Monday

October 20, 2014

October 20, 2014

Number of results: 25,680

**Chemistry**

How would each of the following affect the accuracy of the calculated neutralizing power of antacid (too high, too low, or no effect) a. The titration flask was wet with distilled water when the antacid was added. b. The buret was not rinsed with NaOH solution before titrating...
*March 24, 2012 by Darrylnn*

**chemistry asap!**

I'm having trouble solving this percentage concentration problem: A student wants to make 5.00% solution of rubidium chloride using 0.377g of the substance. What mass of water will be needed to make the solution? [g RbCl2/(g RbCl2 + g H2O)]x100 = 5.00 Solve for g H2O. A day ...
*January 24, 2007 by michelle*

**college algebra**

1. find the equation of the line with the given properties. Express the equation in general form or slope-intercept form. perpendicular to the line -3x_y= -27; contains the point (9, -1) the equation of the line is ? 2. solve the polynomial inequality and then graph the ...
*December 1, 2012 by confused--two questions please help*

**Chemistry/Env Sci**

a)the E0 for the reactions 2HOCl + 2H+ + 2e- → Cl2 + 2H20 and Cl2 + 2e- → Cl- are 1.63 and 1.396 volts respectively. Write the half reaction of HOCl being reduced to Cl- and develop the full pE/pH equation for this reaction. b)What is the pE of a HOCl/Cl- solution ...
*July 31, 2013 by Dave*

**chemistry**

An ideal solution of 5.00 mole benzene and 3.25 mole toluene. At 298 K, the vapor pressure of the pure benzene and toluene were 96. Torr, and 28.9 Torr, respectively. At what pressure does the vapor phase appear first, if the pressure above this solution is reduced from 760 ...
*May 12, 2014 by Anonymous*

**college stats**

Again sorry for all the questions. please help, I am not good at stats and find these questions very difficult. I would appreciate an explanation if possible. 1.What is the sample average? 2.What is the SD of the box? 3.What is the number of draws from the box (the sample size...
*July 12, 2013 by penelope*

**Statistics PLEASE HELP**

1. In a recent election Smith ran against Jones for Governor. A pre-election poll surveyed 1885 randomly selected voters. Of those surveyed 980 indicated that they planned to vote for Smith. The five questions below pertain to the problem of testing the hypothesis that a ...
*April 11, 2009 by Winky*

**Sta**

It is pretty common across most schools to find the grades at the MBA level divided between A’s and B’s. As such, you expect the mean GPA to be around 3.50. Using the sample of 200 MBA students, conduct a one-sample hypothesis test to determine if the mean graduate GPA is ...
*March 17, 2012 by Mark*

**math, help**

can someone show me how to do this one i have plenty of them so can you show me step by step when someone gets a chance. Thank you. Solve the system by graphing x+y=3 x+y=-1 What I would do is to put the equations in slope intercept form: y= -x + 3 y= -x -1 Then graph the ...
*February 10, 2007 by jasmine20*

**statistics**

The value of the z-score that is obtained for a hypothesis test is influenced by several factors. Some factors influence the size of the numerator of the z-score and other factors influence the size of the standard error in the denominator. For each of the following indicate ...
*February 29, 2008 by Tyler*

**Statistics**

For this assignment you are to imagine that you are part of a select marketing group. This select group has been asked to consider the Colorado City Convention and Visitors Bureau survey of 25 hotels in the local area. The survey is concerned with the current availability of ...
*May 5, 2012 by Angela*

**math**

Pick a country of your choice that is experiencing population growth. Using the Library, web resources, and/or other materials to find the most recent population count of the country you have chosen and the population growth rate of that country. Use that growth rate to ...
*September 17, 2008 by Anonymous*

**CHEMISTRY**

1.Chemistry Question: A 0.1 M solution of acetic acid is titrated with 0.05M solution of NaOH. What is the pH when 60% of the acid has been neutralized? The equilibrium constant (Ka) for acetic acid is 1.8x10^-5 2. Chemistry question: On average, how far is a molecule of air ...
*August 21, 2010 by Gerald*

**Bio (please help me, important)**

In my bio lab we are creating serial disk dilutions (100mg, 300mg, 500mg) from a plant extraction sample. Wood sample #1 (7mL of hexane) Hexane 0.6651g so .6651g of the plant was dissolved in 7mL of hexane. Then I did dilution calculations so 0.6551g/7 mL = 0.095g/ml so I ...
*January 3, 2007 by Ali*

**Chemistry**

I need to find out what the total acid concentration is in Kool-Aid. If 23.3 mL of 0.1043M NaOH neutralize a 60 mL solution of Kool-Aid (10 mL) and water (50 mL), what is the total concentration in a 10.00 mL aliquot of Kool-Aid? If you prepared a standard 250 mL serving by ...
*February 15, 2011 by Julie*

**Chemistry**

In the laboratory exercise "Preperation and Properties of Polymers", polyvinyl alcohol is dissolved in water and then reacted with borax (Na2B4O7·10H2O) in water. Which of the following are expected results of this reaction? True or False? 1. Polyvinyl alcohol became graft ...
*April 22, 2011 by Chem*

**Algebra**

f(x)=x/(x+2) and g(x)=4x-2 (A.) Find f of g(1). Is the solution "1/2" correct? (B.) Find g of f of f(2). Is the solution "-6/5" correct?
*November 28, 2009 by C.*

**Inter. Algebra**

Another problem plz help Count Iblis. How do you solve 5/x+2 + 2x/x squared - 4= 3/x-2? 5/x+2 + 2x/x squared - 4= 3/x-2 You write the term: 2x/x squared as 2/x the equation becomes: 5/x+2 + 2/x - 4= 3/x-2 4/x = 0 This equation has no solutions. It is only satisfied in the ...
*December 2, 2006 by Andrea*

**math**

A sample of 148 of our statistics students rated their level of admiration for Hillary Rodham Clinton on a scale of 1 to 7. The mean rating was 4.06, and the standard deviation was 1.70. (For this exercise, treat this sample as the entire population of interest.) a. Use these ...
*October 12, 2013 by eid2013*

**math **

A sample of 148 of our statistics students rated their level of admiration for Hillary Rodham Clinton on a scale of 1 to 7. The mean rating was 4.06, and the standard deviation was 1.70. (For this exercise, treat this sample as the entire population of interest.) a. Use these ...
*October 14, 2013 by eid2013*

**chemistry**

As you saw in Part B, the vapor above the cyclohexane-acetone solution is composed of both cyclohexane vapor and acetone vapor. What mole fraction of the vapor above the solution, X(cy) vapor), is cyclohexane?
*February 8, 2011 by me*

**Statistics**

1. Suppose the distribution of birth weights of babies born at Big General Hospital is normal. If the mean weight is 7.5 lb. and the standard deviation is 1.25 lb, about 50% of the babies will weight between.... 2. Joe runs a carnival game in which he charges $2 for a player ...
*April 26, 2012 by Linda*

**Chemistry**

Use Henry's law and the solubilities given below to calculate the total volume of nitrogen and oxygen gas that should bubble out of 1.6 L of water upon warming from 25 C to 50 C. Assume that the water is initially saturated with nitrogen and oxygen gas at 25 C and a total ...
*September 17, 2009 by RE*

**chemistry**

1. Calculate the volume of carbon dioxide at 273 K and 1.01 * 10^5 Pa which would be produced when 1.25g of calcium carbonate reacts completely with HCL. and 2. When 41.18 cm^3 of a solution of silver ions with concentration of .2040 mol dm^-3 is added to a solution of XO4 -3 ...
*May 19, 2008 by ANn*

**chemistry**

Concentrated hydrochloric acid is a 38% solution of hcl in water and has a density of 1.18g/ml. How many milliliters of concentrated hydrochloric acid are needed to prepare 500ml of a 1:200 hcl solution? My calculation 500ml x 1:200 =2.5 1:200 means 1gm/200ml 2.5 x 36.5 = 91....
*August 9, 2012 by Fai*

**chemistry**

a student mixes 4 reagents together thinking that the solution will neutralize each other . The solution is mixed together are 50 ml of 0.100 M of HCL and 100 ml of 0,200 M of nitric acid 500 ml of 0.0100 M ca hydroxide and 200 ml of 0.100 M rubidium hydroxide . Did the acid ...
*September 27, 2014 by mathew*

**Solving Two-Step Equations for Reiny or Steve~!**

1) Which of the following is a solution to the equation y=3x-1? (4,1)*** (2,5) (4,3) (0,-3) 2) Which equation represents the pattern in the table below? (Sals and Carrie’s Ages) Sal 3 5 8 13 15 Carrie 7 9 12 17 19 S=c+4*** S=4c C=s+4 C+4s 3) Solve. 1/3x=12 X=4 ...
*September 23, 2013 by Gabby*

**Chemistry**

In concentrated aqueous solutions of NaCl, the Na+ (aq) ions can be so close to the Cl- (aq) ions that a small percentage is associated in ion pairs at any given moment. Suppose that a solution contains 1.00 mol of NaCl and that 5.57% of the formula units exist in solution as ...
*May 2, 2007 by Mike*

**chemistry**

Caclulate the Ka of nitrous acid if a 0.200 mol/L solution at equilibrium at SATP has a percent ionization of 5.8% ka=(H+)(NO2-)/(HNO2-) If 1.59% ionized then after ionization H+ = 0.2 x 0.058 =? NO2- = 0.2 X 0.058=? HNO2=0.2 x (1.0 - 0.058) If solution is 5.8% ionized, than ...
*April 7, 2008 by Dustin*

**Algebra Help PLEASE**

King’s Service Station uses two kinds of cleaning solution containing acid and water. “Attack” is 2% acid and “Blast” is 6% acid. They want to mix the two to get 60qt of a solution that is 5% acid. How many quarts of each should they use. Let a = number of quarts of "Attack" ...
*May 8, 2008 by Kell*

**Chemistry**

A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 235 torr. Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature. What is the mole fraction composition of the mixture?
*February 11, 2013 by Emma*

**math**

Determine all the possible values of x where 0 deg is more than or equal to x and x is more or equal to 360 deg such that i'm not sure the solution, please correct it and how to find the x value, 2 tan x - 1 = cot x solution: (sec x -1)(sec x + 2) = 0 sec -1 = 0 , sec x + 2 = ...
*April 15, 2013 by choi2463*

**algebra**

Can someone PLEASE explain how to do this to me? Thank you so much! Ten gallons of a 30% acid mixture is obtained by mixing a 50% solution (X) with 20% solution (Y). Write an equation for the 10 gallon mixture. What is the acid concentration, in gallons, of the final mixture? ...
*October 28, 2010 by Holly*

**chemistry**

A solution contains 10.05 grams of an unknown covalent substance in 50.0 grams of water. The freezing point of this solution is (-) 3.16o C. What is the formula weight of the unknown compound? Below is what I tried, but don't know what to do next. Please explain step-by-step. ...
*October 11, 2013 by Anonymous*

**chemistry**

A 25 mL solution of nitric acid was placed in a flask and a few drops of phenolphthalein were added. Dilute sodium hydroxide was added util the indicator changed colour. It was found that 28 mL of the alkali was used. (a) What colour was the solution in the flask at the start ...
*August 7, 2014 by Shane*

**MATH 116**

• How do you know when an equation with one variable has infinitely many solutions? • How do you know when an equation with one variable has no solution? • How do you know when an equation with one variable has one solution? • Give an example of each type of equation?
*September 13, 2010 by TONY*

**chemistry**

what are the hydronium-ion and the hydroxide ion concentration of a solution at 25 C that is 0.0050 M strontium hydroxide, Sr(OH)2? a solution of hydrochloric acid is 0.20 M HCl. What is the hydronium-ion at 25 C? What is the hydroxide ion concentration at 25 C?
*August 6, 2011 by Henry*

**Chemistry**

A solution contains naphthalene (C10H8) dissolved in hexane (C6H14) at a concentration of 15.00% naphthalene by mass. Calculate the vapor pressure at 25 ∘C of hexane above the solution. The vapor pressure of pure hexane at 25 ∘C is 151 torr. I keep getting 168 torr...
*September 20, 2014 by Kaitlyn*

**chemistry**

NH4NO3(s) NH4+(aq) + NO3−(aq) In order to measure the enthalpy change for this reaction above, 1.07 g of NH4NO3 is dissolved in enough water to make 25.0 mL of solution. The initial temperature is 25.8°C and the final temperature (after the solid dissolves) is 22.4°C. ...
*November 16, 2012 by DeeDee*

**Calculus**

Using 3(x-3)(x^2-6x+23)^1/2, as the chain rule differentiation of f(x)=(x^2-6x+23). Please explain how I find the general solution to the differential equation dy/dx= 2/27(x-3)SQUARE ROOT BEGINS (x^2-6x+23)/y SQUARE ROOT ENDS (y>0). In implicit form I have an answer of 18*y...
*May 12, 2011 by Tony*

**Chemistry - Solution Stoichiometry**

A piece of nickel is placed in a beaker with 350 mL of copper (II) sulfate. Calculate the concentration of the copper (II) sulfate solution. Initial mass of nickel - 15.5 g Final mass of nickel - 11.4 g What do i do with the final and initial masses of nickel?
*April 2, 2008 by Michelle*

**Chemistry**

Determine the pH of the following solutions: a) A 250.0 mL solution that contains 0.125 M benzoic acid and 0.147 M sodium benzoate. b) The solution in part (a) after 30.0 mL of 0.510 M hydrochloric acid has been added. a. Ka = 6.3 x 10^-5 pKa = 4.20 pH = pKa+log(base/acid) pH...
*July 15, 2014 by Arthur T*

**Statistics**

(25 pts, 5 pts each) The ounces of coffee that a machine dispenses in 5-ounce cups have normally distributed. Suppose a sample of size 6 was taken from this machine, as shown as follows: 5.05 5.03 5.10 5.02 4.98 5.00 (for all calculations, keep at least six decimal places) (1...
*May 9, 2014 by Trell *

**algebra II**

How do you know if a quadratic equation will have one, two, or no solutions? How do you find a quadratic equation if you are only given the solution? Is it possible to have different quadratic equations with the same solution? Explain. Provide your classmate’s with one or two ...
*October 7, 2008 by Nadia*

**algebra II**

How do you know if a quadratic equation will have one, two, or no solutions? How do you find a quadratic equation if you are only given the solution? Is it possible to have different quadratic equations with the same solution? Explain. Provide your classmate’s with one or two ...
*June 15, 2010 by hollywood*

**FlunkyJunkie**

Calculate the volume (mL) of the solute (CH3)2CO and the volume (L) of the solvent H2O that should be added to prepare 1.36 kg of a solution that is 25.7 g (CH3)2CO per 100. g solution. Molar Mass (g/mol) (CH3)2CO 58.05 H2O 18.015 Density (g/mL): (CH3)2CO 0.7899 H2O 0.9982 ...
*February 14, 2010 by Jackie*

**chemistry**

Calculate the volume (mL) of the solute (CH3)2CO and the volume (L) of the solvent H2O that should be added to prepare 1.36 kg of a solution that is 25.7 g (CH3)2CO per 100. g solution. Molar Mass (g/mol) (CH3)2CO 58.05 H2O 18.015 Density (g/mL): (CH3)2CO 0.7899 H2O 0.9982 ...
*February 14, 2010 by Jackie*

**Chemistry**

A 1.250 g mass of standard aspirin is dissolved in approximately 20 mL of 1 M NaOH. This solution is added to a 250-mL volumetric flask and diluted to the mark with DI water. How many grams per mL of aspirin are in the resulting solution? (Note that a 250-mL volumetric flask ...
*January 26, 2014 by Anonymous *

**Biology**

Describe how a sample of whole chloroplasts could be obtained from leaf tissue please could someone point me in the right direction
*September 27, 2007 by Sam*

**chem-calorimetry**

what approach do you suggest using to prevent your water sample from cooling off beore you start your measurements?
*March 31, 2008 by natash*

**Organic Chemistry**

A sample of isoborneol prepared by reduction of camphor was analyzed by IR and showed a band at 1750 cm-1. This result was unexpected. Why?
*July 21, 2008 by Caleb*

**Stat**

the teacher wants me to make a survey questions about a sample and get a statistical data from it, how? including variance and standard deveriation. thanks
*December 30, 2008 by Omar*

**chemistry**

a 50.0 ml sample of water is heated to its boiling point. how much heat (in KJ) is required to vaporize it? (assume a density of 1.00g/ml).
*February 7, 2009 by reese*

**english**

I really dont have a question, but can you give me an example or sample of an outline of a historical person for a research paper.
*March 20, 2009 by beth*

**chemistry**

A 2.00g sample of SX6(g) has a volume of 329.5mL at 1.00 atm and 20celsius. Identify element X. Name the compound.
*June 18, 2009 by Juggernaut*

**critical thinking**

Select a topic of interest and explain how you would come up with a reliable sample for obtaining peoples’ opinions.
*November 21, 2009 by angel*

**Prob and Stats**

In a multiple regression with 5 predictors in a sample of 56 U.S. cities, what would be the critical value for an F test of overall significance at a= .05? A. 2.45 B. 2.37 C. 2.40 D. 2.56
*December 9, 2009 by please help!*

**CP Science 9th grade**

A Sample of Air at 35 degrees Celsius has a relative humidity of 15%. How do you find the dew point temperature?
*January 26, 2010 by Emily*

**Physics**

Calculate the specific heat of a metallic element if 314 joules of energy are needed to raise a 50.0 g sample from 25 to 50 degress C ? :)
*March 21, 2010 by Christina*

**biology**

How many Calories are found in a food sample if burned in a calorimeter is raises the temperature of 1000 grams of water 58 degrees?
*April 27, 2010 by Anonymous*

**chemistry**

calculate the number of protons, neutrons, and electrons in the sample of scandium that you weighed at 7.9 mass weight if it is 100% ^45Sc.
*May 11, 2010 by GKMB*

**chemistry**

A 450 ml gas sample STP is compressed to 200 ml and the temp. Increased to 42 degrees celcuis. What is the new pressure.
*May 17, 2010 by theo greene*

**statistics**

In a goodness-of-fit test where the sample size is 200, there are 5 categories, and the significanace level is .05. What is the critical value of x squared?
*June 7, 2010 by Amy*

**STATISTICS**

If my p-value = .322 and my significant level is .05 , then; I cannot make a decision until my sample size is given. is the correct answer?
*June 10, 2010 by John*

**chemistry**

a 10.0-ml sample of aqueous HCL requires 24.32ml of 0.134M NaOH to reach the endpoint, what is the molar concentration of H2SO4
*July 3, 2010 by weet*

**chem**

If this sample of dry ice were to be placed in an evacuated 1.0 L container and allowed to come to room temperature (25 oC), what would the pressure be?
*September 6, 2010 by dan*

**Organic Chemistry**

What is the smallest volume (in milliliters) of boiling water the student could use to dissolve the 3.88 g sample of phthalic acid?
*September 8, 2010 by Anonymous*

**chem**

as kelvin temperature increases, the average kinetic energy of the particles in a sample 1.Increase 2.Decrease 3.Remains the same
*September 14, 2010 by chris k*

**college chemistry**

How many total moles of ions are released when the following sample dissolves completely in water: 5.15x10^-3 g Ca(NO3)2
*September 26, 2010 by KELLY*

**chemistry**

A water sample contains 102mg of CaSO4 per litre. Calculate the hardness in terms of CaCO3 equivalent.
*January 20, 2011 by Anonymous*

**Chemistry**

A sample if liquid water (30g)heats up from an initial temperature of 20C to 78C. How much energy did it take in?
*March 30, 2011 by Jasmine*

**Chemistry**

A sample of iron with a mass of 75.66g and an initial temperature of 15.38C gains 10480 Joules. What is the final temperture?
*April 6, 2011 by Lewis*

**writing**

What does the (n.d.) stand for in the following sample citation: GovTrack. (n.d.). Brian Higgins U.S. Representative, New York’s 27th District
*April 24, 2011 by Anonymous*

**chemistry**

how much energy is released when a 5600 gram sample of water cools from 99 degress celsius to 28 degrees celcius
*May 10, 2011 by m*

**Science/Chemistry**

22Na has a half-life of 951 days. How many grams of a 1.00 kg sample would be left after 4 years?
*May 16, 2011 by Samantha*

**chemistry**

determine half life of krypton-92 if only 6.0 millograms of an original 96.0 sample remains unchanged after 7.36 seconds
*June 8, 2011 by Deb*

**science: chemistry **

Which equation is set up correctly to determine the volume of a 1.5 mole sample of oxygen gas at 22°C and 100 kPa?
*July 14, 2011 by jane doe *

**science: chemistry **

Which equation is set up correctly to determine the volume of a 1.5 mole sample of oxygen gas at 22°C and 100 kPa?
*July 14, 2011 by jane doe *

**Written Analysis**

Analyze my own experience with faulty thinking, in a minimum of three well developed sentences. Sample please.
*October 1, 2011 by keri*

**chemistry**

could the quantitative precipitation be useful to determine the mass percent of copper in a sample that also contains magnesium ions?
*October 10, 2011 by ana*

**Math**

Calculate the minimum sample size required to find the 90% interval estimate for a population proportion if you want to be accurate within 2%.
*November 11, 2011 by King*

**chemistry**

A sample of neon gas at 1.20 atm compresses from 0.250 L to 0.125 L. If the temperature remains constant, what is the final pressure?
*November 14, 2011 by Mallory*

**Chemistry**

A 1.2 g sample of C-5 H-10 O is burned completely in excess oxygen to yield CO2(g) and H2O(l) at 25 C, releasing 43.52 kJ of energy. What is the enthalpy of formation of C-5 H-10 O?
*December 2, 2011 by LaurenB*

**chemistry**

A sample of cesium metal reacted completely with water, evolving 47.0 mL of dry H2 at 31°C and 769 mmHg. What is the equation for the reaction?
*December 13, 2011 by Jessica*

**Chemistry**

How many atoms are present in a sample of 2.0 x 10^23 molecules of C7H5(NO2)3? Do you use Avogadro's Number? And please show work.. :)
*January 6, 2012 by Sunny*

**Chem**

What weight of sample containing 8.00 % Fe3O4 must be taken to obtain a precipitate of Fe(OH)3 that, when ignited to Fe2O3, weighs 150 mg?
*January 16, 2012 by Yuki*

**statistics**

A population is normally distributed with a man of 100 and a standard deviation of 15. is it unusual for themean of a sample of 3 to be 115 or more? Why or why not?
*January 30, 2012 by Donna*

**statistics**

Assume that a sample is used to estimate a population proportion p. Find the margin of error. 95% confidence; n = 250, x = 130
*March 27, 2012 by Chris*

**Physical Science**

How much heat is needed to melt a sample of ice if the temperature of 150 g of water in the calorimeter is lowered from 23.0 C to 0 C?
*April 3, 2012 by Malise*

**Stats**

What is the minimal sample size needed for a 99% confidence interval to have a maximal margin of error of 0.06 if there is no preliminary estimate for p?
*July 8, 2012 by Lynn*

**chemistry**

2.85 sample of an unknown chlorofluorocarbon is decomposed and produces 558 of chlorine gas at a pressure of 756 and a temperature of 298 .
*July 22, 2012 by des*

**Chemistry**

A 1.5 gram sample of a gaseous hydrocarbon has a volume of 820 mL when measured at 227 oC and 2.50 atm. Which of the following is the formula for the gas?
*September 21, 2012 by Helen*

**Chemistry**

To what temperature must a gas sample initally at 13 degrees be raised in order for the avarage energy of its molecules to double?
*October 12, 2012 by Anonymous*

**chemistry**

what fraction of an original sample of a radioactive isotope remains after three half-lives have passed? 1/8?
*October 13, 2012 by jake*

**Organic Chemistry**

Thin Layer chromatography TLC experiment What does it mean when it says with to much sample the spots will tail
*October 26, 2012 by Nathalie*

**chemistry**

how many grams of CO2 can be formed by the complete combustion of a 14.7 sample of C2H6 that is 92.4% pure?( assume the impurities contain no carbon)
*February 22, 2013 by rose*

**Chemistry **

A sample of gas weighs 2.832g and has a volume of 1010.0 ML at 775.0 torr and 31.0 degrees Celsius what is its molar mass?
*March 11, 2013 by Anonymous*

**math**

A sample of size 100 is taken resulting in a standard deviation of 3. Construct a 95% confidence interval for the population variance.
*May 8, 2013 by Jewelz*

**Business Statistics**

You wish to learn the proportion of MBA students that are female within 3%, and with 98% confidence. How large of a sample should you get?
*July 11, 2013 by Tesa*

**chemistry **

Q2: A sample of carbon dioxide(CO2) has a mass of 55g and occupies 3.3L at 100C. What pressure does the gas exert (in kPa)?
*December 8, 2013 by b*

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