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April 18, 2014

Search: a sample of oxygen that occupies 1.00*10^6 mL at 575mm Hg

Number of results: 101,788

Chemistry
A sample of Oxygen has occupies 1.00x10^6mL at 575mm Hg is subjected to a pressure of 1.25atm. What will the final volume of the sample be if the temperature is held constant v2=(p1)(p2)/p2 I'll have to convert 1.25atm to mm first 1.25atm*760mm/1.0atm = 950. mm V2=(575mm)(1....
Wednesday, March 18, 2009 at 11:18pm by Chopsticks

more CHEM proofreading
for this question A sample of air has a volume of 140.0 mL at 67 degrees celcius. At what temperature would its volume 50.0 mL at constant pressure I did 140.0 ml... 67+273=340 T2... 50.0 140.0=50.0 340=T2 340*50.0/140.0=121.4 This question i don't get because of the ...
Sunday, April 27, 2008 at 8:06pm by jerson

chemistry
A sample of oxygen that occupies 1.00x10^6 mL at 575 mm Hg is subjected to a pressure of 1.36 atm. What will the final volume of the sample be if the temperature is held constant?
Wednesday, February 27, 2013 at 12:49pm by peyton

chemistry
A sample of oxygen that occupies 1.00x10^6 mL at 575 mm Hg is subjected to a pressure of 1.36 atm. What will the final volume of the sample be if the temperature is held constant? How would I set up this equation?
Monday, March 4, 2013 at 12:35pm by kate

physical science
a sample gas occupies 1.00 x 10 to the 6th at 575 mm Hg. if the pressure is changed to 950 mm Hg, what will its volume be if the temperature remains the same?
Tuesday, September 17, 2013 at 6:31pm by Anonymous

chemistry
A sample of oxygen at 25 degrees C occupies 697 mL. If this sample later occupies 1062 mL at 55 degrees C and 1.3 atm, what was its original pressure? Answer in units of atm
Monday, April 23, 2012 at 7:07pm by please help

chemistry
The volume of the container is unknown but the density and mass of Hg is given so you can calculate the volume. Note that the volume when Hg is in the container and when water is in the container is the same. The volume is the volume is the volume. (Side note: density/density ...
Wednesday, April 7, 2010 at 8:06pm by DrBob222

Chem
Would you please tell me if these are right? A sample of helium has a volume of 325 ml and a pressure of 655 mm hg. What will be the pressure if the helium is compressed to 125 ml (t and n are constant) I got 1703 mm of Hg A 75.0 ml sample of oxygen has a pressure of 1.50 atm...
Saturday, October 23, 2010 at 8:42pm by Jason

chemistry
A typical air sample in the lings contains oxygen at 100 mm Hg, nitrogen at 573 mm Hg, carbon dioxide at 40mm Hg and water at 47 mm Hg. What is the total pressure on the sample in mm Hg?
Friday, November 19, 2010 at 1:46pm by Jazz

CHEMISTRY URGENT!
a sample of oxygen that occupies 1.00 x 10^6mL at 575mmHg is subjected to a pressure of 1025atm. what will the final volume of the sample be if the temperature is held constant? how do uu set up the equation
Sunday, February 3, 2013 at 5:12pm by kacie

chemistry
please can someone help me with these questions? 24) Which represents the largest pressure? A) five mm Hg B) one atmosphere C) one millimeter of mercury D) one hundred pascals E) five pounds per square inch 25) What would be the new pressure if a 400 mL gas sample at 380 mm Hg...
Monday, November 9, 2009 at 1:31pm by brandy

Chemistry
Tungsten trioxide (WO3) has a rich yellow color and is often used as a pigment in ceramics and paints. In order to test a ceramic vase for its WO3 content, a 10.10 g sample of the vase was ground and reduced with Pb(Hg) to convert any WO3 to W3 . The resulting W3 was ...
Tuesday, April 16, 2013 at 10:31pm by Jessica

Chemistry honors
You have 2.657 x 10^2 mL of oxygen gas (O2) at 7.02 x 10^2 mm of Hg and 46 oC. What is the mass of the sample in milligrams?
Thursday, March 22, 2012 at 10:41am by haley

Chemistry
You know 1 mol oxygen (32.0 grams) occupies 22.4L at STP. Convert 140 mL to grams, then, %oxygen = (mass oxygen/mass original sample)*100 = ??%
Saturday, April 30, 2011 at 7:03pm by DrBob222

chemistry
Tungsten trioxide (WO3) has a rich yellow color and is often used as a pigment in ceramics and paints. In order to test a ceramic vase for its WO3 content, a 10.19 g sample of the vase was ground and reduced with Pb(Hg) to convert any WO3 to W3 . The resulting W3 was ...
Tuesday, May 28, 2013 at 10:36pm by Decisice 2

Chemistry
Hg + Br2 -> HgBr2 1. What mass of HgBr2 can be produced from the reaction of 10.0 g Hg and 9.00 g Br2? What mass of which reagent is left unreacted? 2. What mass of HgBr2 can be produced from the reaction of 5.00 mL mercury (density = 13.6 g/mL) and 5.00 mL bromine (density...
Monday, August 16, 2010 at 10:17pm by Anonymous

CHEMISTRY! DR.BOB PLEASE HELP
Tungsten trioxide (WO3) has a rich yellow color and is often used as a pigment in ceramics and paints. In order to test a ceramic vase for its WO3 content, a 10.19 g sample of the vase was ground and reduced with Pb(Hg) to convert any WO3 to W3 . The resulting W3 was ...
Wednesday, May 29, 2013 at 2:09am by Decisice 2

chemistry
A sample of oxygen occupies 1.00 L. If the temperature remains constant and the pressure on oxygen is decreased to one-third the orginal pressure, what is the new volume?
Monday, November 26, 2012 at 3:07pm by Anonymous

chemistry
You pipet your UNKNOWN into a reaction tube.... 4.00 mL Add a "boat" containing Manganese Dioxide, MnO2 Set up the gas collection apparatus shown on the right. You sink the boat and allow the oxygen generated to collect in the collection flask. The water temperature is...
Sunday, July 28, 2013 at 7:17pm by faruk

Physical science
I need help on how to set up a formula for 27c and 750 mm hg,a sample of hydrogen occupies 5.00 l how much space will it occupy at stp
Tuesday, October 2, 2012 at 5:29pm by Glenda

chemistry
A sample of N2 gas occupies a volume 180 mL at STP. What volume, in L, will it occupy at 640 mm Hg and 295 K?
Thursday, March 29, 2012 at 11:13pm by marie

Chemistry
Determine the molar mass of each of the following gases? A. 2.90 g of gas that occupies 0.500 L at 0 C and 1.00 atm (STP) B. 1.48 G of gas that occupies 2.00 L at 0 C and 760 mmHg (STP) C. 0.726g of a gas that occupies 855 mL at 1.20 atm at 18 C? D. 2.32 G of a gas that ...
Monday, July 19, 2010 at 2:52pm by amy

Chemistry
A sample of oxygen gas occupies 500.0 mL at -185C and 75.0 cmHg. Calculate the temperature in C if the gas has a volume of 221.0 mL at a 55.0 cmHg.
Friday, February 14, 2014 at 6:10pm by Harry

Chemistry
You took a 25.00 mL sample and diluted t 250.0 mL and titrated a 50.00 mL aliquot. You have the weight in the 50.00 mL sample. The weight in the original 25.00 mL sample is weight in titrated sample x (250/50) = ? Now you have the weight in the original 35.00 mL sample and ...
Wednesday, March 28, 2012 at 5:26am by DrBob222

Chemistry
The reference(which I'm calling the standard) sample is 6.8E-4M and 10.00 mL is diluted to 50.0 mL. So the reference standard is 6.8E-4M x (10.0 mL/50.0 mL) = ?M Lstd x M std = Lsample x Msample 1.00cm x ?M std = 2.48cm x M sample Solve for M sample. Then look to see how the ...
Sunday, November 27, 2011 at 3:49pm by DrBob222

Chemistry
A sample of Argon gas at standard pressure occupies 1000 mL. At constant temperature, what volume does the gas occupy if the pressure increases to 800 mm Hg?
Sunday, November 13, 2011 at 9:10pm by Jessie

Chemistry
I have no idea how to do this problems can somebody help me: 1.How many mL of and oxygen gas can be produced form the termal decmpositon of 0.340 g of hydrogen peroxide at 700C and 755 mm Hg? 401 mL 803 mL 1200 mL 1610 mL 2.How many mL of oxygen gas at 25.0C and 755 mm Hg ...
Saturday, April 21, 2007 at 10:49am by Ryan

Chem hw!
1. What pressure would be needed to compress 25.1 mL of hydrogen at 1.01 atm to 25% of its original volume? 2. If the pressure on a 1.04-L sample of gas is doubled at constant temperature, what will be the new volume of the gas? 3. A 1.04-L sample of gas at 759 mm Hg pressure ...
Thursday, March 11, 2010 at 12:18am by Teisha

Chem hw!
1. What pressure would be needed to compress 25.1 mL of hydrogen at 1.01 atm to 25% of its original volume? 2. If the pressure on a 1.04-L sample of gas is doubled at constant temperature, what will be the new volume of the gas? 3. A 1.04-L sample of gas at 759 mm Hg pressure ...
Thursday, March 11, 2010 at 12:18am by Teisha

Chemistry
I'm having trouble trying to figure out how to setup and solve these problems: 1) 2,600.0 mL of air is at 20.0C. What is the volume at 60.0C? 2) A gas occupies 900.0 mL at a temperasture of 27.0C. What is the volume at 132.0C? 3) What change in volume results if 60.0 mL of gas...
Wednesday, March 19, 2014 at 11:00am by Austin

Analytical chemistry
A water sample was analysed using a sodium selective electrode. The electrode response was 75.0 mV. A 10.00 mL aliquot of standard 0.50 mmol/L NaCl solution was added to 10.00 mL of water sample. The well-mixed solution gave a response of 98.0 mV. What is the concentration of ...
Monday, August 12, 2013 at 8:33am by RC

chemistry
A mixture of gases with a pressure of 800.0 mm Hg contains 60% nitrogen and 40% oxygen by volume. What is the partial pressure of oxygen in this mixture? A. 140.0 mm Hg B. 320.0 mm Hg C. 373.0 mm Hg D. 480.0 mm Hg
Sunday, April 17, 2011 at 7:10pm by Anonymous

ap chemistry
A sample of gas occupies 4 mL at STP. At what pressure would this sample occupy 500 mL if the temperature is changed to 525C? Answer in units of torr
Saturday, February 9, 2013 at 7:32pm by cheri

sciencee
1. What pressure would be needed to compress 25.1 mL of hydrogen at 1.01 atm to 25% of its original volume? 2. If the pressure on a 1.04-L sample of gas is doubled at constant temperature, what will be the new volume of the gas? 3. A 1.04-L sample of gas at 759 mm Hg pressure ...
Tuesday, March 9, 2010 at 10:33pm by Teisha

college chemistry
A 0.300 g sample of an aspirin tablet is used to prepare 100.0 mL of a stock solution by dissolving the tablet in 1 M NaOH then diluting with distilled water to the 100 mL mark of a volumetric flask. A 0.30 mL sample of the stock solution is then transferred to a volumetric ...
Thursday, January 17, 2013 at 4:21pm by abbie

chemistry
Record measured absorbance for each tube in following table. Complete the table by calculating the [ Fe(SCN2+)]eq and [Fe3+]initial and [HSCN]initial Data: Volume of 2.00 x 10-3 M Fe(NO3)3 solution, mL 1)5.00, 2) 5.00, 3) 5.00 4) 5.00 5) 5.00 Volume of 2.00 x 10-3 M HSCN ...
Thursday, September 27, 2012 at 11:14am by Brittany S

chemistry
Record measured absorbance for each tube in following table. Complete the table by calculating the [ Fe(SCN2+)]eq and [Fe3+]initial and [HSCN]initial Data: Volume of 2.00 x 10-3 M Fe(NO3)3 solution, mL 1)5.00, 2) 5.00, 3) 5.00 4) 5.00 5) 5.00 Volume of 2.00 x 10-3 M HSCN ...
Thursday, September 27, 2012 at 11:14am by Brittany S

Chemistry
Calculate the molar concentration of acetic acid (CH3COOH) in a 5.00-mL sample of vinegar (density is 1.00 g/mL) if it is titrated with 25.00 mL of NaOH.
Wednesday, March 4, 2009 at 10:23pm by Jake

chemistry
12.00 liters of oxygen gas is under a pressure of 20 mm Hg. If the volume of this gas is decreased to 2.00 liters at constant temperature, what will the new pressure be? I believe this is Boyle's law and the answer should be 120 mm Hg, but according the answer on practice test...
Tuesday, December 4, 2012 at 6:46pm by Jo

chemisty
12.00 liters of oxygen gas is under a pressure of 20 mm Hg. If the volume of this gas is decreased to 2.00 liters at constant temperature, what will the new pressure be? I believe this is Boyle's law and the answer should be 120 mm Hg, but according the answer on practice test...
Tuesday, December 4, 2012 at 9:39pm by Jo

Chem
I don't get how to do this: What is the pH of the solution created by combining 11.30 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? What are the pH values if you take into account that the 8.00 mL of 0.10 M Acid was first...
Monday, October 29, 2007 at 4:00am by Anne

chemistry
sodium metal dissolves im liquid mercury to form of NA(s) and Hg(l) are 0.97 g/ml and 13.6 g/ml respectively. a sodium amalgoum is made by dissolving 10 ml Na (s) in 20.0 ml Hg (l). The final volume of solution is 21.0 ml. Calculate the molarity of Na in the solution.
Thursday, January 31, 2013 at 9:43am by masharat

Science
If a mineral sample has a mass of 10 g, how many grams of oxygen does it contain? You need more information than that to determine the amount of oxygen or any other element in the mineral. Your question is the same kind as, "My car was in the rain today. How much did it rain...
Saturday, December 9, 2006 at 9:42pm by Casey

Chemistry
H occurs as a diatomic molecule (as does oxygen) so the equation should be 2H2 + O2 ==> 2H2O (10 moles H2 will produce 10 moles H2O --ONLY IF there is sufficient oxygen present and that will be 5 moles oxygen needed for 10 moles H2). 1 mole H2O has a molar mass of 18 grams...
Saturday, January 15, 2011 at 8:09pm by DrBob222

Chem
A sample of gas of mass 2.929 g occupies a volume of 426 mL at 0degree Cel and 1.00 atm pressure. What is the molecular weight of the gas? Thanks!
Tuesday, March 9, 2010 at 9:09am by Peter

Chemistry
Hg2+ + 2Cl- → HgCl Mercuric nitrate was standardized by titrating a solution containing 147.6 mg of NaCl(FM 58.44), which required 28.06 ml of Hg(No3)2 solution. Part a: Find the molarity of Hg(No3)2. I already calculated the molarity to be 0.04500 M Part b: When the ...
Sunday, October 16, 2011 at 11:48pm by Asuna

chemistry
What is the pH of the solution created by combining 11.50 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? What are the pH values for HCl and HC2H302 if you take into account that the 8.00 mL of 0.10 M Acid was first diluted...
Friday, May 2, 2008 at 1:04am by Trisha

Chemistry
I can help with the first part. The second part is unclear exactly how the sample was prepared and there is no data given to determine the amount of sample in the packet. The first part is mL x M = mmoles and you are correct in 23.3 mL x 0.1043M = 2.430 mmoles. However, you ...
Tuesday, February 15, 2011 at 2:49pm by DrBob222

chemistry
Heres the simplified version: I need to convert Ni to moles: I have a 0.6215 g sample of Ni that was dissolved in 100.00ml of Fe 3+. Then, 15.00 ml of the sample was taken and titrated. It took 26.48 ml of .0200M Cr2072- to titrate the solution. ] I did the following to find ...
Saturday, June 27, 2009 at 2:48pm by dan

chemistry
A sample of oxygen occupies 10.0 L under a pressure of 105 kPa. At what pressure will it occupy 13.4 L if the temperature does not change?
Wednesday, May 19, 2010 at 8:16pm by maria

Chemistry
what is the mass of a sample of material given that a 5.03 g sample occupies 3.24 mL
Thursday, August 27, 2009 at 7:30pm by Hope

Chemistry
An airplane is pressurized to 650mm Hg, which is the atmospheric pressure at a ski resort at 13,000ft altitude. a. if air is 21% oxygen, what is the partial pressure of oxygen on the plane? b. If the partial pressure of oxygen drops below 100mm Hg, passengers become drowsy. If...
Saturday, May 15, 2010 at 8:08pm by Helen

chemistry
A 40.0 mL sample of 0.150 M Ba(OH)2 is titrated with 0.400 M HNO3. Calculate the pH after the addtion of the following volumes of acid, and plot the pH versus millimeters of HNO3 added. a. 0.00 mL b. 10.2 mL c. 19.9 mL d. 30.0 mL e. 39.8 mL
Monday, June 27, 2011 at 9:02pm by Cindy

Chemistry
I will omit the H2O until the final step. Ba(OH)2 + 2HCl ==> BaCl2 + 2H2O mols HCl = M x L = ? in the 10 mL sample. mols Ba(OH)2 = 1/2 that in the 10 mL sample. mols in a L sample = ? mols in the 10 mL sample x (1000/10) = x mol. M = mols/L.
Thursday, October 25, 2012 at 11:43pm by DrBob222

chemistry
A sample of gas occupies 17 mL at -112C. What volume does the sample occupy at 70C?
Tuesday, July 29, 2008 at 1:06pm by natasha

Chemistry
What are the pH values if you take into account that the 8.00 mL of 0.10 M Acid was first diluted with 100 mL of water? ACID = with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq?
Wednesday, August 20, 2008 at 3:26am by katie

applied chemistry
A sample of oxygen occupies 10.0 L under a pressure of 105 kPa. At what pressure will it occupy 13.4 L if the temperature does not change?
Tuesday, August 3, 2010 at 10:38pm by chris

chemistry
A gas occupies 10 liters at a pressure of 40.0 mm hg. What is the volume when the pressure is increased to 60.0 mm hg
Tuesday, March 20, 2012 at 5:04pm by jr

Chemistry
calculate the ph 25.00 mL solution of 0.125 M acetic acid (Ka= 1.75 x 10^-5) after the addition of each of the following volumes of 0.100 M KOH: 10.00 mL, Vep and 35.00 mL
Sunday, April 21, 2013 at 9:25pm by yoo

Chemistry
A sample of nicotine weighing 0.3204 g was vaporized in a flask with a volume of 487 mL. This sample exrted pressure of 74.3 mm Hg at 20 degrees C. What is the molar mass of nicotine? I know this has to do with N=P*V/R*T. and 1 atm=760 mm Hg. Please help and show work. ...
Thursday, April 28, 2011 at 8:24am by Ben

Chemistry HELP!!
A sample of nicotine weighing 0.3204 g was vaporized in a flask with a volume of 487 mL. This sample exrted pressure of 74.3 mm Hg at 20 degrees C. What is the molar mass of nicotine? I know this has to do with N=P*V/R*T. and 1 atm=760 mm Hg. Please help and show work. ...
Thursday, April 28, 2011 at 10:16am by Ben

chemistry
how do you solve this? What is the pH of the solution created by combining 12.30 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? mL NaOH pH wHCl pH wHC2H3O2 12.30 Complete the table below: What are the pH values if you take...
Monday, July 12, 2010 at 1:05am by Jin

Chemistry
What is the volume of 150. mL of oxygen gas at 72.0C and 110. mm Hg if the conditions are adjusted to 750. mm Hg and 82.5C? Assume the amount of gas is held constant.
Thursday, April 14, 2011 at 3:48pm by Mary

Chemistry please help
Elemental mercury was first discovered when a mercury oxide was decomposed with heat, forming mercury metal and oxygen gas. When a 0.204-g sample of the mercury oxide is heated, 0.189 g of mercury metal remains. a)what is mole ratio of mercury to oxygen in the sample? would it...
Wednesday, February 15, 2012 at 2:50pm by Adam

Chem
What volume of 2.50 x 10-4 M CV+ solution should be diluted to 10.0 mL to prepare a 7.50 x 10-5 M CV+ solution Answer 1.00 mL 3.00 mL 5.00 mL 7.50 mL 33.3 mL
Tuesday, September 3, 2013 at 1:08am by Kristen

Chemistry
200 mcg/mL protein x 0.10 mL = 20 mcg protein. You place that into a total volume of 0.10 mL + 0.90 mL + 2.00 mL so that 20 mcg is now in 3.00 mL (assuming the volumes are additive. Technically they are not but with such dilute solutions the difference is not enough to worry ...
Tuesday, October 8, 2013 at 4:53pm by DrBob222

Chemistry
mass Hg = density(g/mL) x mL = ?? q1 = heat removed in moving liquid Hg from 23.0C to its melting point of -38.8 C. q1 = mass Hg x specific heat liquid Hg x (Tfinal-Tinitial) q2 = heat removed freezing liquid Hg to solid Hg. q2 = mass Hg x heat fusion. Total Q = q1 + q2.
Friday, April 22, 2011 at 8:44pm by DrBob222

Chemistry
An unknown compound analyzes to be 42.85% C, 7.20% H, and 49.95% N. A 0.915 g sample of the gas occupies 250. mL at 760. mm Hg and 100.C. Type your answers using the format CH4 for CH4. Enter the elements in the order given. I have calculated the emperical formula to be CH2N...
Sunday, May 2, 2010 at 4:17pm by Megan

chem
I got part 1: What is the pH of the solution created by combining 1.10 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? pH w/HCl =1.12 w/HC2H3O2(aq)= 3.94 But how do you do part two? What are the pH values if you take into ...
Thursday, April 29, 2010 at 12:13am by Adam

Chemistry
A 0.02847 g sample of gas occupies 10.0-mL at 292.0 K and 1.10 atm. Upon further analysis, the compound is found to be 38.734% C and 61.266% F. What is the MOLECULAR formula of the compound?
Monday, July 2, 2012 at 2:31am by arcos15

Chemistry
13.6 g Hg/cm^3 * 10 cm^3 The cm^3 cancels out and you get 136 g Hg. 136 g Hg * 200.59 g Hg/ 1 mol Hg = 0.68 mol Hg. 0.68 mol Hg * 6.02*10^23 atoms Hg/ 1 mol Hg= 4.08*10^23 atoms Hg
Saturday, July 10, 2010 at 8:26pm by Ana

Chemistry Lab
5.00 mL x 0.005 M = 0.025 millimoles Fe^+3. What is the volume? I see 5 mL + 5 mL + 10 mL = 20 mL. So the initial concn is 0.025 millimoles/20 mL = ?? M If you would rather work as a dilution, it can be done this way: 0.005 M has been diluted by a factor of 5.00 mL/20.00 mL...
Monday, February 22, 2010 at 9:01am by DrBob222

college
suppose you have samples of two metals,A and B. Use the data below to determine which sample occupies the largest volume.. A> mass 25g density 10 g/ml B> mass 65g density 4.0 g/ml
Saturday, August 21, 2010 at 7:20pm by Monica

Chemistry
A 0.02847 g sample of gas occupies 10.0-mL at 292.0 K and 1.10 atm. Upon further analysis, the compound is found to be 38.734% C and 61.266% F. What is the molecular formula of the compound? __________________?
Monday, July 2, 2012 at 2:28am by arcos15

Chemistry
The standard solution were prepared by transferring exactly 1.00 mL, 2.00 mL, 3.00 mL, 4.00 ml, and 5.00 ml, respectively, of stock solution to clean 100 ml vol flads, diluting to the mark with FeCl3 solution, and then filling the aoorioruatekt kabeked cuvette. Calculate the ...
Sunday, February 3, 2008 at 11:03pm by Anonymous

Chemistry
A sample of H2 gas (12.28 g) occupies 100.0 L at 400.0 K and 2.00 atm. How much volume will a 9.49 g sample of H2 occupy at 353 K and 2.00 atm? a. 68.2 L b. 54.7 L c. 147 L d. 109 L e.77.3 L Is it a. 68.2 L?
Sunday, January 3, 2010 at 1:00am by Anonymous

Chemistry
A 25 mL sample of waste water was treated with acid and SCN- to form an intense red complex. This complex was diluted to 100.0 mL and put in a variable pathlength cuvet. For comparison, a 10.0 mL reference sample of 6.8 x 10-4 M Fe3+ was treated with acid and SCN-, and diluted...
Sunday, November 27, 2011 at 3:49pm by Ken

chemistry
how do you solve this What is the pH of the solution created by combining 2.60 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? mL NaOH 2.60 pH wHCl: _ pH wHC2H3O2 : _ Complete the table below: What are the pH values if you ...
Monday, July 12, 2010 at 6:03pm by Jin

chemistry
A 50.00-mL sample of groundwater is titrated with 0.0900 M EDTA. Assume that Ca2 accounts for all of the hardness in the groundwater. If 11.40 mL of EDTA is required to titrate the 50.00-mL sample, what is the hardness of the groundwater in molarity and in parts per million of...
Thursday, April 4, 2013 at 1:26pm by Ashley

Chemistry
Calculate the pH of a solution that is made by mixing 10.00 mL of 0.2500 M HCl with 35.00 mL of .1500 M HNO3 and diluting the mixture to a total volume of 100.00 mL
Thursday, May 5, 2011 at 3:58pm by Dan

chem
Hg = glycolic acid Hg = 0.2M x 50 mL = 10 mmols. KOH = 5mL x 0.25M = 1.25 mmols. .......Hg + OH^- ==> g^- H2O I......10...0........0....0 added......1.25............ C...-1.25.-1.25.....1.25 E.....8.75..0.......1.25..1.25 Use the Henderson-Hasselbalch equation, substitute ...
Friday, January 11, 2013 at 11:18am by DrBob222

Chemistry
A sample of air contains 78.8% nitrogen, 20.94% oxygen, 0.05% carbon dioxide, and 0.930% argon by volume. How many molecules of each gas are present in 1.00 L of the sample at 35 degrees C and 1.00 atm?
Wednesday, July 14, 2010 at 10:19pm by Katie

Chemistry DrBob
What is the pH of the solution created by combining 2.30 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? mL NaOH pH wHCl pH wHC2H3O2 2.30 ________ _________ What are the pH values if you take into account that the 8.00 mL ...
Thursday, May 1, 2008 at 4:53pm by Amy

Chemistry
What is the pH of the solution created by combining 2.70 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? What are the pH values if you take into account that the 8.00 mL of 0.10 M Acid was first diluted with 100 mL of water...
Monday, May 3, 2010 at 3:37pm by Ashley

Chemistry
What is the pH of the solution created by combining 2.70 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? What are the pH values if you take into account that the 8.00 mL of 0.10 M Acid was first diluted with 100 mL of water...
Monday, May 3, 2010 at 3:37pm by Ashley

CHEMISTRY (WEBWORK)
What is the pH of the solution created by combining 1.20 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? mL NaOH pH w/ HCl pH w/ HC2H3O2 1.20 ? ? Complete the table below: What are the pH values if you take into account ...
Monday, July 12, 2010 at 6:19pm by Anonymous

organic chemistry
calculate the mass in grams of 10.0ml if mercury (Hg) is the density Hg 13.6g/ml
Friday, January 14, 2011 at 6:36am by aries 321

chem
i don't get this at all can you please show me how to do this problem: a sample of oxygen occupies 10.0 L under a pressure of 105 kPa. at what pressure will it occupy 13.4 L if the temperature does not change. please help me set it up
Thursday, May 14, 2009 at 6:33pm by melissa

chem lab (webwork)
What is the pH of the solution created by combining 1.80 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? mL NaOH pH wHCl pH wHC2H3O2 1.80 Complete the table below: What are the pH values if you take into account that the 8....
Tuesday, April 13, 2010 at 9:36pm by anonymous

college
how do i figure out the percentage error , as well as the absolute error of a) (10.00+/- .02)mL x .42 mol/L b) (10.00 +/- .02)mL + (10.00 +/- .02)mL thanks in advancee plz help
Friday, January 16, 2009 at 12:51am by eddie

chemistry
A 10.0 mL sample of 3.00 M KOH(aq) is transferred to a 250.0 ml volumetric flask and diluted to the mark. It was found that 38.5 ml of this diluted solution was needed to react the stoichimetric point in a titration of 10.0 mL of a phosphoric acid, H3PO4, solution. The ...
Saturday, June 20, 2009 at 12:16am by dan

Chemistry
A 25.00 ml sample of a standard solution containing 1 g of CaCO3/L required 25.20 ml of EDTA to fully complex the Ca present. Calculate the volume of EDTA stoichiometrically equivalent to 1.0 mg of CaCO3. From the volume of EDTA required in titrating the sample, calculate the ...
Sunday, March 14, 2010 at 11:32pm by Anonymous

chemistry
A 0.2481 g sample of marble was dissolved in 100 mL, and a 10.00 mL aliquot of the solution was titrated to an end point with 23.56 mL of 0.01052 M EDTA solution. What is the molecular weight? I know how to start this problem. Any help is appreciated!
Thursday, October 1, 2009 at 7:21pm by Anonymous

chemistry
A 25.0 mL sample of 1.00 M KBr and a 75.0 mL sample of 0.800 M KBr are mixed. The solution is then heated to evaporate water until the total volume is 50.0 mL. What is the molarity of the KBr in the final soltion?
Monday, August 29, 2011 at 5:47pm by Anonymous

Chemistry
What is the pressure of 495 mL of oxygen gas at 30.5C and 710. mm Hg if the conditions are adjusted to 310. mL and 80.5C? Assume the amount of gas is held constant.
Thursday, April 14, 2011 at 3:48pm by Mary

College Chem
how do i figure out the percentage error , as well as the absolute error of a) (10.00+/- .02)mL x .42 mol/L b) (10.00 +/- .02)mL + (10.00 +/- .02)mL
Friday, January 16, 2009 at 1:26am by eddie

Please help (Bio)
Measurements of oxygen binding by whole human blood, at 37oC, at pH 7.4, and in the presence of 40mm of CO2 and normal physiological levels of BPG (5 mmol/L of cells), give the following: PO2 (mm Hg) = 10.6, 19.5, 27.4, 37.5, 50.4, 77.3, 92.3 % saturation (=100 x Theta) = 10, ...
Friday, September 28, 2007 at 6:32pm by Gulzaman

chemistry
What is the pH of the solution created by combining 12.30 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? mL NaOH pH wHCl pH wHC2H3O2 12.30 What are the pH values if you take into account that the 8.00 mL of 0.10 M Acid was...
Monday, May 5, 2008 at 5:31am by Renee

Chemistry
You have 4.271 x 102 mL of oxygen gas (O2) at 7.656 x 102 mm of Hg and 78 oC. What is the mass of the sample in milligrams? What is the ratio of effusion rates for a light gas, such as HF, to a heavy gas, such as UF4?
Tuesday, April 16, 2013 at 9:49pm by Tif

Chemistry
Find the pH during the titration of 20.00 mL of 0.1000 M butanoic acid, CH3CH2CH2COOH (Ka = 1.54e-5), with 0.1000 M NaOH solution after the following additions of titrant: 0 mL, 14.00 mL, 19.95 mL, 20.00 mL, 20.05 mL, 24.00 mL.
Wednesday, November 23, 2011 at 12:50am by James

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