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July 25, 2014

Search: An unknown amount of water is mixed with 350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 52.5 mL of 6 M HCl. Calculate the concentration of the diluted NaOH solution. Answer in units of M

Number of results: 31,154

Chemistry
An unknown amount of water is mixed with 350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 51.2 mL of 6 M HCl. Calculate the concentration of the diluted NaOH solution. Answer in units of M What volume of water ...
May 13, 2013 by Anonymous

chemisry
An unknown amount of water is mixed with 350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 52.5 mL of 6 M HCl. Calculate the concentration of the di- luted NaOH solution. Answer in units of M
September 19, 2012 by cheri

AP Chemistry
An unknown amount of water is mixed with 350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 52.5 mL of 6 M HCl. Calculate the concentration of the diluted NaOH solution. Answer in units of M
September 11, 2013 by Gabriella

CHEMISTRY
n unknown amount of water is mixed with 350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 52 . 5 mL of 6 M HCl. Calculate the concentration of the di- luted NaOH solution. Answer in units of M
October 18, 2013 by Maria

Physics 20
1. How much heat energy is required to change 500 grams of water at 100 degrees Celsius to steam at 100 degrees Celsius? 2. How much energy is lost if 7kg of water is cooled from 46 degrees Celsius to 2 degrees Celsius? 3. How much energy is gained when a 300g piece of ice at...
June 8, 2014 by Tamai

Physics
Please Help! I am having difficulties grasping these concepts. Explain please! 1. How much heat energy is required to change 500 grams of water at 100 degrees Celsius to steam at 100 degrees Celsius? 2. How much energy is lost if 7kg of water is cooled from 46 degrees Celsius ...
June 8, 2014 by Tamai

AP Chemistry
There is an unknown amount of unlabelled monoprotic acid in an unknown amount of water titrated with a sample with a solution of NaOH of unknown molarity. After adding 10.0 mL of NaOH, the pH=5.0. The equivalence point is 32.22 mL of NaOH. What is the Ka? I have been looking ...
March 8, 2011 by Ben

chemistry
If the atmospheric pressure is not corrected for vapor pressure of water, what effect will this have on number of moles of oxygen calculated? Use numbers from your experiment and determine the percent deviation caused by this omission. Is this a significant error? this is a ...
September 3, 2010 by Anonymous

chemistry
Dissolve 1.5g of an unknown salt into 37g of water and find that the new vapor pressure at 75C is 277 torr. What is the Molar Mass of the unknown? How many grams of the unknown would have to be used in 100ml of water to make a 11.5% solution by mass of the unknown?
December 5, 2010 by regina

chemistry
When 86.7 g of water at a temperature of 73 C is mixed with an unknown mass of water at a temperature of 22.3 C the final temperature of the resulting mixture is 61.7 C. What was the mass of the second sample of water? (Specific heat of water 4.184 Jg-1C-1)
April 9, 2013 by Anonymous

chemistry
When 86.7 g of water at a temperature of 73 C is mixed with an unknown mass of water at a temperature of 22.3 C the final temperature of the resulting mixture is 61.7 C. What was the mass of the second sample of water? (Specific heat of water 4.184 Jg-1C-1)
April 9, 2013 by Anonymous

Chemistry
An unknown amount of water is mixed with 310 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 58.2 mL of 6 M HCl. Calculate the concentration of the diluted NaOH solution. Answer in units of M What volume of water ...
March 19, 2012 by ag

Chemistry
An unknown amount of water is mixed with 310 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 58.2 mL of 6 M HCl. Calculate the concentration of the diluted NaOH solution. Answer in units of M What volume of water ...
March 19, 2012 by ag

Chemistry
When 112 g of water at a temperature of 22.5C is mixed with 65.1 g of water at an unknown temperature, the final temperature of the resulting mixture is 46.3C. What was the initial temperature of the second sample of water?
October 8, 2010 by Noelle

chem
(5) In this experiment MnO4-is reduced to Mn 2+ by the unknown. What is the equivalent weight of MnO4- for this experiment? 52.68 (6) How many equivalents of electrons were transferred from the unknown solution? (7) What is the Normality of the 1.00 mL of the unknown solution...
October 27, 2011 by bry

Chemistry
Please help me!! 350.0 ml of water is heated from 20.5 C to 98.2 C. What is the amount of energy required for this change?
March 6, 2014 by Josee

Chemistry
Freezing point of pure water = -2, Freezing point of Unknown solution = -1 Mass of unknown in 50g of water = 1.9964g. Calculate the delta T for the solution of the unknown solid and determine the molecular weight of the unknown solid.
February 2, 2013 by Anna

math
Initially a pool contains 350 gallons of water. A hose is placed in the pool, and the water is turned on. The hose adds 4.8 gallons of water per minute. Write an equation that shows the relationship between the total amount of water in the pool, V, and the number of minutes ...
November 15, 2009 by jeng

Chemistry
I did a lab for Organic Chemistry We did a simple distillation of an unknown alcohol to determine the boiling point, which was found to be 74*C The four possibilities for the unknown were methanol, ethanol, 1-propanol and 2-propanol. So from the boiling point the unkown must ...
October 5, 2010 by Laura

Chemistry - Please help!!
I did a lab for Organic Chemistry We did a simple distillation of an unknown alcohol to determine the boiling point, which was found to be 74*C The four possibilities for the unknown were methanol, ethanol, 1-propanol and 2-propanol. So from the boiling point the unkown must ...
October 5, 2010 by Laura

Science
Write the formula, substitute numbers and units(labels)Mike mixed 20g of 60C water with 40g of 25C water. The final temperature was 39C. 1.Calculate the change of temperature for hot water. 2.Calculate the calories transferred from the hot water. 3.Calculate the amount of heat...
March 29, 2010 by Jamie

thermochem
An unknown volume of water at 18.2C is added to 27.0 mL of water at 36.7C. If the final temperature is 23.5C, what was the unknown volume? (Assume that no heat is lost to the surroundings; d of water is 1.00 g/mL.)
October 5, 2008 by james

ap chemistry
A 0.456 gram sample of an unknown mono- protic acid (lets call it HZ) was dissolved in some water (you pick the amount). Then the acidic solution was titrated to the equivalence point with 32.5 mL of 0.174 M KOH. What is the molecular weight of the unknown acid HZ? 1. 103.2 g...
March 5, 2013 by cheri

AP Chemistry
A very old and tired , grey haired AP Chem instructor wanted to determine the Ka of an unlabelled monoprotic acid in his stockroom. He dissolved an unknown amount of acid in an unknown amount of water and proceeded to titrate the sample with a solution of NaOH of unknown ...
February 24, 2013 by Sarah

Chemistry
A very old and tired , grey haired AP Chem instructor wanted to determine the Ka of an unlabelled monoprotic acid in his stockroom. He dissolved an unknown amount of acid in an unknown amount of water and proceeded to titrate the sample with a solution of NaOH of unknown ...
February 24, 2013 by Kat

Chemistry
A very old and tired , grey haired AP Chem instructor wanted to determine the Ka of an unlabelled monoprotic acid in his stockroom. He dissolved an unknown amount of acid in an unknown amount of water and proceeded to titrate the sample with a solution of NaOH of unknown ...
February 24, 2013 by Summer

mat 116
two large storage tanks, T and W contain water. T starts losing at the same time additional water starts flowing into W. The graph below shows the amount of water in each tank over a period of hours. Assume the rates of water loss ad water gain continues as shown. At what ...
March 2, 2014 by csrla

CHEMISTY
Determine the molarity of sodium cations in solution when 6.21 g of sodium sulflate are mixed with 2.97 g of sodium nitrate in pure water to produce 350.0 mL of solution.......please explain every step. thanks!
December 13, 2010 by Jenni

Chemistry
The vapor pressure of water at 95C is normally 6.33.9 but decreased to 561.2mmHg upon addition of an unknown amount of NaOCl to 164.3g of water at this temp. How many grams of NaOCl was added assuming complete dissociation of the solute
April 23, 2011 by Jay

math 115
1. divide26/634=24r10 is this correct? 2. subtract. 104.567-78.658= 25.909 is this correct? 3.identify the rate, base and amount in the following statement. 30% of 350 =105 350x.3=105 rate=30% base=350 amount=105. is this correct? 4. what is 60% of 250? =150. is this correct? ...
September 6, 2009 by Lea

Chem
a solution containing 100g of unknown liquid and 900g water has a freezing point pf -3.33 C. given kf=1.86 degrees c for water, the moelcular weight of the unknown liquid is what?
February 12, 2012 by Court

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

chemistry
this is a lab i am working on and this is what is says: Solution A is mixed with water to produce solutions of varying concentration. These altered concentrations of solution A is added to a set amount of solution B and the reaction times are noted when the solutions are mixed...
January 5, 2012 by Arnold

chemistry
The procedure described in this experiment was used to determine the molar mass of unknown liquid (non-electrolyte). The solution was made by mixing 0.961 g of the unknown with 100.0 g of water. The freezing point depression of the solution was −3.7C. Calculate the ...
April 19, 2012 by hereyago

Alebra
Kathy works at an optical store selling eyeglasses. Each week she earns $180 plus a 2% commission of her total sales for the week. Next week she wants to earn at least $350. 1. Write an inequality that represents the dollar amount of eyeglasses kathy must sell to earn at least...
January 3, 2012 by Megan

Chemistry
At 22 C an excess amount of a generic metal hydroxide M(OH)2, is mixed with pure water. The resulting equilibrium solution has a pH of 10.49. What is the Ksp of the salt at 22 C?
March 16, 2013 by Anon

chemistry
In my experiments I mixed different ratios of CuSO4 and NaS. The ratio in which I had the greatest amount of precipitate was when I mixed 3mL CuSO4 : 3mL NaS. Now my question: What is indicated by the maximum amount of precipitate...? Thanks in advance.
July 10, 2013 by Michelle

Chemistry
determine the amount of water formed in 4NH3 + 5O2 4NO + 6H2O if 10 g of Oxygen is mixed with 10g nitrigen trihydride in grams
February 21, 2014 by Lee Walkr

Chemistry
A mass of 0.200 kg of an unknown metal at 94C is placed in 0.3 kg of water at 10C. The final temperature of the metal and water are 20C. What is the specific heat capacity of the unknown metal?
October 20, 2010 by Cas

Chemistry
The vapor pressure of pure water at 85 celsius is normally 433.6 mmHg but decrease to 393.8mmHg upon addition? of an unknown amount of ammoniu chloride NH4Cl to 162.2g of water at this temperature. How many grams of ammonium chloride were added assuming complete dissociation ...
February 20, 2011 by Jude

chemistry
Melting point experiment: how do i know the calibration curve? we did an experiment where: week one we did a graph with the melting points of different compounds. week 2 we used the graph to correct the melting point of unknown # 1 and then unknown # 2 we mixed unknown 2 with ...
January 18, 2011 by jessica

Chemistry
The water loss by the sample, and the precent by weight of the water in the unknown hydrates 34.78%H2O. which of the ten possible hydrates are the most likely ones to be your unknown based on the percent by weight?
April 7, 2013 by judy

Urgent - Physics
The U-shaped glass tube in the figure below contains two liquids in mechanical equilibrium: sea water of density 1.025 kg/L, and an unknown liquid of density ρ. The unknown liquid is in the left tube, floating on top of the water with a clearly visible interface. Use h1...
January 27, 2009 by Jen

Chemistry
When 1.150 grams of an unknown nonelectrolyte dissolves in 10.0 grams of water, the solution freezes at -2.16C. What is the molecular weight of the unknown compound? Kf for water = 1.86C/m. -2.16 x m/-1.86 = 1.16 1.16/ .010 kg of water= 116 1.150/116= 9.91 g/mol is the ...
February 10, 2013 by Marcus

chemistry
A solution which contains 40.3 g of an unknown molecular compound in 360 g of water freezes at -5.07C. What is the molar mass of the unknown?
November 26, 2012 by paul

chemistry
Calculate the value of q for each of the experiments listed below. (Assume the heat capacity of water is 4.1801 J/g*C). Exp1: 2.48g of an unknown salt added to 160. mL of water resulted in a change of temperature of -0.1 C. Exp2: 2.48g of an unknown salt added to 160. mL of ...
July 7, 2014 by Stuck

Chemistry
An unknown metal, heated to an unknown temperature until a liquid is dropped into a calorimeter that has 250 ml of water. The water heats up from 22 degrees Celcius to 29 degrees Celcius, at which point the temperature of the water and metal are equal. How much energy in ...
December 4, 2010 by Ivy

Chemistry
At 22 C an excess amount of a generic metal hydroxide M(OH)2, is mixed with pure water. The resulting equilibrium solution has a pH of 10.49. What is the Ksp of the salt at 22 C? Is the ksp=1.38*10^-11?
March 17, 2013 by Anon

Chemistry I
An unknown volume of water at 18.2 degrees celsius is added to 24.4 mL of water at 35.0 degrees celsius. If the final temperature is 23.5 degrees celsius what was the unknown volume? (assume no heat is lost to surroundings and D of water is 1.00g/mL)
October 12, 2008 by Kelsie

Chemistry
Calculate amount (in grams) of unknown acid used for titration. You want 30 mL of titrant to get the equivalence point. Assume that the base is 0.05 M and the unknown acid molar mass is around 400 g/mol.
March 23, 2013 by Justine

physics
A column of water of height h1 = 70.0 cm supports a column of an unknown liquid h2 = 30.0 as suggested in the figure (not drawn to scale). Assume that both liquids are at rest and that the density of water is 1.0x103 kg/m3. Determine the density of the unknown liquid.
January 17, 2010 by sara

College Chemistry
The Water loss by the sample, and the percent by weight of water in the unknown hydrates is 34.78%H2O. which of the ten possible hydrates are the most likely ones to be your unknown based on the percent by weight?
April 7, 2013 by judy

physical
in a water tank is filled wiyh 1026 lter of water,we want to mixed sodium nirtride by 17% of the water,how much we used sodiume nitride in kilogram in to the water?
September 14, 2013 by imran

Chemistry
At 22C(Celsius) an excess amount of a generic metal hydroxide M(OH)2 is mixed with pure water. The resulting equilibrium solution has a pH of 10.14. What is the Ksp of the salt at 22C? Help Please
November 14, 2012 by Anonymous

Chemistry
If there were two solutions- one with areagent(100% pure) mixed in water and the other solution containing the same reagent (99.9% pure) mixed in equal volume of water. How significant would the difference in concentration be between these two solutions?
March 29, 2010 by Andrew

Gen. Chem
Could you help me with this homework please.. 105.0 g of water is in a Styrofoam calorimeter of negligible heat capacity. The initial T of the water is 17.1oC. After 288.2 g of an unknown compound at 77.0oC is added, the equilibrium T is 25.1oC. What is the specific heat of ...
March 25, 2013 by carl

science
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
March 31, 2013 by jeff

science
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
March 31, 2013 by jeff

science
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
March 31, 2013 by jeff

science
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
March 31, 2013 by jeff

university of calabar
A stoppered flask at 25 0C contains 250 ml water, 200 ml octanol, and 50 ml of air. An unknown amount of o-xylene is added to the flask and allowed to partition among the phases. After equilibrium has been established, 5.0 mg of o-xylene are measured in the water. What is the ...
March 27, 2014 by gift

Chemistry
I'm doing an Equivalent Weight and Normality experiment and I got very confused on the discussion questions.[ the unknown is titrated with the KMnO4] 1) In this experiment MnO4- is reduced to Mn2+ by the unknown. What is the equivalent weight of MnO4- for this experiment. ...
April 6, 2008 by Confused

science need help
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
April 1, 2013 by jeff

science need help
2 H2 + O2 = 2H2O 2 grams + 32 grams=_ _ _ _ _grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogeb that reacts. in your response be sure to: include they type of change illustrated in the balanced eqaution explain the conservation ...
April 1, 2013 by jeff

TIP manila
what happen when ethanol mixed in methanol. ethanol mixed in acetone. acetone mixed in methanol. methanol mixed in water.
September 22, 2011 by wew

Rounding to the nearest cent
What is $350.812 to the nearest cent? Is it a) $350.800 b) $350.812 c) $350.81 d) $350.82 e) None of the above
February 20, 2012 by Anonymous

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
Under identical conditions, separate samples of O2 and an unknown gas were allowed to effuse through identical membranes simultaneously. After a certain amount of time, it was found that 4.92 mL of O2 had passed through the membrane, but only 3.04 mL of of the unknown gas had ...
April 15, 2014 by Peter

Physics Homework
A 2000 lb box is being held at rest submerged in water. The box is displacing 2500 lbs of water. When the box is released from its submerged position, the box will a. sink b. rise to the surface and float c. remain where it is d. result unknown Ok, so if the box is put in the ...
November 13, 2010 by Jael

Physics - Buoyant Force
A piece of metal weighs 50.0 N in air, 36.0 N in water, an 41.0 N in an unknown liquid. Find the density of the unknown liquid.
December 16, 2008 by Phillip

Chemistry
A 0.750 g sample of an unknown solid is dissolved in 100 mL of water and acidfied with 25 mL of 3 M H2SO4 then titrated with a 0.0200 M KMnO4 solution. If the unknown solid requires 12.5 mL of the KMnO4 solution to reach the endpoint, what is the % sodium oxalate in the ...
April 9, 2013 by Aaron

Math
180 ml of a mixture of water and alcohol with 90% alcohol concentration is mixed with 70 ml of pure water. what is the alcohol concentration of the new mixture? Do the following: 1) Find out how many ml of alcohol was in the first mixture. (What is 90% of 180?) 2) Take that ...
April 21, 2007 by julia

College Chemistry
Plaster of Paris is the compound calcium sulfate hemihydrate, CaSO4*1/2H2O What mass of water is liberated when a 2.763 gram sample is heated to constant mass? The sample is 2.763 grams How much of the 2.763 gram sample is water? I need an amount in grams. Amount of anhyrdate...
October 8, 2011 by Roy

math(HELP)
PLEASE ANSWER THESE BEFORE I LOSE MY MIND !!! 19. What is the amount of sales tax owed on a $350 laptop computer if the tax rate is 6%? A.$2.10 B.$21.00 C.$35.00 D.$46.00 20. Find the amount of the discount on a $120 bicycle that is on sale for 25% off. A.$25.00 B.$30.00 C.$73...
February 10, 2014 by joc

Chemistry
A water solution containing an unknown quantity of an unknown nonelectrolyte solute has a freezing point of -0.21 Celsius. What is the molality of the solution? Kf=-1.86C/m
May 12, 2011 by Anonymous

Math
Nia and Trey both had a sore throat so their mom told them o gargle with warm salt water. -Nia mixed 12 teaspoon salt with 3 cups of water. -Trey mixed 12 teaspoons salt with 112 cups of water. Nia tasted Trey's salt water.She said," I added more salt so I expected that mine ...
September 3, 2013 by Jessica

Chemsitry
Calculate the molar mass of an unknown molecular compound mixed with solid camphor C10H16O, heated and then cooled giving the following data. show all steps in calculation. mass of unknown: 0.195 g Tf(camphor)= 179.8 degree C Kf(camphor)=-40.0 degree C/m mass of camphor-25.03g...
July 10, 2013 by Kelly

math
A supersoaker water pistol can hold up to 4 litres of water. If each shot uses 11/12 of amount of water of its previous shot, the amount of water fired by a fully loaded supersoaker's first shot is? x/4000ml=11/12 x=3666.7mL why is the answer 333mL?
January 9, 2010 by cyn

Science-Chemistry
1.)A sample of oxygen took 55 seconds to travel a certain distance. How long would it take for the same number of moles of nitrogen to travel the same distance. 2.) A sample of hydrogen gas traveled 45m in a given amount of time. An unknown gas traveled 7.6m in the same amount...
April 29, 2012 by Bryan

Chemistry- Please Help!!
Calculate the molar mass of an unknown molecular compound mixed with solid camphor C10H16O, heated and then cooled giving the following data. show all steps in calculation. mass of unknown: 0.195 g Tf(camphor)= 179.8 degree C Kf(camphor)=-40.0 degree C/m mass of camphor-25.03g...
July 10, 2013 by Kelly

Chemistry
In an experiment, 3.545 grams of an unknown nonelectrolyte is dissolved in 15.0 grams of water. The extrapolated freezing point is -.56 degrees C. What is the molecular weight of the unknown material?
November 22, 2010 by Cerra

Chemistry
At 20 degree celsius, Ka for an unknown monoprotic weak acid is 0.00088. Calculate the Delta G (in kJ/mol) for the reaction of this unknown acid with water. HA(aq) + H2O(l) <--> H3O+(aq) + A-(aq)
April 30, 2013 by Chloe

organic chem
7. An unknown compound, C8H14, is optically active. Hydrogenation of the unknown yields 4-methylheptane. Ozonolysis of the unknown yields ethanol and 2- methylpropandial. Suggest a structure for the unknown consistent with the above date. please help
October 11, 2010 by josh

Chemistry
1. Mass of flask, boiling chips, foil cap and unknown after cooling reaction 83.350g 2.Mass of flask, boiling chips,and foil cap. 82.657 3. water bath temperature C is 95.0 C 4. Barometric pressure inches of Hg 30.09 5. Accepted molar mass of unknown is 86.2g/moles 6. Volume ...
June 14, 2010 by Anonymous

Chemistry
Mass of flask, boiling chips, foil cap and unknown after cooling reaction 83.350g 2.Mass of flask, boiling chips,and foil cap. 82.657 3. water bath temperature C is 95.0 C 4. Barometric pressure inches of Hg 30.09 5. Accepted molar mass of unknown is 86.2g/moles 6. Volume of ...
June 14, 2010 by Anonymous

chemistry
an aqueous solution containing 17.5g of an unknown molecular(nonelectrolyte) compound in 100.0g of water has a freezing point of 1.8 degress C. calculate the molar mass of the unknown compound
November 5, 2011 by Monique

Chemistry
A 0.160-g sample of unknown metal (X) reacts with hydrochloric acid to produce 66.5 mL of "wet" gas at 20 C and 754 mm Hg. What is the unknown metal (X)? (The vapor pressure of water at 20 C is 18 mm Hg. Help please?
April 23, 2014 by Ally

Science
Working on the Amazon River, a biologist isolated DNA from two unknown organisms, P and Q. He discovered that the adenine content of P was 15% and the cytosine content of Q was 42%. This means that: a) the amount of guanine in P is 15% b) the amount of guanine and cytosine ...
October 26, 2010 by May

Chemistry
A 0.188g sample of unknown metal, X (s), produced 71.4 ml of hydrogen gas when reacted with HCL according to the equation: X(s)+2HCL(aq)--->XCl2(aq)+H2(g) The gas was collected over water at 23 degrees Celsius. The levels of water inside and outside the gas collecting tube ...
February 10, 2011 by K

Chemistry
80.0 grams of KBr is mixed with sufficient water to prepare 1865 mL of solution. This solution is then mixed with 46.3 mL of 0.425 M KCl solution. 12 mL of this mixture is subsequently added to 61.0 mL of distilled water. Calculate the molarity of K+ ions in the final mixture...
March 1, 2011 by Christian

Accounting
An estimated liability: 1. Is an unknown liability of a certain amount. 2. Is a known obligation of an uncertain amount that can be reasonably estimated. 3. Is a liability that may occur if a future event occurs. 4. Is not recorded until the amount is known for certain. (...
April 1, 2014 by Jessica

Chemistry
An aqueous solution containing 17.1 g of an unknown molecular compound ( nonelectrolyte) in 105.0g of water was found to have a freezing point of -1.8 degrees Celsius. What is the molar mass of the unknown compound?
December 6, 2013 by John

physics
In lab, Will burns a 0.6 g peanut beneath 48 g of water, which increases in temperature from 22 degree C to 55 degree C. The amount of heat absorbed by the water can be found with the equation Q =cm \Delta T, where Q is the amount of heat, c the specific heat of water, m the ...
March 31, 2012 by christy

science(chemistry) -Q for Dr.Bob
solvent layer: 1 solid precipitate: no I ran the solvent layer I got in my unknown in the GC and I had sharp peaks in the beginning but at about 4 min on the polar column, I got a broad peak that tailed off considerably. question is, Is it water? I'm not sure how water would ...
April 20, 2009 by ~christina~

chemistry
1. Mass of flask, boiling chips, foil cap and unknown after cooling reaction 83.350g 2. Mass of flask, boiling chips and foil cap. 82.657 3. water bath temperature C 95.0 C 4. Barometric pressure in Hg 30.09 5. Accepted molar mass of unknown 86.2g/moles 6. Volume of flask 270 ...
June 14, 2010 by Patty

Chemistry. please help
A 0.12 g sample of unknown was placed in a flask and dissolved in 125 mL of deionized water. A solution of HCl (0.10 M) was used to titrate the sample, and 18 mL was required to reach the endpoint. What is the formula weight of the unknown?
December 8, 2010 by Stephanie

Chemistry
If a piece of metal at -20 degrees Celsius is added to an ice and water mixutre in equilibrium at 0 degrees Celsius, which of the following statements is true??? ( Note more than one can be correct) I. the amount of ice will increase II. the amount of water will decrease III. ...
April 22, 2007 by John

Chemistry
If a piece of metal at -20 degrees Celsius is added to an ice and water mixutre in equilibrium at 0 degrees Celsius, which of the following statements is true??? ( Note more than one can be correct) I. the amount of ice will increase II. the amount of water will decrease III. ...
April 22, 2007 by John

math
a vase in the shape of a cube has a side measuring of 7 inches which of the numbers below is the best estimate of how much water it will hold? a 125 in3 b 200 in3 B 200 in3 c 300 in3 d 350 in3 d 350 in3
February 28, 2008 by marquis

science
The volume of a 500 g sealed packet is 350 cm cube . Will the packet float or sink in water if density of water is 1 g cm raised to -3 ? What will be the mass of water displaced by this packet ?
October 11, 2012 by ujjval

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