# 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 548
1. ## physics

Three particles, each of mass 3.0 kg, are fastened to each other and to a rotation axis by three massless strings, each 0.360 m long, as shown in the Figure. The combination rotates around the rotation axis with an angular velocity of 19.0 rad/s in such a

asked by Katie on March 16, 2012
2. ## math,correction

Can somoene helpme plz... Simplify radical 7 * radical 14 wouldn't it be radical (7*14) = radical (98) = 7radical (14) = 7 radical (2) The result is right, you erred on the next to last line. So how do i show that step that i am wrong in...

asked by jasmine20 on March 29, 2007
3. ## Setting up a chem problem

Magnesium reacts with water in the equation, Mg+2H²O-->Mg(OH)²+H². You have 8.1 g of magnesium available. This means you will need ___ g of water to use all the magnesium. This seems sorta simple, but how can i set it up? These are stoichiometry

asked by Briana on January 18, 2007
4. ## sociology

What kind of measures do sociologists use to calculate prejudice other giving a person an implicit association test? Essentially prejudice depends on how you divide people into "us" and "them" categories. There are various types of scales used (e.g.,

asked by Cindy on October 13, 2006
5. ## Health (Anonymous)

I have done all the leg work I was just wondering if some1 could let me know how I did is all. 1- The process of breaking a complex substance down into smaller components is called? A- neutralization B- metabolism C- anabolism D- catabolism Answer- C 2- An

asked by B B on May 3, 2010
6. ## Ochem

A student needed to determine the percent composition of a mixture that contained fluorene and benzoic acid. The student took 283 mg of the mixture and used the extraction method to separate the components. Then both compounds were recrystallized and

asked by Lindsay on October 19, 2011
7. ## Chemistry

2H202-> 2H2O + O2 Suppose you carry out the decomposition using 25.0 mL of a 2.00M hydrogen peroxide solution and obtain the following: 8.62 mL of gas is collected in 120 seconds. How many moles of oxygen are produced per second?

asked by Jessica on September 21, 2015
8. ## chemistry

When 0.25M (Molarity) aqueous solutions of ammonium chloride and lead (II) nitrate are mixed a precipitate forms. How many grams of solid would be produced by mixing 250 mL of each solution?

asked by Palak on January 5, 2011
9. ## chemistry

The formation constant* of [M(CN)4]2– is 7.70 × 1016, where M is a generic metal. A 0.170-mole quantity of M(NO3)2 is added to a liter of 1.040 M NaCN solution. What is the concentration of M2 ions at equilibrium?

asked by Emily on March 25, 2016
10. ## chemistry

calculate the number of g fes04 that will be oxidized by 24ml of a 250N Kmn04 in a solution acidified with sulfuric acid. The unbalanced equation for the reaction. The answer 0.912g Who helps

asked by Fai on February 9, 2013
11. ## science

1) At body temperature of 36.5 ° C the osmotic pressure of the blood is of 7.80 atm. Calculate the mass of glucose (C6H12O6) that must be added to one liter of a solution containing 5 g / L of NaCl to be able to inject directly into a vein.

asked by michael on March 14, 2017
12. ## chemistry

A 0.0230 g sample of an unknown was dissolved in 2.260 g of benzene. The molality of this solution, determined by freezing point depression, was 0.0408 m. What is the molecular weight of the unknow substance?

asked by Crystal on October 4, 2012
13. ## Chemistry

In solution, hypochlorite ion is known to decompose with a second-order rate law. If [ClO-]0 = 0.0570 M and k = 2.06x10-4 M-1·min-1, calculate the half-life for this reaction 2ClO-  2Cl- + O2.

asked by Amber on September 6, 2012
14. ## college chemistry

Sodium chloride is added to water (at 25⁰C) until it is saturated. Calculate the Cl- concentration in such a solution. Useful data are provided below. ∆G⁰f (kJ/mole): NaCl (s) -384 Na+ (aq) -262 Cl- (aq) -131

asked by Stephanie on April 28, 2010
15. ## Trig

I need help, I don't remember what to do. Find all solutions of the equation in the interval [0,2pi]. (2cosè+sqrt3)(cscè+1)=0 Write your answer in radians in terms of pi. If there is more than one solution, separate them with commas.

asked by Rachal on May 14, 2011
16. ## Chemistry

Can someone please check my answer...thank you! According to Raoult's law, as the mole fraction of dissolved nonvolatile solute in a given amount of solvent increases, the solution vapor pressure: VARIES AT RANDOM?

asked by anonymous on December 18, 2007
17. ## Physics

If I have a solution of standard household vinegar and 3% peroxide mixed in equal parts and one drop is dropped through the sure how far must it fall before hitting an 80 degree steel plate to produce vaporization?

asked by BkB on December 1, 2016
18. ## chemistry

The redox reaction below occurs in acidic solution. Balance it with the smallest whole number coefficients and determine the coefficient for H+. MnO4-(aq) + HNO2(aq) ---> Mn2+(aq) + NO3-(aq) when i did it..i got the answer as1...but im not to sure..help?

asked by John on November 7, 2009
19. ## math

This week’s focus is on systems of equations. Describe a profession that might use this on a regular basis, and give an example with a solution (not covered in the text) of a math problem with a real-life application.

asked by Leo on February 10, 2012
20. ## Chemistry

5.00mL of .00500 M ferric nitrate is added to 5.00 Ml of nitric acid and 10.0 Ml of .00250 M thiocyanate solution. Calculate the initial FE^3+ concentration before reaction. I know F3^3+=Cfe-[FESCN^2+] after that I have no idea what to do. Help please??

asked by Koo on February 21, 2010
21. ## Chemistry

If the pH of a solution is 6, what are the hydrogen- and hydroxide-ion concentrations? The PH of a 0.1 M MCl (M+ is an unknown cation) was found to be 4.7. Write the net ionic equation for the hydrolysis of M+ and its corresponding equilibrium expression

asked by Jefferson on February 19, 2013
22. ## Vocabulary

Unlike the colorful parasols of centuries ago, many modern umbrellas are a ________ black. a. unique b. traditional c. harmless d. boring The solution will be a synonym of "innocuous." The answer's c, right? Or would it be b?

asked by Anonymous on March 6, 2008
23. ## Chemistry

The electrolysis of a water solution of H2SO4 produces, after a certain period of time, 20L of H2, (T=25° and P=1); calculate the amount of Coulomb necessary for the hydrogen production and the moles of molecular oxygen developed.

asked by Mousa on July 6, 2012
24. ## 12 Chemistry

I was just wondering if you could tell me what evidence there is that supports the statement: carboxylic acids are soluble in an aqueous solution. I have an answer all ready, and I have searched the internet, but I was just interested in a little

asked by FOR A SCIENCE TEACHER ONLY!!! on February 18, 2008
25. ## vectors

ABCDEF is a regular hexagon with sides of unit length. Find the magnitude and the direction of AB+AC+AD+AE+AF. The textbook answer: 6, 60 degrees to AB A full solution with steps will be greatly appreciated. Thank you :)

asked by Alex on May 20, 2018
26. ## science

How much heat is gained (in Joules) by the water (qwater) when a chemical reaction takes place in 100.0 mL aqueous solution and has a temperature increase of 13.26 °C? (Remember cwater = 4.180 J/°Cg)

asked by brittany sheats on November 17, 2013
27. ## Chemistry

Calculate the number of mile contained in a solution of sulphuric acid, if the title value on titration against 20cm3, 0.5M sodium carbonate is 20. 24cm3 0.02mol 0.01mol 0.04mol 0.15mol

asked by Sodiq on May 24, 2017
28. ## Chemistry

a .72g sample of polyvinyl chloride is dissolved in 250.0ml of a suitable solvent at 25C. the solution has an osmotic pressure of 1.67mmHg.What is the molar mass of the PVC?

asked by emerald on February 4, 2011
29. ## Trigonometry

Use a graph of the function to approximate the solution of the equation on the interval [−2π, 2π]. (List the solutions in increasing order from left to right on the x-axis. Round your answers to three decimal places.) cot x = −1

asked by V on January 31, 2016
30. ## Chem

1. If 36.23 mL of potassium permanganate solution is required to titrate 1.041 g of FAS (FeSO4(NH4)2SO4 * 6 H2O, molar mass = 342.0 g), calculate the molarity of KMnO4.

asked by Chris on March 10, 2008
31. ## Chemistry

Which of the following salts is NOT more soluble in acidic solution than in pure water? A. ZnS B. AgCN C. Ba3(PO4)2 D. ZnCO3 E. BiI3 The answer is E, but I don't know why or how I would go about answering a question like this. What would I have to consider

asked by Jonah on March 21, 2013
32. ## math correction

Directions: Perform the indicated divisions. The problem: (8x^3-6x^2+2x)/(4x+1) This is what i did and what i got: (4x^5)/(5x) = The answer that i got was: 0.80x^4 It is so wrong it hurts. How in the world did you get (8x^3-6x^2+2x) is equal to 4x^5 ?

asked by Jasmine20 on January 23, 2007
33. ## Science

How much mL of dilute nitric acid is needed to add in control solution in chloride limit test in sodium hydroxide sample according to japanese pharmacopia??can u please give me Answer

asked by Palakpatel on September 9, 2016
34. ## ENGLISH

hello...we have been reading THE SEVEN PER_CENT SOLUTION in my class...as an essay question we have to compare and contrastg the characters and professional methods of sherlock holmes and Sigmund Freud...tnx in advance!!

asked by Anonymous on September 10, 2007
35. ## Chemistry

why is a solution of copper sulfate and sulfuric acid required in corrosion testing? Won't the protons and the positive ions adhere to the metals surface and contaminant it?? Just a curious q. Thanks!

asked by Anonymous on January 10, 2017
36. ## chemistry

A student dissolves 0.550 mol of a nonvolatile, nonelectrolyte solute in one kilogram of benzene (C6H6). What is the boiling point elevation of the resulting solution? in degrees celsius

asked by Halle on June 1, 2010
37. ## Algebra

I never do this but I just don’t understand! Does anyone have the answers to the International Connections Academy Systems Of Equations And Inequalities Unit Test in algebra 1? The first question is Which graph represents the solution to the given

asked by Failing on January 18, 2019
38. ## Chemistry

Solutions are made that contain 0.1 moles of each of the following compounds below in 100g of H20. Choose the compound whose solution will have the lowest freezing point? NaBr CO2 KClO3 MgCl2 MgSO4

asked by Janet on January 13, 2013
39. ## chemistry

From a hydrogen peroxide (diluted in water) a sample of 1.00 g is removed, acidifing it with H2SO4 and then titrated with a solution of 0.20 M of KMnO4, requiring 17.6 mL of KMnOH. What is the percentage of H2O2 contained in the bottle?

asked by damon on July 8, 2019
40. ## AP CHEMISTRY

A dilute solution of which acid is most likely to produce a reduction product other than H2 when it reacts with a metal? A)HF B)HCL C)HNO3 D)H2SO4 Answer is C. I know it has something to do with it producing oxygen, but I really don't understand where that

asked by Ash on March 29, 2013
41. ## Chem

Determine the volume of 0.250M KOH solution required to neutralize each of the following samples of sulfuric acid. 200mL of 0.135M H2SO4. I have gotten both 0.027 and 0.675. I thought it was mol/L. Please help!

asked by JR on May 8, 2014
42. ## Vocabulary

No one would think of objecting to this practice, unless a(n)________ tip from an umbrella hit someone in the face. a. sticking-out b. sharp-pointed c. individual d. ever-present The solution is a synonym of "obtrusive." Is the answer a or b? I'm torn

asked by Anonymous on March 6, 2008
43. ## Chemistry

The formation constant* of [M(CN)4]2– is 7.70 × 1016, where M is a generic metal. A 0.150-mole quantity of M(NO3)2 is added to a liter of 0.870 M NaCN solution. What is the concentration of M2 ions at equilibrium?

asked by Meghan on April 5, 2016
44. ## science

if an acid has a pH of 1.1 what is the hydrogen ion concentration of the solution expressed in scientific notation to 3 significant figures, for my answer can it be written 1 x 10^-1.1 mol dm3? or can you not use decimals in the to the power of so should i

asked by annie on January 17, 2011
45. ## Differential Calculus

Given that p=(2q^2-5)^2. when q=3, it is increased by 0.7%. find the appropriate percentage in p. solution dp = 2(2q^2-5) (2dq) dp = (4x(18-5)(0.7%) dp = 4(13)(0.7%) am lost from here is dp=52x0.7/100= 0.364% Responses Differential Calculus - bobpursley,

asked by matrix school 2 on August 14, 2009
46. ## History

What was the goal of the minimum foundation program for education? A. It integrated whites and blacks int he same school system. B.It improved the quality of white-only education. C. It raised taxes. D. It put more money into black schools. @Writeacher

asked by Paul on March 24, 2015
47. ## Managerial Economics

Soft selling occurs when a buyer is skeptical of the quality or usefulness of a product or service. For example, suppose you’re trying to sell a company a new accounting system that will reduce costs by 10%. Instead of asking for a price, you offer to

asked by Jutee on May 20, 2015
48. ## PHYSICS!!

An amusement park ride consists of a rotating circular platform 8.26 m in diameter from which 10 kg seats are suspended at the end of 1.14 m massless chains. When the system rotates, the chains make an angle of 16.2 degrees with the vertical. The

asked by bubba on November 16, 2009
49. ## Physics

An amusement park ride consists of a rotating circular platform 8.26 m in diameter from which 10 kg seats are suspended at the end of 1.14 m massless chains. When the system rotates, the chains make an angle of 16.2 degrees with the vertical. The

asked by bubba on November 15, 2009
50. ## Physics

A motorboat traveling at a speed of 2.1 m/s shuts off its engines at t = 0. How far does it travel before coming to rest if it is noted that after 2.7 s its speed has dropped to half its original value? Assume that the drag force of the water is

asked by Anonymous on November 11, 2012
51. ## Chemistry

1. A student collected the following data for a fixed volume of gas: Temperature (⁰C) Pressure (mm of Hg) 10 726 20 750 40 800 70 880 100 960 150 ??? Fill in the missing data point. Show all calculations leading to an answer.

asked by sophia on December 28, 2016
52. ## Chemistry help please

A student collected the following data for a fixed volume of gas: ￼ Temperature(C) pressure(mm of hg) 10 726 20 750 40 800 70 880 100 960 150 ??? Fill in the missing data point. Show all calculations leading to an answer.

asked by Ciaria on March 12, 2015
53. ## History

What are some things in modern day America (especially our culture and media) that show that the Beatles really have affected/changed music? Three examples I have are: 1. Many artists have done covers of their songs. 2. There have been many references to

asked by Cassie on March 24, 2009
54. ## Chemistry

Given that the world's oceans comtain 1.35 x 10(to the 9th power)km³ of water, determine the mass in grams. Show how to obtain conversion factors from km³ to m³, report value in proper scientific notation using the correct number of significant figures.

asked by Yasmin on January 22, 2009
55. ## Grade 11 math

1.Transform the graph of f(x) = 3^x to sketch g(x) = 3^-(x+1) -2. Show table of values and each transformation clearly to get full marks. 2.Write two equations to represent the same exponential function with a y-intercept of 5 and an asymptote at y = 3.

asked by kdwk on March 13, 2012
56. ## Help on PreCalc

Hi Tutors, I've tried solving the problem below, but I keep getting it wrong. I've solved 3 similar questions thanks to Reiny and Steve, but this one, in particular, is giving me problems. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Use the given information to

asked by chizoba on August 15, 2016
57. ## trigonometry

i posted this question up before but it didn't show up. anyways.. i need help determining whether these two statements are true or not. i tried converting them into square roots but never got the right answer. like cos30=square root 3/2. here they are 1.

asked by y912f on January 7, 2009
58. ## ecology

explain how a sparrow is adapted for flying perching and eating seeds how is it different from an eagle Compare the feet and claws structures, the wing size/design and body weight ratios, and the beak structures. These will show great differences between

asked by chelcea on September 24, 2006
59. ## Science 8th grade

Please check my answer thanks A woman who recently came home from a tropical vaction now has abdominal pain and diarrhea// Her blod test show an elevated eosinophil level. Which of the following organisms is most likely the cause of her illness? A Bacteria

asked by Anonymous on March 25, 2008
60. ## language arts

2.which set of words best define the word remorse? the young child refused to show any remorse for his actions, even thought they had earned him a severe punishment. regret or shame envy or jealousy happiness or joy pride or arrogance ***

asked by lisa on May 5, 2016
61. ## Chemistry

A student collected the following data for a fixed volume of gas: ￼Temperature (C) Pressure (mm of hg) 10 726 20 750 40 800 70 880 100 960 150 ??? Fill in the missing data point. Show all calculations leading to an answer.

asked by Maria on July 13, 2015
62. ## math

At the half time show, a marching band marched in formation. The lead drummer started at a point with coordinates (-2,-5) and moved 3 steps up and 1 step right. a: write a rule to describe a translation b: what were the coordinates of the drummers final

asked by victoria on November 12, 2013
63. ## English

are they assertive,non assertive, or aggressive? You never return my phone calls. I am not sure when I can meet. I'm pretty busy. If we take the two o'clock train, we can get to the theater in time to have dinner before the show. The last designer I worked

asked by S.A.M on January 18, 2015
64. ## English

Hello. I'll be grateful for some more help. Is it possible to use the Perfect tense twice in the sentence, for example "Peter, who has long lived in New York, has promised to show me the city"? Thank you very much for help. As for the sentence about

asked by Ilma on May 13, 2012
65. ## physics

1. You slowly lift a book of mass 2 kg at a constant velocity a distance of 3 m. How much work did you do on the book? I got 180 for this 2. A 15 kg crate is moved along a horizontal floor with a rope that makes a 30 degree angle with the horizontal. If

asked by Mei Lei on August 19, 2011
66. ## writing

i don't understand what u said, writeteacher. can you show me? Can u proofread and show me how to fix me my writing? Philip Malloy Have you ever watched the movie? In the story, “Nothing but the truth,” by Avi, a boy named Philip Malloy had many traits

asked by hope on May 17, 2011
67. ## Math - 3rd grade

Mr. Thomas travel 20miles each week to and from work. If he works 5 days a week, how many miles does Mr. Thomas travel each day to go to work? Does this mean 20miles total for the week or that it should be 40miles total(20 miles to + 20 miles from)?

asked by Jared on October 27, 2015
68. ## Ready to submit my essay

Illustration Essay: Successful Student The value of education has really degraded in the past years; some say that college is difficult to cope with because of the stressful lifestyles, and some do not even bother trying. The truth is that college is not

asked by HM on September 28, 2011
69. ## TRIG

Verify the following identity. 1) sin(x+y) __________ = tanx+tany cosxcosy 2) Write cos3x in terms of cosx I cannot figure out how to solve for identities they are so hard. Any help appreciated!:)

asked by ALISON on October 23, 2011
70. ## physics

An electron and a proton are each placed at rest in an external uniform electric field of magnitude 520 N/C. Calculate the speed of each particle after 48 ns. None of the equations I have seem to help me. What can I use to solve this problem? I figured it

asked by Mischa on April 12, 2007
71. ## Simplifying Rational Expressions

Can someone PLEASE solve these for me 1.4x-12/4x 2.d+7/d^2-49 3.t^2-25/t^2+t-20 4.2x^2+6x+4/4x^2-12x-16 5.6-y/y^2-2y-24 You need to use parentheses to clarify the menaing of those expressions. For example, if you mean (4x-12)/4x instead of 4x - (12/4x),

asked by mike on May 16, 2007
72. ## math

I believe Lance meant to write x = -5/18 I am wondering why you have two minus signs before the number 13. Two minuses make a plus, but usually they are not written that way. combine like terms -18x=5 solve for x x=5/18 what does x equal in...

asked by drwls on January 17, 2007
73. ## Discrete Math

Solve the recurrence relation a_n = -6a_n - 1 + 7a_n-2, n ≥ 2, given a₀ = 32, a₁ = -17. This is what I have figured out so far: polynomial: x² + 6x - 7 distinct roots: 1 and -7 I do not understand how to find C₁ and C₂. How do I complete this

asked by Francesca on April 5, 2011
74. ## Trig-Medians and law of cosines and sines

In triangle ABC, we have AB=3 and AC=4. Side BC and the median from A to BC have the same length. What is BC? Not making sense to me, I think the answer must be simple, but I don't know how to solve I applied the law of sines but to no avail. Help is

asked by Sam on November 20, 2013
75. ## physics

umm i need help...which equation would i use to solve the probnlem and how do i go about finding the answer? Here it is: Sam tosses a ball horizontally off a footbridge at 3.1 m/s. How much time passes after he releases it until its speed doubles?

asked by tj on December 20, 2010
76. ## microeconomics

Hi, I have to answer the following question: A person with the utility function U(x, y) = y + x^2 has convex preferences, true or false? I don't know how to do it, do I put U(x,y) = to a K and make up some bundles? Can someone please explains the step to

asked by alsac on October 18, 2015
77. ## Algebra-Did I even begin correctly?

How would I write log(6)27-2log(6)3 as a single logarithm Would I start by getting rid of the (-2)- I know its the same log6 but what would I do with the 27 and the 3 I'm really confused on this one and I have to solve several similar ones with no clue on

asked by Matt on December 13, 2010
78. ## Chemistry 1151

i have been trying for a few hours now to solve this, but i missed tis day in class and my mind wont wrap around the concept. can someoneplease help?? How many moles of Neon are in a 25mL container at STP?

asked by Sydney on October 6, 2010
79. ## Chemistry

Calculate the volume of ovygen at STP collected at 25.0 L at 775 mm and 296 Kelvins. Yhe mercury level inside the tube is 28.0 mm higher than outside. Please help me solve, I am at a loss :(

asked by Gaby on April 9, 2012
80. ## ALGEBRA

Determine the comparable interest rate for a \$70,000 loan when the quoted information is 10.2% + 0.5 pt + \$200. (Round your answer to two decimal places.) Just need the steps to solve this problem.

asked by MONICA on November 26, 2011
81. ## advance functions gr 12

2 QUICK QUESTIONS PLEASE HELP ME I NEED THEM FOR THE MORNING! the ______________ (fill in blank) of logarithms state that log (xy)= logx + logy solve the equation 6^3x+1= 2^2x-3, Leave in extact form THANKS

asked by samantha on June 10, 2013
82. ## Chemistry

K1 = 0.727 K2 = 12.1 T1 = 2000 T2 = 3000 Solve for the standard enthalpy of formation. They gave me the formula ln(K2/K1) = DeltaH /R (T2 - T1 / T1T2) The answer is supposed to be in KJ/mol and I keep getting 2.022 but its not right. I'm not sure what Im

asked by Katie on March 24, 2013
83. ## physics

Solve the equations 1 2 mv2 + 1 2 Iω2 = mgh and v = rω for the speed v using substitution, given that I = mr2 and h = 4.20 m. (Note that mass m and radius r will both cancel, so their numerical values aren't required.)

asked by alba on March 6, 2015
84. ## Social Studies

Which of the following is most likely to help countries in West and Central Africa solve their economic problems? A. griots B. microcredit C. imports of natural resources D. negative balance of trade I think the answer is D.

asked by Molly on September 23, 2015
85. ## algebra

I don't quiet know where to start can anyone help guide me? Bonnie has a container in the shape of rectangular pyramid. The formula for the surface area of the enclosed space is S=lw+0.5Ph. Solve for P? P= S - lw- 0.5h P= S + lw + 0.5h P= S-lw/ 0.5h P=

asked by kat on October 5, 2015
86. ## math

please guys help me this question, how to solve it. Calculate the total surface area of a hollow cylinder whose radius is 15 cm and height is 20 cm. (a)3297 cm^2 (b)1884 cm^2 (c) 3768 cm^2 State why you choose a,b or c?

asked by kelvin on August 16, 2018
87. ## math

a block of wood in the shape of a cubiod has lenght 2.5meter and breadth 1.5 meter and heightt 2 miter how many cubical blocks each of edge 50 cm can be cut from it plz solve

asked by pawan on November 13, 2017
88. ## trig

I am currently taking a trig class. I need help understanding how to solve for sin,cos, and tan in problems which give an angle and a side length or the hypotenus. Any help would be muchly appreciated

asked by Ben on February 11, 2015
89. ## Social Studies

Please check this one. Thank you! Which of the following was an outcome of reforms put in place to solve the problems caused by industrialization? A.vertical integration** B.trusts C.public education D.cottage industries

asked by Mama on October 30, 2018
90. ## Biology (URGENT PLEASE!)

This is a question of my last biology test: Name at least one technological device that would have not been invented without scientific knowledge: A.Radio B.Ruler C.Knife D.None of the above I answered D but got a cross for it. So can you please help me to

asked by Elizabeth on November 24, 2010
91. ## CHEMISTRY

P + 5C2H5OH + 5/2 I2 ---> 5C2H5I + H3PO4 + H2O m(P)=4.14g m(C2H5OH)= 27.5g m(I2)=63.5g m(C2H5I)= 73g Whats the percent yield of the reaction? (Can someone more precisely explain how to solve the problem please)

asked by Anonymous on February 8, 2013
92. ## Urgent geometry help

On my test over parallel lines and proportional parts in triangles today, there was a question that asked to solve for x. There was 2 problems with x in them in the triangle. So would I just have to multiply each part by two and set them equal to each

asked by Anonymous on December 15, 2014
93. ## Thermochemistry

What volume of benzene (C6H6, d= 0.88g/ml, molar mass= 78.11g/mol) is required to produce 1.5x10^3 kJ of heat according to the following reaction? I just can't figure out what equation to use to solve this. Help, please?

asked by Anon on October 17, 2016
94. ## Math,algebra

Can someone explain to me how to solve the following. Directions:Multiply and write the answer in simplest form. 4/10 divided by 10/4? 4/10 / 10/4 change to mulitpcation by flipping the last fraction: 4/10 * 4/10 = 8/20 8/20 = 4/10 = 2/5 luke, I'm sorry i

asked by jasmine20 on December 16, 2006
95. ## chemistry

What is a problem-solving technique that uses equivalent measurements in ratio form to solve problems? A. Avogadro's number B. Conversion C. Dimensional analysis D. The mole concept A

asked by Drew on November 10, 2012
96. ## Algebra

In chemistry, n molecules of an ideal gas have pressure (P), volume (V), and temperature (T) that stand in the following relation, where R is a constant. PV = nRT If you solve for n what would be a good equation? I came up with n=PV/RT Some other choices

asked by mary on April 26, 2011
97. ## Math

Find the coordinates of the point at 180 degrees on a circle of radius 3.4 centered at the origin. Round your answers to three decimal places, if required. ( , 0 ) I got 0 as the y coordinate. Please help me solve for x

asked by Thomas on October 24, 2014
98. ## child psychology

The ability to solve abstact problems such as those found in algebra and higher mathematics is influenced by devdlopment and A. genetics B. societal factors C. health D. cognitive style

asked by Anonymous on August 25, 2010
99. ## Math

A cup of coffee costs 80c less than a burger.Together they cost 220c. Use this information to form an equation and solve it. This question I can't get my head around. It's due in 2 days but I would like to get it done sooner. Thanks.

asked by Zoe on January 9, 2013
100. ## Math

At 1 pm two trains, traveling toward each other leave from towns that are 312 km apart. One train averages at most 82km/h and the other at most 74km/h. What is the earliest possible time for them to meet? Please help me solve this. I'm not exactly sure how

asked by Liana on September 23, 2010