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December 22, 2014

Search: 355g sample of a saturated solution of KNO3

Number of results: 26,360

Math - Alg
How much pure acid must be added to a 30% acid solution to make a 60L solution which is 50% acid? This was the answer I got from Reiny. amount of pure acid to be added -- x L 1(x) + .3(60-x) = .5(60) 10x + 3(60-x) = 5(60) 10x + 180 - 3x = 300 7x = 120 x = 120/7 or appr 17.14 L...
February 8, 2014 by Brittany Jones

Chemistry - DrBob222 please check and help
Can you check these? And I need help on one. Oxidation Number Method of Balancing Redox Reactions 1)Neutral Solution Sn^2+ + Fe^3+ ----> Fe^2+ + Sn^4+ Balanced equation Sn^2+ + 2Fe^3+ ----> 2Fe^2+ + Sn^4+ 2)Acidic Solution Fe^2+ + Cr2O7^2- ---> Cr^3+ + Fe^3+ Balanced ...
February 21, 2008 by Alex

Chemistry - DrBob222 please check and help
Can you check these? And I need help on one. Oxidation Number Method of Balancing Redox Reactions 1)Neutral Solution Sn^2+ + Fe^3+ ----> Fe^2+ + Sn^4+ Balanced equation Sn^2+ + 2Fe^3+ ----> 2Fe^2+ + Sn^4+ 2)Acidic Solution Fe^2+ + Cr2O7^2- ---> Cr^3+ + Fe^3+ Balanced ...
February 21, 2008 by Alex

marketing
Envision that you run a highly successful tattoo and piercing parlor in a small West Coast city. You are fairly certain that between you and your key competitor, you have saturated your target audience of people in their teens and 20s. To grow your business, you need to reach ...
July 12, 2011 by David

Chemistry
You carry out an exothermic reaction inside a Styrofoam cup calorimeter, using a temperature probe to monitor the temperature throughout the reaction. You find that the temperature increases 7.40 C during the reaction. The specific heat of the reaction solution is known to be...
January 30, 2013 by Joe

Algebra II
1) There is a solution to x = -(y-5)^2 and x = (y -5 )^2 + 7 a) true b) false 2) There is no real solution to y = -1 and y = x^2 + 9 a) true b) false 3) the vertex of the graph of y = 3(x+ 9)^2 + 5 is a minimum value ? a) true b) false 4)find the center and radius of the ...
April 17, 2011 by anonymous

Soc 331
Discuss current trends affecting social welfare. Do modern trends favor the solution of social issues? What are the most effective social welfare organizations today in your opinion, and why? I think that modern trends do favor solution, but I'm not exactly sure how. i believe...
November 16, 2011 by Karen

Chemistry!!!
Consider a solution that is 0.022 M in Fe2+ and 0.014 M in Mg+2. A). If potassium carbonate is used to selectively precipitate one of the cations while leaving the other on solution, which cation will precipitate first? What minimum concentration of K2CO3 will trigger the ...
March 21, 2012 by ALISON

chemistry
Suppose that 2.25 grams of CuSO4 are dissolved in 930 mLs of 0.30 M ammonia. What concentration (Molarity) of Cu2+ ion is expected to be free in the aqueous solution and not bound to ammonia in the complex ion Cu(NH3)42+? The Kf for Cu(NH3)42+ is 5.0 x 1013. (Hint: assume ...
April 7, 2013 by Anonymous

Statistics .05 level
According to a survey conducted in October 2001, consumers were trying to reduce their credit card debt (Extracted from M. Price, Credit Debts Get Cut Down to Size." Newsday, November 25, 2001, p. F3). Based on a sample of 1000 consumers in October 2001 and in October 2000. ...
August 12, 2008 by Student

Chemistry
A calorimeter contains 21.0 mL of water at 14.0 degreesC. When 1.90 g of X (a substance with a molar mass of 70.0 g/mol) is added, it dissolves via the reaction X(s)+H_2O(l)reacts to make X(aq) and the temperature of the solution increases to 28.5degreesC. Calculate the ...
October 22, 2010 by Ellen

Chemistry
You carefully weigh out 19.00 of powder and add it to 76.95 of solution. You notice bubbles as a reaction takes place. You then weigh the resulting solution and find that it has a mass of 88.16 . The relevant equation is CaCO3+2HCl ----> H2O + CO2 + CaCl2 Assuming no other ...
September 9, 2011 by ALISON

business math
I figured out question (a) However, I am having a problem coming up with the correct answer for (b). Can someone offer me some assistance. Thank you. Question: You receive the results of a paired-comparison preference these of four soft drinks from a sample of 200 persons. The...
December 1, 2007 by george

science(chem)
What would cause the peaks in a IR analysis to be smaller than they should be? My sample had the right peaks where they should be and they were the right shape but were shorter then they should be. Something different is what the y axis says on the IR analysis that they gave ...
March 28, 2008 by ~christina~

chemistry
1.If its molar solubility is designated by x, then which of the following expressions best represents the solubility product for the substance Ag2SO4? a) x2 b) 27x4 c) 4x3 d) 108x5 e) 3x4 2. Consider the equilibrium, 4HCl(g) + O2(g) 2H2O(g) + 2Cl2(g). The equilibrium law ...
August 3, 2011 by tt

Chemistry
2.01 g of sodium sulfate How would I figure out the number of moles of sulfure atoms in that sample?
February 23, 2008 by TAG

physics
a 0.03 mol sample of helium is taken through a cycle. the temperature of state A is 400K. calculate V.
June 9, 2008 by shelly

chemistry
A sample of 300.0g of drinking wtare is found to cntain 38 mg Pb. What is this concentration in parts per million?
May 8, 2009 by peter

statistics
Can you show to me sample of Sales and seven year moving average. please give the step. Thank you
August 19, 2009 by Danny

Chem
A 0.370mol sample of a metal oxide (M2O3) weighs 55.4g. How many moles of O? How many grams of M? And what is the unknown element M?
September 29, 2009 by JP

chemistry
chemical analysis shows hemoglobin contains 0.34% of Fe by mass. How many moles of Fe wold be in a 100.00 g sample? Thank you.
October 26, 2009 by Brittany

Chemistry
A 3.26g sample of metallic sodium is added to 200mL of water. How many moles of NaOH are produced?
November 2, 2009 by L

science
Should humans strive to preserve a representative sample of all biomes or aquatic zones?
February 10, 2010 by Shirley

Chemistry
why is it not necessary to wait for the entire sample of water to freeze in order to determine its freezing point?
February 17, 2010 by Anonymous

Chemistry
A 155g sample of an unknown was heated from 25.0 to 40.00c absorbing 5696J of energy. what is the specific heat?
February 18, 2010 by Laverne

Chemistry
What is a reasonable discussion of the method for the preparation of a sample of lead iodide and hygrated copper sulphate?
March 17, 2010 by Gillian

Chemistry
A 2.00g sample of a gas SX6 has a volume of 329.5 cm3 at 1.00 atm and 20 celcius. What element is X?
March 26, 2010 by Meg

medical law and ethic
A patient rolling up a sleeve to have a blood sample taken is an example of what?
May 2, 2010 by Shun

science
Should humans strive to preserve a representative sample of all biomes or aquatic zones?
May 11, 2010 by misty

chemistry
A sample of ammonia (Kb = 1.8 * 10-5) is titrated with 0.1 M H2SO4. At the equivalence point, the pH is approximately Isn't it should be 5 right i believe.
May 18, 2010 by George2

Algebra 2: Prob and Stats
Find the sample size that produces the margin of error +-4.0% a) 325 b) 25 c) 16 d) 625
May 24, 2010 by Skye

chemistry
if oxygen is removed from a sample of airas iron rusts , what happens to the total pressure of the air ?
May 30, 2010 by Anonymous

statistical applicatons
Why is it important to learn what sample size was used in a study in which no statistica difference was found?
July 10, 2010 by Jerry

Statistics
. Using Excel, find the t-score that corresponds to the following Confidence Levels and Sample Sizes: a. 95% with n = 25 b. 96% with n = 15 c. 97% with n = 21 d. 91% with n = 10
August 14, 2010 by Shanta

Biology
Should humans strive to preserve a representative sample of all biomes or aquatic zones?
August 25, 2010 by Terra

Chemistry 1151
what is the pressure of a 0.85 Liter sample of Helium with a mass of 0.070 grams when it is at 5 degrees Celcius?
October 6, 2010 by Sydney

chemistry
A 2.50X102 g sample of an unknown hydrocarbon contains 3.28X101 g of hydrogen. How many moles of carbon does it contain?
October 20, 2010 by angie

math
3^2 is my sample but it says explain their funcutions for eachother. what exactly does it mean. can you give me a function for my problem.
October 26, 2010 by kayla

Math
What is the propability that a random sample of 30 days in august has a mean high tempature less then 78 degreese?
October 30, 2010 by Sherrie

Science
Should humans strive to preserve a representative sample of all biomes or aquatic zones?
December 6, 2010 by Aim

5th math
If a spinner is divided into 8 congruent sectors what is the sample space ? there a 2 1's, 2's. 3's and 4's that make up the segments
January 17, 2011 by jill

statistics
Let X be the average of a sample of 16 independent normal random variables with mean 0 and variance 1. Determine c such that P (X< c) = .5
March 9, 2011 by Anonymous

statistics
Start with x = 100 and add four x values to make a sample of five data such that: a. s = 0 b. 0 < s < 1 c. 5 < s < 10 d. 20 < s < 30
April 5, 2011 by julie

Statistics 103
Why do most of the sample means differ somewhat from the population mean? What is this difference called?
April 13, 2011 by Jennifer

Chemistry
A 5267ml sample of h2 is collected at 772 mmhg and 21C. What would the volume be if it is cooled to oC and 1 atm?
April 26, 2011 by Terrie

chemistry
AQUEOUS SODIUM HYDROXIDE IS ADDED TO SAMPLE X AND IS WARMED A GAS EVOLVES HCL WHAT IS THE EQUATION
May 12, 2011 by Anonymous

statistics
Define the terms parameter and statistic. Be sure that the concepts of population and sample are included in your definitions.
June 22, 2011 by Liz

statistics
What is the relationship between Sample Size and the width of the Confidence Interval? Please explain further as to why
September 16, 2011 by denise

chemistry
If the density of an element is 6 g/ml, how much space (in milliliters) should a sample of it displace if it has a mass of 2.4 grams?
September 22, 2011 by gia

chemistry
a sample of carbon dioxide gas has a mass of 52.0g. how many oxygen atoms arr present?explain
October 2, 2011 by anu

Chem
A radiation lab orders 64uCi of P-32. After 42 days the activity of the sample is 8.0uCi. What is the life of P-32? Thanks
October 19, 2011 by Emily

chemistry
A sample of a compound is found to contain 21.84kg of phosphorous &28.16g of O2.find its emphirical formula
November 7, 2011 by Luc

Chemistry
If 42.8 L of helium gas is collected at a temperature of 277K and has a mass of 4.84 grams, what is the pressure of the sample in torr?
December 7, 2011 by Cami

chemistry
Calculate the approximate volume of a 0.600 mol sample of gas at 15.0 degrees C and a pressure of 1.10 atm.
December 15, 2011 by clint

english
I did my thesis paragraph. 1. history 2. background 3. theory 4. benefits Is their any sample that I can see, so I know if Im in the right direction
March 8, 2012 by yacob

Organic Chemistry
Why would the presence of crystals of sample at the starting line cause streaking on a TLC plate?
March 19, 2012 by Sally

Chemisttry
A 100.0-mL sample of 0.250 M aniline (C6H5NH2) is titrated with 0.500 M HCl. What is the pH at the equivalence point?
May 6, 2012 by Jake

Statistics
How large a sample of U.S. adults is needed in order to estimate U with a 95% confidence interval of length 1.2 hours?
June 25, 2012 by Pat

Chemistry
What is the HCl concentration if 72.1ml of 0.035M NaOH is required to titrate a 20.0ml sample of the acid?
July 18, 2012 by Sara

Chemistry
A gas sample absorbs 53KJ of heat and does 18 KJ of work. Calculate the change in its internal energy
August 14, 2012 by Gisselle

chemistry
Assuming that 0.5 grams of a 1.0 gram sample is CaCO3, what should the concentration of HCl(M) be if you want to use 25.0 mL for the titration?
September 22, 2012 by Tyler

stats
1. Find the sample variance and standard deviation 6, 53,11,49,35,26,28,28,31,31 s squared = (round to the nearest hundredth as needed)
October 2, 2012 by pat

science
If the pressure of 20.0 mL of a gas sample is increased by 4 times and the absolute temperature is doubled, what is the new volume?
October 30, 2012 by Mickeykalle

chemistry
If 75mL of a hard water sample required 23.00 mL of .200 M EDTA, calculate the total hardness
November 1, 2012 by Jen

chem
a volume of 122mL of argon, Ar, is collected at 500 degrees C and 758 torr. what does this sample weigh?
November 3, 2012 by tracy

chemistry
a volume of 122mL of argon, Ar, is collected at 500 degrees C and 758 torr. what does this sample weigh?
November 3, 2012 by Tracy

Chemistry
For a given sample of CH3OH, the enthalpy change on reaction is 17.0 kj. How many grams of hydrogen gas are produced?
November 10, 2012 by Sherri

statistics
Which of the following is NOT true with respect to the properties of probability? 0 < x < 1 P(S) = 1, where S is the sample space P(A) + P(Ac) = 0 If two events are independent then P(A and B) = P(A) * P(B)
November 14, 2012 by joey

statistics
Which of the following is NOT true with respect to the properties of probability? 0 < x < 1 P(S) = 1, where S is the sample space P(A) + P(Ac) = 0 If two events are independent then P(A and B) = P(A) * P(B)
November 15, 2012 by joey

Chemistry 3A
A volume of 122mL of argon, Ar, is collected at 50 degrees Celsius and 758 torr. What does this sample weigh?
December 4, 2012 by Gurjot

chemistry
A sample of gas has a mass of 0.585g . Its volume is 110mL at a temperature of 95^\circ C and a pressure of 745mm\;Hg .
December 12, 2012 by sydney

Biology
Do you think the Dough will rise the fastest in the sample with the highest , the lowest , or a moderate concentrate of sugra?
December 13, 2012 by Shay

Chem.
What is the mass (in kilograms) of a cube of silver that measures 0.68m on each side, when the density of the sample is 10.5g/cm3
January 20, 2013 by nick

Biology
If the original amount of Carbon-14 is 142 kilograms, how much will the sample weight in 11,400 years?
March 7, 2013 by Jada

Chem
What will be the temperature of a 3.5 gram sample of carbon dioxide gas in a 2.5 liter container at .955 atm
April 1, 2013 by Ben

Statistics
There is a random selection of 150 students. What is the probablity that the sample percentage of correct identification is greater than 75%?
June 18, 2013 by Katie

chemestry
A 1.00 g sample of naphthalene (C10H8) contains 0.562 g of hydrogen. What is the mass percent of carbon in the compound
September 13, 2013 by camm

Chemistry
If 5.01 moles of an ideal gas has a pressure of 4.81 atm, and a volume of 86.95 L, what is the temperature of the sample in degrees Celsius?
November 19, 2013 by Noelia

chemistry
Determine the specific heat of a material if a 27.3 g sample absorbed 44.2 J as it was heated from 293 K to 336 K.
March 17, 2014 by Bubba

chemistry
a sample of ethane has the same mass as 10million mulecules of methane. how many moles of CO2 are left?
June 17, 2014 by shish

chem
If the passing of three half-lives leaves 33.1 mg of a strontium-90 sample, how much was present in the beginning?
October 6, 2014 by Mg Good

Stats
for a sample of n=20 how large a Pearson correlation is necessary to be statistically significant for a two tailed test
December 4, 2014 by Ivan

Chemistry
What is the HCl concentration if 65.8mL of 0.300M NaOH is required to titrate a 15.0mL sample of the acid?
December 18, 2014 by Ken

chemistry
A sample of co2 occupies 6.00l at 25c and 700. MmHg. What is the volume of the gas at stp
December 21, 2014 by k

Chemistry 1
You carefully weigh out 17.00g of CaCo3 powder and add it to 68.85g of HCl solution. You notice bubbles as a reaction takes place. You then weigh the resulting solution and find that it has a mass of 78.88g . The relevant equation is CaCo3(s)+ 2HCl(aq)---> H2O(l)+ CO2(g)+...
May 30, 2011 by Christy

Stats II
I have a question on a quiz and I dont even know where to begin on figuring out the question... please help: Measurements on the percentave of enrichment of 12 fuel rods used in a nuclear reactor were reported as follows: 3.11 2.88 3.08 3.01 2.84 2.86 3.04 3.09 3.08 2.89 3.12 ...
June 5, 2007 by Haley

Chemistry..
A protein subunit from an enzyme is part of a research study and needs to be characterized. A total of 0.180 g of this subunit was dissolved in enough water to produce 2.00 mL of solution. At 28C the osmotic pressure produced by the solution was 0.138 atm. What is the molar ...
May 29, 2009 by Saira

Science - chemistry
The SO2 present in air is mainly responsible for the phenomenon of acid rain. The concentration of SO2 can be determined by titration against a permanganate solution of known concentration as follows: SO2 + MnO4^-1 -> SO4^-2 + Mn2+ (unbalanced) Balance the equation showing ...
June 8, 2014 by Teagan

chemistry
A galvanic cell consists of an electrode composed of nickel in a 1.0 M nickel(II) ion solution and another electrode composed of silver in a 1.0 M silver ion solution, connected by a salt bridge. Calculate the standard potential for this cell at 25 C. Standard reduction and ...
February 27, 2012 by katie

chemistry
A galvanic cell consists of an electrode composed of nickel in a 1.0 M nickel(II) ion solution and another electrode composed of silver in a 1.0 M silver ion solution, connected by a salt bridge. Calculate the standard potential for this cell at 25 C. Standard reduction and ...
February 27, 2012 by katie

Chemistry
A solution is prepared by adding 50.3 mL of concentrated hydrochloric acid and 16.6 mL of concentrated nitric acid to 300 mL of water. More water is added until the final volume is 1.00 L. Calculate [H+], [OH -], and the pH for this solution. [Hint: Concentrated HCl is 38% HCl...
February 28, 2012 by Andre

Chemistry
A solution is prepared by adding 47.3 mL of concentrated hydrochloric acid and 16.3 mL of concentrated nitric acid to 300 mL of water. More water is added until the final volume is 1.00 L. Calculate [H+], [OH -], and the pH for this solution. [Hint: Concentrated HCl is 38% HCl...
May 21, 2012 by Andrew

chemistry
A solution containing 16.9 grams of a molecular compound dissolved in 250 grams of water has a freezing point of -0.744 degrees celcius. Find the molaltity of the solution. I have -0.744=-1.86*m*i. how do i find i. what is the gfm of the solute? I know that the GFM=Mass/moles...
April 9, 2008 by asldsfjaljd

Chemistry - Science (Dr. Bob222)
Posted by Ana on Saturday, May 3, 2014 at 11:23am. A zinc-copper battery is constructed as follows (standard reduction potentials given below): Zn | Zn2+ (0.10 M) || Cu2+ (2.50 M) | Cu Zn2+ + 2 e- → Zn(s) E = -0.76 V Cu2+ + 2 e- → Cu(s) E = 0.34 V The mass of ...
May 5, 2014 by Ana

Statistics
Which of the following statements is not true about samples that can be treated as matched pairs data? I. Data collected on these samples is analyzed by calculating the differences between paired observations and using that data in one sample tests. II. Each value in the first...
January 24, 2013 by Bob

chem
If 0.752 g of pure sodium carbonate was dissolved in water and the solution titrated with 25.90 mL of hydrochloric acid to a methyl orange end point, calculate the molarity of the hydrochloric acid solution. (Hint: This process takes the carbonate ion to carbon dioxide.) Do I ...
April 3, 2011 by Beth

Precalculus
Calculate the solution set. x^2+y^2+8x=-15 9x^2+25y^2=225 My work: I did elimination...multiplied -25 to the top equation and got..... -16x^2-200x-600...I then used quadratic formula ... And got -7.5 and -5..... Is -7.5 an EXTRANEOUS SOLUTION because when I plugged -7.5 in for...
May 24, 2014 by Anonymous

Math
A juice concentrate containing 65% solids is added to a single-strength juice solution(containing 15% solid), in order to generate a final product which contains 45% solids. Calculate the amounts required for the concentrate and for the single strength solution to produce ...
February 7, 2012 by Janice

MATH..-HELP ME PLEASE GUYS..THIS DUE TMORROW!!!!..
Suppose tank A consist of 500 liter brine with 500gm salt dissolved in it, whereas in tank B containing 500 liter of water. Water is allowed to enter tank A at a rate of 30 liter/minute, and that mixed solution flow from tank A to tank B at a rate of 40 liter/minute. At the ...
April 24, 2013 by cecyl

AP CHEM
Please help me with these AP CHEM homework problems problems and show me the steps: Mass per Volume Results for Titrations: Determine the mass per volume results requested in the following problems. #23) A particular water supply is found to contain 0.000160 MAs, what is the ...
July 31, 2008 by shylo

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