# 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 766
1. ## AP Chemistry

Dinitrogen pentoxide (N2O5) decomposes in chloroform as a solvent to yield NO2 and O2. The decomposition is first order with a rate constant at 45 degrees Celsius of 1.0*10^-5 s^-1.Calculate the partial pressure of O2 produced from 1.00 Liter of 0.600 M

asked by Mckinley on January 5, 2017
2. ## Differential Equations

The velocity v of a freefalling skydiver is well modeled by the differential equation m*dv/dt=mg-kv^2 where m is the mass of the skydiver, g is the gravitational constant, and k is the drag coefficient determined by the position of the driver during the

asked by Erica on January 24, 2013
3. ## Calculus

Find the antiderivative of f(x)= the 5th root of x^2. A. the 5th root of (x^3)/3 + C B. (2x^1/5)/ 5 + C C. (5x^7/5)/ 7 + C

asked by Justin on August 1, 2019
4. ## Math

For his business, Gil has determined that the time it takes to ﬁnish a job varies inversely with the number of workers. This can be expressed as: ==\ensuremath{T=\frac{k}{w}}== where T = time, k is a constant, and w = number of workers. Gil’s records

5. ## Math

For his business, Gil has determined that the time it takes to finish a job varies inversely with the number of workers. This can be expressed as: ==\ensuremath{T=\frac{k}{w}}== where T = time, k is a constant, and w = number of workers. Gil’s records

asked by Plz Help on April 19, 2019
6. ## Math

For an experiment on the titration of a supernatant liquid I need to calculate the number of moles of S2O3^2-^ ion required using the volume of SrIO3 solution(supernatant liquid) from the two trials that were conducted. For both trials the volume of SrIO3

asked by Hannah on April 9, 2012

I need help solving this: 6x^2-x-12=0 I usually could do this yet i have completely forgotten what i need to do seeing as there is a number infront of the x^2 This equation is of the general form a x^2 + bx + c = 0 The solution is always x = [-b +/- sqrt

asked by elle on February 22, 2007
8. ## math

for every 12 people crossing the street, 7 of them used the pedestrian lane and the rest did not. if 48 people crossed the street, how many did not cross in the pedestrian lane? Hi Steve, the choices of answers to this question are the following: a)28;

asked by tante on November 20, 2015
9. ## algebra

I have to find the square footage of my kitchen floor with the length of one side being 8 inches. So, now I know I can make X=8. f(x)=x^2 is the template needed for this solution. If f(8)= the square footage of my kitchen floor, what will my answer be?

asked by Carly on March 2, 2011
10. ## physics

A block of mass m1 = 28 kg rests on a wedge of angle θ = 47∘ which is itself attached to a table (the wedge does not move in this problem). An inextensible string is attached to m1, passes over a frictionless pulley at the top of the wedge, and is then

asked by Anonymous on October 8, 2013
11. ## Physics 1

A textbook of mass 1.95 kg rests on a frictionless, horizontal surface. A cord attached to the book passes over a pulley whose diameter is 0.100 m , to a hanging book with mass 3.08 kg . The system is released from rest, and the books are observed to move

asked by David on April 6, 2016
12. ## Early Childhood Education

Which of these is a form of unintentional socialization a)requesting that children say please and thank you b)calculating the answer to a homework problem for a child with a learning disability c)teaching children to used a computer d)being kind to a slow

asked by Aloma on October 3, 2011
13. ## Algebra 2 ..

Solve the equation by completing the square. x^2-2=9x My answer: x=9/2+or- the sqrt. of 22.25 (but when I checked my answer the actual answer was x=9+or - the sqrt. of 89 and then all over 2) Please explain why my answer is different from the actual

asked by Anonymous on December 25, 2012
14. ## Math

Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C after 5 minutes, 84.8 C after 9 minutes; 70.2º C after 18 minute; 54.4º C after 30 minutes; 42.5ºC after

asked by Brittany on May 2, 2013
15. ## Science Plzz Help

2. Which of the following best describes the function of the endocrine system? A. It secretes chemical messengers that travel through the blood to signal changes at target cells. B. It binds chemical messengers that travel through the blood from target

asked by Mstv on June 2, 2014
16. ## Social Science

Consider racial imbalances in education, the economy, family life, housing and crimical justice system, and the health care and politics, of these societal challenges facing modern African American, which do you think are most difficult to overocme and

asked by Sharon on December 14, 2006
17. ## Physics

A little red wagon with mass 7.0kg moves in a straight line on a frictionless horizontal surface. It has an initial speed of4.00 m/s and then is pushed 3.0m in the direction of the initial velocity by a force with a magnitude of 10.0 N a.) Use the

asked by Frankie on October 15, 2012
18. ## statistics

basically i'm at the begining of the text book doing summer work it's talking about mean and stuff asked to find the mean of a set of data and given 14 different numbers the question then goes on and tells me a fifteenth number is added to the set of data

asked by statistics on July 15, 2009
19. ## Physics

An object is 21 cm in front of a diverging lens that has a focal length of -13 cm. How far in front of the lens should the object be placed so that the size of its image is reduced by a factor of 1.5? my work: 1/di=(1/-13)-(1/21) di=-8.02 m=8.02/21 m=.381

asked by Abigail on April 8, 2015
20. ## Health care

Please check my answer thanks :) You own a company in a state where state funds are not mandated for employee health insurance. What's one option for providing your employees with health care coverage for work related injuries. 1 Medicaid plans 2.

asked by Michalea on February 23, 2008
21. ## Language Arts

1. "Outstanding" is a compound word. Think about what its two parts, "out" and "standing" mean. What does "outstanding" most likely mean? a. exceptional b. obvious c. standing outside d. tall To answer questions 2 and 3 identfiy whether the capitalized

asked by Yoda on September 6, 2012
22. ## Physics Lab

Hello, we are doing a lab dealing with diffraction gratings. The problem I have is that we are supposed to find the number of slits, N, based on gathered information. I have x, L, d, m, and w, just not N, which is what I am trying to find. I also have the

asked by McPhysics on December 11, 2007
23. ## Chemistry

Consider a mixture of air and gasoline vapor in a cylinder with a piston. The original volume is 30. cm3. If the combustion of this mixture releases 980. J of energy, to what volume will the gases expand against a constant pressure of 640. torr if all the

asked by Mattie on November 18, 2010
24. ## une lab de physics

Hello, we are doing a lab dealing with diffraction gratings. The problem I have is that we are supposed to find the number of slits, N, based on gathered information. I have x, L, d, m, and w, just not N, which is what I am trying to find. I also have the

asked by URGENT on December 11, 2007
25. ## reimbursement methodologies

you work for a third party payer performing medical records review, your job is to match codes that are submitted on the claim form to documentation in the medical record. the code has been inputed but you don't see the procedure report anywhere in the

asked by uknown on March 26, 2009
26. ## Physics

A little red wagon with mass 7.0kg moves in a straight line on a frictionless horizontal surface. It has an initial speed of4.00 m/s and then is pushed 3.0m in the direction of the initial velocity by a force with a magnitude of 10.0 N a.) Use the

asked by Frankie on October 15, 2012
27. ## math

Mang jose wants to make a table which has an area of 8 m^2. The length of the table has to be 2 m longer than the width. 1. if the width of the table is p meters what will be its length? 2.form a quadratic equation that represents the situation? 3.find the

asked by rainer ferrer on August 4, 2014
28. ## Chemistry-Question 4

What mass (g) of the solute C3H8O3 should be mixed with 8270 mL of the solvent H2O to produce a solution that is 1.02 m glycerol. Molar Mass (g/mol) C3H8O3 92.09 H2O 18.015 Density (kg/L): C3H8O3 1.261 H2O 0.9982 Name/Formula: glycerol C3H8O3 water H2O

asked by Scott on September 2, 2008
29. ## math age problem

four years agoslyvia was two thirds as old as alex was then. four years from now, she will be four fifths as old as alex will be. how old are sylvia and alex now? Let S be SylVia's current age. Let A be Alex's current age. You have two equations to be

asked by plz help on April 22, 2007
30. ## computer

I need to do the degrees celcuis and fahrenheit abreviations on my computer document, can someone tell me what keys to use. oC & oF. Do you want to post them on this board or is this a document you are writing. If the latter, what program are you using. If

asked by belinda on January 11, 2007
31. ## Physics

1. The figure shows a 100-kg block being released from rest from a height of 1.0 m. It then takes 0.53 s for it to reach the floor. What is the mass m of the block on the left? There is no friction or mass in the pulley, and the connecting rope is very

asked by Shelby on December 11, 2016
32. ## History

Can someone check my history questions? Please? 1) Republicans were responsible for the passage of the Thirteenth Amendment, which effectively nullified the Three-fifths Compromise. Why was this an issue of concern for Republicans? A) because it meant that

asked by Abby on October 17, 2015
33. ## Maths

jason went shopping, he bought a watch and a pair of trainers for a total price of £53.55, this price includes a 15%loyalty discount. before the discount the trainers were priced at £38 work out the price of the watch before the discount

asked by hayden on October 26, 2017
34. ## organizational behavior

describe a motivational problem at work a. Briefly describe the problem situation b. use a theory of motivation to explain the problem c. use the theory to describe an intervention/action to change the motivational/behavior.

asked by charlotte on November 11, 2008
35. ## physics

Define the linear charge density of an infinitely long thread, if the work force field to move a charge Q = 1 nC at a distance r ₁ = 5 cm to r ₂ = 2 cm in the direction perpendicular to the filament is 50 uJ. Определить линейную

asked by lisa on May 28, 2011
36. ## Axia Math 117

I am of need of HELP. I am working on the word problems for AXIA math 117 and I do not understand the first problem. I have listed the information below. I have tried many times and I have not figured this out. My assignment is due tomorrow and I am

asked by Ann on August 6, 2010
37. ## math!!!

can you please check my work 19mm=? m ?=.19??? .017km=? cm ?=1700? 61500cm/min =? km/h ?=.615? thank youuu! .019 (missed a decimal space) 1700 is correct The last one is a little trickier. First, figure out how many km per minute you are moving: .615

asked by George on April 21, 2007
38. ## Statistics

I am trying to work a case problem, I have to take a group of numbers and using the data by product line, there is three different products lines, I need to compile a breakdown of sales by product then give a total of all three. then I need to find the

asked by Nancy on December 31, 2009
39. ## Statistics

The heights of women in a certain population have a Normal distribution with mean 64 inches and standard deviation 3.5 inches. We select three women at random from this population. Assume that their heights are independent. Find the probability that the

asked by Sarah on November 20, 2016
40. ## physics

A car is equipped with a bumper that is designed to absorb collisions. The bumper is mounted to the car using pieces of flexible tubing. The car is traveling at 1.5 m/s when it collides with a rigid black wall. If the wall exerts an average force of 44.1

asked by Vmel on October 5, 2012
41. ## phys

the 300-series shinkansen train of japan has aluminum cars, so that it can reach high speeds more easily. ten of the sixteen cars of a 300-series train have their own 300.0 kW motors, one for each of their four axles. What is the work done by one car's

asked by arriell on October 26, 2009
42. ## Julius Caesar-Act 1, Scene 1

Why does Marullus criticize the mob? Is this answer sufficient: Marullus criticizes the mob for wearing their best clothes and not their work clothes. He thinks they should be working, not celebrating. Should I add that Marullus also criticizes them

asked by Anonymous on January 11, 2009
43. ## Statistics

Suppose 52 of the students in class have a calculator and 14 have a computer. It is known that 4 do not have either a computer or calc and there are 64 students in the class. Find the probability that a randomly chosen student has a computer AND a

asked by Kim on May 26, 2009
44. ## Social studies

What development helped speed up manufacturing of products such as automobiles? A. the growth of labor unions B. the telegraph C. the assembly line D. the Bessemer process Between 1860 and 1914, what was the destination of 90 percent of European emigrants?

asked by CLementie on November 1, 2018
45. ## chemistry

Concentrated acetic acid, HC2H3O2 is 17.4 M. How many mL of concentrated acetic acid do you need to prepare 125 mL of a 0.150 M solution of acetic acid?

asked by Anonymous on March 5, 2012
46. ## Math

Mr Barkley has a box of books. He says the number of books in the box is divisible by 2,3,4,5 and 6. How many books could be in the box? Add another condition to the number of so that there is only one possible solution.

asked by Carly on September 27, 2017
47. ## Chemistry

How do I find the total mass of sample in a solution? I have: Volume of the solvent Mass of the solvent Mass of sample added I do not know what the sample is. Thanks!

asked by Mike on September 8, 2012
48. ## math 101

how much liquid containing 6% boric acid should be mixed with 2 quarts of a liquid that is 15% boric acid in order to obtain a solution that is 12% boric acid?

asked by arvee on September 13, 2016
49. ## English!

What is the relative effectiveness of Internet search engines versus searching for information in a library or searching for a product in a grocery store? IT depends on what you are looking for. I can hardly find anything except milk in a grocery store. My

asked by jen on November 30, 2006
50. ## Math

The area of a hexagon is 42 square cm. If all the dimesions of the hexagon are multiplied by 3, what will be the area of the new figure? a) 126 cm2 b) 252 cm2, c) 378 cm 2 d) 14 cm2 I took 42 cm x 3 and got 126 cm2 did I work this correctly?

asked by Daniel on May 7, 2013
51. ## algebra

At work one day Erica received 36 packages. Speedy delivered 3 times as many as Express, While Express delivered 4 more than Quick Service. How many packages did each service deliver to Erica?

asked by Sarah on November 13, 2009
52. ## english

can you corect if there is mistake i read this book two or four chapter in week because there was so many other reason that why I read like this . If don't have any homework I read two chapter a day. Sometimes I don't read the book because of other school

asked by anu on December 17, 2009
53. ## electric

When an electron moves from A to B along an electric field line in Fig. 24-29, the electric field does 3.66 x 10-19 J of work on it. What are the electric potential differences (a)VB - VA, (b)VC - VA, and (c)VC - VB? in the picture there r four field lines

asked by sweety on April 14, 2009
54. ## Math

How do you work this problem step by step? p-12 when p= 22 We don't know what book you are using and probably none of us has a copy if you told us the name of the book. Please post your question and someone will try to help. Please be specific and tell us

asked by tonya on September 7, 2006
55. ## chemistry

sodium borohydride (NaBH4) is used industrially in many organic syntheses. one way to prepare it is by reacting sodium hydride with gaseous diborone. Assuming an 86.8% yield,how many grams of NaBH4 can be prepared by reacting 7.98g of sodium hydride and

asked by help on October 4, 2011

journalize the following entries: 1, Received partial payment of $211 from J. Kronsnoble for work billed on June 7. 3. Paid for supplies purchased on June 4. my answers: 1. cash 211 accounts recvieable 211 3. supplies 258 accounts payable 258 asked by mark on September 20, 2017 57. ## Math Greg needs 234 feet of baseboard to finish trimming the floors in his house. He has 145 3/4 feet of baseboard. How much baseboard does he need to buy? 233 4/4 - 145 3/4 _________ 88 1/4 Am I working this correct? Yes. That is right! :-) Yes..... I have asked by Alisha on February 23, 2007 58. ## Statistics I have a bunch of questions to work on with this specific scenario but I was hoping someone can just help me get started on the first one because I'm having trouble getting started and I'll do the rest on my own.Thanks for any help! In a southern state, it asked by Emily on March 22, 2015 59. ## Chemisry what mass of protons would be required to just neutralize the charge of 1.0g of electrons? how do I answer this? You know the mass of an electron. Calculate how many are in 1 gram. You will need the same number of protons. Knowing the mass of a proton asked by Chris on February 8, 2007 60. ## psychology My instructor assign me of one the "senses." This the one my instructor had assign to me= “The Skin Senses”: Which includes Touch, Pressure, Temperature, and Pain. The instruction is to (Briefly describe how The Skin Senses work and its importance. asked by Sharon on June 15, 2011 61. ## magnets A particle of charge +q and mass m is initially launched at speed v in a region with a constant, uniform magnetic field of magnitude B. If the particle launched in a direction perpendicular to the magnetic field, by the time the particle has traveled a asked by Anon on December 18, 2013 62. ## Math liz earns a weekly salary of$459 and $20 per hour for each overtime hour she works. this week her total pay including salary and overtime pay was$559. write an equation to represent this situation. how many hours of overtime did liz work?

asked by Angie(: on November 9, 2011
63. ## chemistry

sodium borohydride (NaBH4) is used industrially in many organic syntheses. one way to prepare it is by reacting sodium hydride with gaseous diborone. Assuming an 86.8% yield,how many grams of NaBH4 can be prepared by reacting 7.98g of sodium hydride and

asked by hlp on October 3, 2011
64. ## communication

Angelo says, "I want to open the window while we work in here." Bruce says, "I want to keep the window closed." Jenna then asks Angelo, "Will you be satisfied if we have the window open?" Jenna is: buying time with limited agreement. offering an

asked by helen on June 3, 2010

if you draw 4 points in a square shape and try to join them all with non-crossing path you can do that, but if you draw 5 points in a shape of pentagon and try to join them it does not work. So, the question is how to prove using one of Euler's equation

asked by MURKA on November 1, 2007

liz earns a weekly salary of $459 and$20 per hour for each overtime hour she works. this week her total pay including salary and overtime pay was $559. write an equation to represent this situation. how many hours of overtime did liz work? asked by Anon on November 9, 2011 67. ## Algebra In an assembly line of a factory, which produces networking switching hubs, two robots are utilized. The first one (A) is able to produce 40 microchips per hour, whereas the second one (B) produces 30 microchips per hour. For a total production of 400 asked by Gloria on April 24, 2011 68. ## calculus A circular swimming pool has a diameter of 20 meters, the sides are 3 meters high, and the depth of the water is 2.5 meters. The acceleration due to gravity is 9.8 m/s2 and the density of water is 1000 kg/m3. How much work is required to: (a) pump all of asked by maggie on March 12, 2017 69. ## Science Turning on the switch in a flashlight starts a chemical reaction in the batteries. The chemical energy is turned to light energy and the flashlight lights up. Which part of this system is an example of a process? A. Turning on the switch is a process. B. asked by Amber on August 26, 2014 70. ## L.A the following question asks about one or more selections from your literature textbook. You may use your textbook to answer the question. Select one question to respond to. Option 1: Write a short essay in which you examine the figurative language in asked by Unknown on March 6, 2015 71. ## Physics Suppose that high-speed stroboscopic photographs show that the 200-g head of a golf club travels at 51 m/s just before it strikes a 50-g golf ball initially at rest on a tee. If the club head slows to at 36 m/s (in the same direction) after the collision, asked by help! on November 21, 2010 72. ## Physics Suppose that high-speed stroboscopic photographs show that the 200-g head of a golf club travels at 51 m/s just before it strikes a 50-g golf ball initially at rest on a tee. If the club head slows to at 36 m/s (in the same direction) after the collision, asked by help! on November 21, 2010 73. ## English What means FEEDBACK? Thank you for using the Jiskha Homework Help Forum. Here is what the Online Dictionary says: Main Entry: feed·back Pronunciation: 'fEd-"bak Function: noun Date: 1920 1 : the return to the input of a part of the output of a machine, asked by Sanjana on December 25, 2006 74. ## science hi guys I really need some help with my homework its so confusing here it is. 5.00g of glucose,C6H12O6, is dissolved in 500g of acetic acid. What is the new freezing point and boiling point for the solution? Kf,acetic acid = 3.90 Kb,acetic acid = 3.07 asked by stacy on March 24, 2007 75. ## Calculus Could someone please check my work on the following problems? I want to be sure that I'm doing them correctly; i'm just required to find the derivatives and then simplify. g(t)= t/sint g'(t)=1*sint-cost*t/(sint)^2 g'(t)=sint-cost*t/(sint)^2 y=ln(e^ax) asked by Joesph on October 19, 2008 76. ## US History what are some examples of each Core Democratic Value What do you consider the core democratic values? Please post these values and what you think are examples of them. Then we'll be glad to help you. Core Democratic Values are the ideals and qualities asked by Hela on February 15, 2007 77. ## Economics what it meant by equilibrium in economics?how equilibirum attained? The following site has an ok defintion. (I cannot post the site: instead google economics, equilibrium, definition) Market equilibrium occurs when buyers and sellers, each acting in their asked by Rohit on April 26, 2007 78. ## Biochemistry Calculate the pH that would result if 0.40mL of 1.50 M HCl is added to 12.0 mL of a 0.065 M solution of the fully deprotonated form of the tripeptide glu-asn-leu. I know I'm supposed to do an ICE table... and the equation will look like this initially: asked by Andrew on January 17, 2009 79. ## chemistry 1. the solubility of AgCl in water is 3.97x10^-6 at 0*C and 1.91X10^-4 at 100*C. calculate Ksp for AgCl at each temp. 2. using the data from #1 and the clausius- Clapeyron equation, calculate deltaH* and deltaS* for the formation of a saturated solution of asked by anonymous on March 28, 2011 80. ## Chemistry Vitamin K is involved in normal blood clotting. When 1.05 g of vitamin K is dissolved in 25.0 g of camphor, the freezing point of the solution is lowered by 3.53 °C. The freezing point and Kf constant for camphor can be found here. Calculate the molar asked by Alyssa on March 26, 2014 81. ## Chemistry 20 titration 1) oi50 . tinypic . com / ejh6vm . jpg The most suitable indicator for the titration is: A)methyl violet B)chlorophenol red C)methyl orange D)phenolphthalein 2-A base is titrated with an acid solution until the indicator changes colour. This change in the asked by Rock on October 22, 2012 82. ## chemistry Describe how one would prepare these solutions in the laboratory, using weights reagents and volumes of solutions: -500 mL of .100M K2Cr)4 stock solution from pure K2CrO4(s) -10mL of .0025M K2CrO4(aq) from .100M K2CrO4(aq) -What would the concentrations of asked by Lay on October 8, 2015 83. ## chemistry To a 100 mL volumetric flask were added 5.00 mL of 6.0 M NH3 , 14.5g of solid ammonium iodide, and 40.0 mL of 0.50 M NaOH. The flask was filled to the calibration mark with water. (a) What were the molar concentrations of hydrogen ion, hydroxide ion, and asked by alexis on August 3, 2008 84. ## English- Anyone who has read The Odyssey What is the effect of the epic simile in lines 118-131 of the excerpt from the Odyssey, Part 3? Sometimes in farmyards when the cows return well-fed from the pasture to the barn, one sees the pens give way before the calves in tumult, breaking through to asked by Cassie on January 14, 2014 85. ## Calculus Hi. In an integration solution, the integral of (1/(sqrt (8-u squared)) is written as arcsin(u/sqrt 8), but I don't see how they got it. When I did it I got (1/8)*(arcsin(u*sqrt8)). What I did was take sqrt8 common in the denominator to get it in the form asked by O_o Rion on December 5, 2009 86. ## physics A rock is tossed straight up with a velocity of 37.1 m/s. When it returns, it falls into a hole 18.8 m deep. What is the rock's velocity as it hits the bottom of the hole? Responses The gain in kinetic energy equals the loss of potential energy. (1/2) M asked by Vishnu on October 8, 2008 87. ## stats The sponosor of a local soccer tournament is responsible for writting an article for the local paper announcing the 1st, 2nd, 3rd place winners.If 10 teamsare invited to the tournament, ans th sponsor wanted to get the article written in adance so it can asked by tim on February 20, 2012 88. ## Physical science A 1.2 kg metal head of a geology hammer strikes a solid rock with a speed of 5.7 m/s. Assuming all the energy is retained by the hammer head, how much will it's temperature increase? C= .11 kcal/kgC I already set up the problem. But I keep getting the asked by Tayler on November 5, 2015 89. ## math For the first phase of the project, imagine you want to cover the backyard with decorative rock, drought tolerant plants, and trees. You need 18 tons of rock to cover the area and want to purchase 20 plants. If each ton of rock costs$70, each plant is

asked by Anonymous on February 27, 2012
90. ## physics

A 11722 kg freight train, coasting at 11 m/s, strikes a stationary 13855 kg box car. Determine the "CHANGE IN MOMENTUM" for the box car if the freight train and the box car couple together. Hint: Draw an "IF Chart" to solve. (This question has been updated

asked by Zach on April 9, 2018

Not sure how to solve this: Suppose your school is selling magazine subscriptions. Each subscription cost $20. the company pays the school half of the total sales in dollars. The school must also pay a one-time fee of$18. What is the fewest number of

asked by Alexis on October 17, 2014
92. ## math

can someone please help me? I am stuck on a problem it deals with inequalities but it is in a word problem which makes it worse for me, how would I solve this problem? Miguel's insurance company will replace his car if repair exceeds 80% of the car's

asked by Anna on November 5, 2009
93. ## Physical chemistry

Estimate the vapor pressure of sea water at 20C given that the vapor pressure of pure water is 2.338 kPa at that temperature and the solute is largely Na+ and Cl- ions, each present in about .50 mol/dm^3. I'm pretty sure the formula to use is pj=xjpj'.

asked by Melissa on September 30, 2010

Not sure how to solve this: Suppose your school is selling magazine subscriptions. Each subscription cost $20. the company pays the school half of the total sales in dollars. The school must also pay a one-time fee of$18. What is the fewest number of

asked by Alexis on October 16, 2014
95. ## Science

a few questions; 11 letters. observations involving verbal descriptions. 20 letters. the last one being t. an experiment where only one variable is changed and all others are kept constant. 16 letters. the first being s, the fourteenth being h. An

asked by Taylor on September 9, 2009
96. ## Physics , static fluids

A particular object weighs 313 N in air and 264 N when immersed in alcohol of density 0.70 g/cm3. What is the volume (in L) and the density (in kg/m3) of the object? I had origionally used the 264N as the force of buoyancy and did the Fb=density*volume*g,

asked by Andrea on November 26, 2016
97. ## Chem.

Ethanol has a heat of vaporization of 38.56 KJ/Mol. And a normal boiling point of 78.4 degrees celcius. WHAT is the vapor pressure of ethanol at 18 degrees celcius?? Okay...I don't really get out to solve for it actually. ln (P2/760 torr)= -38560/8.3145 *

asked by Joseph on February 10, 2010
98. ## Chemistry limiting reactants

A student prepares phosphorous acid by reacting solid phosphorous triodide with water PI3+H2O-->H3PO3+HI The student needs to obtain 0.250L of phosphorous acid. (d=1.651g/mL). The procedure calls for a 45.0% excess of water and a yield of 75.0%. How much

asked by Gweedo8 on May 31, 2009
99. ## Math

Stacey buys a $1000 RRSP today. After one year she adds$2500. By the end of the second year, the money has grown to \$3851 as it has earned interest over time. What rate of interest does the money earn? 1000x^2 + 2500x - 3851 Use the quadratic formula

asked by Kate on July 12, 2011
100. ## Chemistry

I need to solve latent heat. It gives me the number of ice cubes and the mass in grams (7550 grams). It wants to know how many calories would burn turning the ice into body temperature water (if body temp is 37 degrees celsius.) It gives Lm of H2O=1,44

asked by Lori on January 24, 2013