done by the gravitation force when the shot has risen to a height of 2.18 m above the ground. Include the correct sign for work. (b)

asked by Mary on February 27, 2007
20. ## chemistry

A solution is prepared by placing 23.9 g of KCl in a 0.500 L volumetric flask and adding water to dissolve the solid, then filling the flask to the mark. What is the molarity of an AgNO3 solution if 27.9 mL of the KCl solution react exactly with 45.0 mL of

asked by john on October 1, 2014
21. ## Science

A potassium permanganate solution containing 1.58g of KMnO4 per liter is added into 5 mL of an acidified iron (||) sulfate solution . Decolorizing of KMnO4 solution has been added . Calculate the mass of FeSO4 . 7H2O which has been dissolved in one liter

asked by Hasan on February 11, 2019
22. ## chemistry

You want to measure the oxalic acid contents in 20 ml of a solution. To this end, you add 100 mmol sodium dichromate to the solution. Then you titrate the remainder of the dichromate with a Fe2+ solution of 1 mM, of which you need 11 ml. What was the

asked by Anonymous on November 26, 2010
23. ## Chemistry

you add 0.05ml of 0.10M agno3 to 4ml of 2.0 nacl it forms saturated solution of agcl ag+ + cl- using a saturated solution you set up ag | ag+( test solution after reaction) || ag+(1.0ml) | ag how do we calc the equilibrium of ag+ of the test solution after

asked by Jeanine on March 30, 2011
24. ## Chemistry

A solution is prepared by placing 27.8 g of KCl in a 0.700 L volumetric flask and adding water to dissolve the solid, then filling the flask to the mark. What is the molarity of an AgNO3 solution if 22.1 mL of the KCl solution react exactly with 43.0 mL of

asked by Ali on March 2, 2014
25. ## chemistry help plz

A potassium permanganate solution containing 1.58g of KMnO4 per liter is added into 5 ml of an acidified iron (||) sulfate solution. Decolorizing of KMnO4 solution has been added .Calculate the mass of FeSo4.7H2O which has been dissolved in one liter of

asked by cynthia on January 17, 2016
26. ## Chemistry

1. What is the molar of a sodium bicarbonate solution prepared from 150 g of NaHCO3 in 150 mL solution? 2. What mass of glucose (C6H12O6) is needed to prepare a solution of 10 M, 5 L solution? 3. What volume in liters of a 4.0 M Ca(NO3)2 is needed to

asked by Anonymous on May 4, 2015

28. ## physics helppp!

The coeffcient of friction between the 7.9 kg mass and the table is 0.55, and the coeffcient of friction between the 5 kg mass and the table is 0.38. Consider the motion of the 37 kg mass which descends by the amount of y = 0.45m after releasing the system

asked by kitt on March 1, 2007
29. ## python 3

For this option, first ask the user how many items there will be. ("How many items will there be?") Then, accept a name, a price, a name, a price, etc. until you have enough name-price pairs. You should then format the receipt so that each item shows up on

asked by Anita on October 29, 2012
30. ## Differential Equations

For the following initial value problem: dy/dt=1/((y+1)(t-2)), y(0)=0 a)Find a formula for the solution. b) State the domain of definition of the solution. c) Describe what happens to the solution as it approaches the limit of its domain of definition. Why

asked by Erica on January 31, 2013
31. ## English Expressions

Think of the loci method. In this room you can find 9 fixed things and number the things systematically from top to bottom and from left to right. Then you can recall what you have memorized with ease. You need to use the 3 3 3 system. After that prepare 9

asked by John on December 12, 2007
32. ## Health, Safety, and Nutrition

good dental hygiene for young children is most dependent on: a) regular checkups every 6 months b) use of toothpaste containing fluoride c) proper tooth brushing technique d) elimination of sugars from the diet

asked by Anonymous on May 8, 2011
33. ## Pre-Algebra

You and a friend work at an orange orchard. It takes you 40 minutes to pick all of the oranges from the tree. It takes your friend 60 minutes to complete the same job. How long will it take to pick all of the oranges from an orange tree if you work

asked by Kyra on April 15, 2016
34. ## writing

Ten years ago, you started working as a clerk for DMD Medical Supplies. Six months ago, Liz Jakowski, the human resources director, promoted you to office manager. You manage two employees: Jack Snyder and Ruth Disselkoen. Your office provides secretarial

asked by Anonymous on September 8, 2013
35. ## physics

if a particle has work of 8J and doubles its speed. how much work it has done? Can we still determine work in this problem without mass

asked by eng on March 4, 2010
36. ## English

1. His method is simpler than the previous method. 1-2. His rule is much simpler than Ted's rule. 2. He is more active than Tom. 2-2. The girl is more lovable than Emily. 2-3. He is more tiresome than the boss. 2-4. He is tiresomer than the boss. 3. He is

asked by rfvv on December 16, 2015
37. ## Visual Basic

Alright, so I'm trying to code a program to where I can plug in two numbers and get a commission cost out of them. I'm having a hard time setting up the code, and I'm really looking for some guidance. I have this as the code so far: Public Class Form1

asked by Reese on February 25, 2011
38. ## Math

12x+4y= 22 and 3x-8y= -10 What are the coordinates of x and y? Use the Substitution Method. ---and--- -5x+7y= -41 and 7x+y=25 What are the coordinates of x and y? Use the Substitution Method. Please help!!! =DDD

asked by Catherine on January 25, 2008
39. ## physics

(a) What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 50.0°C and a cold reservoir temperature of -20.0°C? (b) How much heat in kilocalories would it pump into the warm environment if 3.60 multiplied by

asked by Justin on July 28, 2013
40. ## physics

(a) What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 50.0°C and a cold reservoir temperature of -20.0°C? (b) How much heat in kilocalories would it pump into the warm environment if 3.60 multiplied by

asked by Justin on July 25, 2013
41. ## physics

(a) What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 50.0°C and a cold reservoir temperature of -20.0°C? (b) How much heat in kilocalories would it pump into the warm environment if 3.60 multiplied by

asked by Justin on July 28, 2013
42. ## physics

(a) What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 50.0°C and a cold reservoir temperature of -20.0°C? (b) How much heat in kilocalories would it pump into the warm environment if 3.60 multiplied by

asked by Justin on July 26, 2013
43. ## chemistry

an aqueous solution solution of sodium borate is sometimes used to to fire-proof wood. a. what is the molarity of 2.50 L of solution that contains 1.85 moles of sodium borate? b. what is the molarity of 45.0 L of solution that contains 6.78 kg of sodium

asked by Jessica on April 7, 2013
44. ## math

Maria plans to fill the pots in her garden with soil and plant food. Maria has 8 1/4 quarts of soil and 1 1/2 quarts of plant food. Part A Each pot requires 3/4 quart of soil. For how many pots does Maria have enough soil? Show your work. Answer : 11pots

asked by Sai on January 4, 2016
45. ## Project Management

How does the responsibility matrix assist the project manager and resource managers to allocate resources to a project? Is this tool used by your Company? If so, is it effective? If not would it be effective if instituted? Why, what were/would be the

asked by Zeta on November 23, 2006

Sir Donald Bradman had scored 6996 runs in 69 completed test innings. he had one more innings to play. How many runs did he need to score in his final innings in order that his test batting average was greater than or equal to 100? You must write down the

asked by Rebecca on May 16, 2013
47. ## Algebra

Once again, I have some confusing problems for math. If you know any answers, even if you only know one, please tell me the answer and walk me through it so I can actually understand how you get to it. Thanks! #1: A space craft travels at a speed of 8/10

asked by Celina on November 5, 2008
48. ## Biology 10

Having studied biology, and listened to instructions, you recognize there is a method that could be used to decode and solve these cryptic messages. 1) TTACTCTCAAACGCCTTATGATCAAAC 2) ATAGTTGGATTTGTTAACGGACCAAAC THE CODE TABLE --------------- AAT = A ATT =

asked by Lizzie on May 31, 2008
49. ## Chemistry

Hi, I have a few chemistry problems that I'm having trouble solving. I put my attempted solutions after the problems in *'s. There was one problem I had no idea how to solve. What concentration of silver chromate (Ksp = 9.0 x 10-12) will dissolve to make a

asked by Maggie on April 12, 2010
50. ## algebra

Solve for s in this equation. Depreciation. D=C-s/n This is my answer D-C=C-s/n-c D-C=-s/n -n(D-C)=-s/n*(-n) -nD+nC=s s=n(C-D) Please chack to see if this is correct Looks fine to me. A slightly shorter (by 2 lines) rearragement is: D=C-s/n D+s/n=C s/n=C-D

asked by jessica on April 4, 2007
51. ## Accounting

Alteran Corporation purchased a machine for 1.5 million in 2006. The machine is being depreciated over a 10-year life using the sum-of-the-years'-digits method. The residual value is expected to be \$300,000. At the beginning of 2009, Alteran decided to

asked by Bobbi Loffredo on April 6, 2011
52. ## physics

an antifreeze solution is made by mixing ethylene glycol (density= 1116 kg/m^3) with water. suppose that the specific gravity of such a solution is 1.0730. assuming that the total volume of the solution is the sum of its parts, determine the volume

asked by kai on November 20, 2010
53. ## Chemistry

Suppose that 0.483 g of an unknown monoprotic weak acid, HA, is dissolved in water. Titration of the solution with 0.250 M NaOH(aq) required 42.0 mL to reach the stoichiometric point. After the addition of 21.0 mL, the pH of the solution was found to be

asked by Val on March 12, 2010
54. ## CHEM:

caluclate the volume in mL of 1.74 grams of sodium chloride from a 0.270 M solution 1.74g sodium chloride from a 0.270 M solution 7.10g ethonal from a 2.45 M solution 6.90g acetic acid (CH3COOH) from 0.606 M solution

asked by April on June 9, 2012
55. ## Chemistry

20cm3 of 0.500moldm-3 H2SO4 was consumed to neutralize 50cm3 of 0.400moldm-3 NaOH. The temperature of the system is increased by 36 degree C. The heat capacity of the calorie meter was 39 JK-1, and the heat capacity of the solution is 4.2JK-1. Find the

asked by Emma on February 21, 2013
56. ## differential equations

Search: A 8 kg mass is attached to a spring hanging from the ceiling and allowed to come to rest. assume that the spring constant is 40 n/ m and a damping constant is 3 N/m. At t=0 and external force of 2 sin(2t+PI/4)N is applied to the system. determine

asked by mike on April 18, 2011
57. ## Math

Complete each of the tasks outlined below. Task 1 You are starting a new business in which you have decided to sell two products instead of just one. Determine a business you could start and choose two products that you could sell. How much of your own

asked by Jeremy on April 12, 2018
58. ## college algebra

For the given functions f and g find the following and state the domain of each. f(x)=sqrt x; g(x)=7x-3 A.what is the domain of f*g? B. What is the domain of f/g? Please show all work.

59. ## Math

A school hall has 30 rows of seats. Each row has 28 seats.How many seats are there. please show work out.

asked by Jay on October 8, 2014
60. ## MATH

for the given functions f and g find the following and state the domain of each result f(x)=3x+1/8x-9; g(x)=5x/8x-9 A) (f+g)(x)=? B)domain of (f+g) c) (f/g)(x)=? d) domain of f/g? please show work

asked by Anonymos on September 4, 2012
61. ## Math

for the given functions f and g find the following and state the domain of each result f(x)=3x+1/8x-9; g(x)=5x/8x-9 A) (f+g)(x)=? B)domain of (f+g) c) (f/g)(x)=? d) domain of f/g? please show work

asked by Anonymos on September 4, 2012
62. ## calculus

for the given functions f&g, find the following and state the domain of each result. f(x)=5x+4/7x-8; g(x)=2x/7x-8 a.(f+g)(x)= ? what is the domain? b. (f/g)(x)= ? what is the domain? Please show work

63. ## trig

sin theta/2cos theta/2=1/2 sine theta show the identiy and work

asked by sean on October 27, 2009
64. ## social studies

explain or give a reason why slaves should have less hours to work.. REMEMBER YOU ARE THINKING LIKE A PERSON FROM 1815. NOTE: Please do not say because they work to hard and need to work less.. Be specific with your writing. Thank you

asked by Wilfredo on April 27, 2013
65. ## Computer Science-Java

Hi, I have to write a method that returns my first name, middle initial, and last name as a single String and call the method in java. So far, I have: public class ReturnName { static String fullname(String firstname, String middleinitial, String lastname)

asked by Lisa on September 23, 2009
66. ## Math

Please show me how to set it up and solve: You are making a rectangular table. The area of the table should be 10ft squared. You want the length of the table to be 1ft shorter than twice its width. What should the dimensions of the able be?

asked by Jane on February 11, 2012
67. ## math

Please show me how to set it up and solve: You are making a rectangular table. The area of the table should be 10ft squared. You want the length of the table to be 1ft shorter than twice its width. What should the dimensions of the able be?

asked by Jane on February 11, 2012
68. ## chemistry

What is the solubility of CaF2 in a buffer solution containing .30 M HCHO2 and .20 M NaCHO2? (Consider the equation CaF2(s) + 2H+(aq)--> Ca2+(aq) + 2HF(aq) and solve the equilibrium problem)

asked by Anonymous on February 29, 2012
69. ## chemistry

The pH of a solution prepared by mixing 50.0 mL of 0.125 M KOH and 50.0 mL of 0.125 M HCl is __________. i know the answer is 7.00, but im not sure how to solve it, do i create an ice chart?

asked by laney on November 23, 2010
70. ## Chem/Solution Concentrationa

How many gtams of potassium bromide(KBr), could be recovered by evaoportating 650.g of 15 percent KBr solution to dryness? Can you explain how to solve this?

asked by Terr on August 3, 2011
71. ## chem class

The pH of a solution prepared by mixing 50.0 mL of 0.125 M KOH and 50.0 mL of 0.125 M HCl is __________. i know the answer is 7.00, but im not sure how to solve it, do i create an ice chart?

asked by laney on November 24, 2010
72. ## Chemistry

What is the concentration (M) of K+ in a solution made by mixing 25.0 mL of 0.100 M KCl with 50.0 mL of 0.0500 M KCl? Can you please explain how to solve this problem. I thought to do 25*.1+50*.05=5 But that seems wrong. What should I try to do?

asked by URGENT on September 16, 2015
73. ## math,help

can someone explain to me this one as well step by step...thanks Problem #2 Solve the matrix equation AX=B for X by finding A to power. A= 2_-1_3 -3_4_-5 -4_0_6 b= 9 6 -9 Solution is: 5.43 8.22 2.12

asked by student on July 22, 2007
74. ## algebra

Solve, 0.7x+4 is equal to or less than 1.1x-7 Simplify your answer. Type and inequality symbol; then type an integer or a decimal. The solution is {x x ___ ____}

asked by june on July 28, 2011
75. ## Calculus

Find the maximum revenue using the following equations: R(x)=-x^2 +400x and C(x)=x^2+40x+100. What I've done so far is use R(x) and solve for x, which got me 0 and 400. Is that how you're supposed to start it? What happens next? (I apologize; I'm really

asked by Lindsay on December 7, 2013
76. ## chem

i don't know how to solve this. looked through all my note but i'm not sure what kind of formula i am to use or if i even need one! please help me to understand this: "calculate the work need to make room for the products in the combustion of S8(s) to

asked by marie on April 16, 2011
77. ## science

i don't know how to solve this. looked through all my note but i'm not sure what kind of formula i am to use or if i even need one! please help me to understand this: "calculate the work need to make room for the products in the combustion of S8(s) to

asked by marie on April 16, 2011
78. ## math-volume

I'm confused with how to solve this problem, so help would be great! The volume of any spherical balloon can be found by using the formula V= 4/3 pi r^3. Write an equation for r in terms of V and pi 4/3*pi*r3 = V Multiply by 3 3*(4/3)*pi*r3 = 3*V 4*pi*r3 =

asked by julie on January 21, 2007
79. ## English

Thank you very much. Here is a summary I need to prepare for tomorrow. I also need to rephrase the last sentence. Thank you very much, Writeacher! 1) Though Craig Jones is an office worker, he is also a talented singer who dreams of becoming a star. 2) He

asked by Henry2 on February 20, 2012
80. ## chemistry

The label of a bottle containing a solution So of hydrochloric acid carries the following indications :hydrochloric acid of density 1190g/l percentage by mass 37%. We introduce a volume V=4.2ml of So in a volumetric flask of volume 500ml containing about

asked by vicky on December 27, 2016
81. ## chemistry

The label of a bottle containing a solution So of hydrochloric acid carries the following indications :hydrochloric acid of density 1190g/l percentage by mass 37%. We introduce a volume V=4.2ml of So in a volumetric flask of volume 500ml containing about

asked by vicky on December 25, 2016
82. ## chemistry

what is the pH of 0.80 M NaCN? what is the pH of 0.80 M NaCN? What is the concentration of HCN in the solution? I did this so far: I 0.8..... 0....0 C -x.......x....x E 0.8-x....x....x (x)(x)/0.8-x How do I solve for x?

asked by Jenny on April 18, 2014
83. ## math,help

is this correct solve and graph the solution set: -3x+10>25 -3x> 25-10 (-3x)/(-3) > (15)/(-3) x < -5 correct.

asked by jasort20 on March 18, 2007
84. ## algebra 2

how do you solve 7x+x (x-4)=0 solution (s)/arex= find the x- intercepts of f(x)=7x+x(-4) what are the x intercepts

asked by kay on January 28, 2012
85. ## chemistry

What is the pH of a solution with [H+]= 4.75 x 10^-5? I set this up as: pH= -log[H+] =-log (4.75 x 10^-5) = 4.32 Is this the correct to solve this? thanks

asked by redgy on March 21, 2011
86. ## math

solve equation if equation has no solution state so,simply when necessary 2/3x+1x=1/6 1/x+4-1/x-2=x+2/x^2+2x-8 help me please

asked by Keaton on May 21, 2010
87. ## Algebra

Solve the following logarithm below: log_6 (-5r - 2) = log_6 ( r - 4) there is no solution to this correct?

asked by Anonymous on February 22, 2019
88. ## Physics

The drawing shows two identical systems of objects; each consists of the same three small balls connected by massless rods. In both systems the axis is perpendicular to the page, but it is located at a different place, as shown. The same force of magnitude

asked by Beth on April 1, 2012

Okay, so I totally don't understand what to do with these three. Could you please show how to solve? I don't need to see the solution, just what steps I need to take for each (every smallest detail please). 1. A box weighing 150 N is at rest on a

asked by Anonymous on October 23, 2015
90. ## Anatomy and Physiology

Urine passes from the bladder to the outside of the body through a tube called the .Urethra Muscles are attached to bones by structures called .Tendons Communication, integration, and control are the primary functions of two body systems called and .

asked by Erica on January 12, 2011
91. ## biology 2

The digestive, circulatory, respiratory, immune, and excretory systems all work together to maintain homeostasis. Discuss how a minor malfunction in one of these systems could lead to major malfunctions in others. If methods were developed to improve the

asked by sheehan on June 25, 2012
92. ## biology 2

The digestive, circulatory, respiratory, immune, and excretory systems all work together to maintain homeostasis. Discuss how a minor malfunction in one of these systems could lead to major malfunctions in others. If methods were developed to improve the

asked by rayan on October 14, 2013
93. ## solid chemestry

Consider the gold-platinum system which has a value of delta w of -4250 J/mole; (a) Calculate the enthalpy of mixing for a solution of 10% platinum and 90% gold. Express your answer in units of kJ/mole.

asked by Anonymous on November 15, 2013
94. ## chemistry

Consider the gold-platinum system which has a value of delta w of -4250 J/mole; (a) Calculate the enthalpy of mixing for a solution of 10% platinum and 90% gold. Express your answer in units of kJ/mole.

asked by Anonymous on May 2, 2013
95. ## chemistry

Consider the gold-platinum system which has a value of delta w of -4250 J/mole; (a) Calculate the enthalpy of mixing for a solution of 10% platinum and 90% gold. Express your answer in units of kJ/mole.

asked by anita on December 17, 2012
96. ## AP CHEMISTRY

A buffer, consisting of H2PO4− and HPO42−, helps control the pH of physiological fluids. Many carbonated soft drinks also use this buffer system. What is the pH of a soft drink in which the major buffer ingredients are 7.20 g of NaH2PO4 and 4.90 g of

asked by MARY on March 3, 2012
97. ## AP Chemistry

A buffer, consisting of H2PO4− and HPO42−, helps control the pH of physiological fluids. Many carbonated soft drinks also use this buffer system. What is the pH of a soft drink in which the major buffer ingredients are 7.20 g of NaH2PO4 and 4.90 g of

98. ## chemistry

write the balanced chemical equation for the reaction that would occur ewhen a base is added to a solution containing H2PO4-/HPO4^2- buffer system can you please help we write this balanced equation. thank you

asked by coco on August 14, 2015
99. ## Operations Management 10th edition

The three station work cell illustrated in Figure S7.7, has a product that must go through one of the two machines at station 1 (they are parallel) before proceeding to station 2. Station 1-Machine A-Capacity: 20 units/hr Station 2-Capacity: 5 units/

asked by Shelley on April 25, 2012
100. ## Chemistry

Benzene has a heat of vaporization of 30.72 kj/mol and a normal boiling point of 80.1 degrees celsius. At what temperature does benzene boil when the external pressure is 480 torr? Can someone show me an equation and how to solve this?

asked by Anonymous on July 19, 2011