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May 29, 2016

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chemistry
Make a buffer solution with the following specification pH=5.5 Volume=2L total concentration=1M ... a) Name the components?... b) How many grams of each component would you use to make 2L of solution
July 25, 2011 by Anonymous

chemistry
What is the molarity of a salt solution in which 117.0 grams of salt (NaCl) is dissolved in water to give 5.00 L of solution? Show all work including units.
August 23, 2011 by len

chemistry
What is the molarity of a solution containing 8 grams of solute in 500 mL of solution? Round to the nearest hundredth. Don't forget the unit! (gram formula mass of solute = 24 g)
September 30, 2011 by archie

chemistry
What is the molarity of a solution containing 8 grams of solute in 500 mL of solution? Round to the nearest hundredth. Don't forget the unit! (gram formula mass of solute = 24 g)
September 30, 2011 by archie

chemistry
what is the molarity of a solution prepared by dissolving 2.24 grams of NaOH in enough deionized water to obtain 500.0ml of solution?The molar mass of NaOH is 40.0g
October 30, 2011 by denis

chemistry
what is the molarity of a solution prepared by dissolving 2.24 grams of NaOH in enough deionized water to obtain 500.0ml of solution?The molar mass of NaOH is 40.0g
October 31, 2011 by denis

Chemistry
For the following Reaction: 2AgNO3 + CaBr2 = 2AgBr + CaN2O6 If a chemist starts with 12.0g AgNO3, how many grams of CaBr2 must be added to use up all of the AgNO3?
November 14, 2011 by Carrie

Chemistry
You have an unlimited amount of 12M HCl stock solution. You need to neutralize 2.00 grams of NaOH by slowly adding 0.100M HCl solution.
November 25, 2011 by Shelby

Chemistry
How many grams of water are needed to dissolve 27.8g of NH4NO3 (80.0 g/mol) in order to prepare a 0.452 m (molal) solution? 27.8g / 80g/mol X 0.452 = 0.157 Is this correct?
February 12, 2012 by Hannah

chemistry
How many grams of oxygen are collected in a reaction where 245 mL of oxygen gas is collected over water at a temperature of 25 ^\circ {\rm C} and a total pressure of 688 torr
April 29, 2012 by raul

Chemistry
It requires 37.0 mL of a sodium hydroxide soltution to neutralize 0.75 grams of phosphoric acid. Using a balanced equation, determine the concentration of the sodium hydroxide solution.
May 21, 2012 by Leah

chemistry (organic)
Iodobenzee steam distills at 98.2C. How many molecules of water are required to carry over 1 molecule of iodobenzene? How many grams of water per gram of iodobenzene?
October 31, 2012 by rhurley

Chemistry
The combustion of how many moles of ethane would be required to heat 838 grams of water from 25.0 to 93.0 degrees C? Assume liquid water is formed during the combustion.
November 2, 2012 by k

chemistry
2 Al + 3 S --> Al2S3 In an experiment 10.0 g Al is combined with 15.0 g S. If the reaction continues until one reactant is totally consumed, which reactant would be in excess and how many grams would be unreacted?
November 4, 2012 by Sheree'

math
During the dinner rush, a certain restaurant cooks about 25 pounds of spaghetti per hour. How many grams of spaghetti do they cook per second?
January 14, 2013 by Marco

math
the bridge was built, the wood contained 15 grams of carbon-14. How much carbon- 14 would it have contained when it was found by the archaeologists? Round to the nearest hundredth
January 28, 2013 by Tran

ap chemistry
We observe that 5 grams of a gaseous com- pound occupies 1526 mL at 49C and 672 torr. What is the molecular weight of the com- pound? Answer in units of g/mol
February 9, 2013 by cheri

chemistry
Pure water has a density of 1.00 g/ml at 297 . Calculate the molar concentration of pure water at this temperature. Would i just convert grams to moles, and ml to liters?
March 28, 2013 by K

math
The function g(x)= x/453.6 converts x grams to pounds, as shown. Which composite function expresses the number of pounds that can be lifted by a balloon containing x ft3 of air?
April 7, 2013 by Anonymous

Chemistry
* Fixed Question What is the PH of a buffer made by adding 8.20 grams of sodium acetate(NaCH3CO2) to 500 ml of 0.10 M(molarity) acetic acid(CH3CO2H). Ka for acetic acid is 1.8 x 10^-5.
April 14, 2013 by Lele

Chemistry
A saturated solution of potassium nitrate in water is prepared at 70.0*C then cooled to 55.0*C how many grams of potassium nitrate crystallized--- how do I determine this using my graph with everyone's numbers
May 8, 2013 by Melissa

Chemistry
If a 0.875 gnsample of barium chloride is dissolved in water and then treated with a sodium sulfate solution, how many grams of barium sulfate precipitate should be collected?
July 29, 2013 by Colby

physics
How much heat ( In calories)is needed to warm 200 grams of water from an initial temperature of 24 degrees celsits to a final temperature of 84 degrees celsuis
September 24, 2013 by teresa

chemistry
What is the percent recovery if you begin with 0.482 grams of copper and recover 0.325 g? Include one decimal place in the answer and do not include the % sign. Answer
February 5, 2014 by cece

chemistry
The directions state "weigh about 5 grams of sodium chloride". Give minimum and maximum amounts of sodium chloride that would satisfy these instructions.
February 11, 2014 by Rachel

chem090
100.0 g of Potassium Phosphate reacts with 100.0 g of Barium Chloride. Which molecule is completely used up by the reaction? How many grams of the other molecule are left over?
April 8, 2014 by Jenny

Chemistry
A 1.0 liter flask is filled with a mixture of two gases at 20. oC until a pressure of 14.43 atm is established. If 0.40 grams of the mixture is hydrogen, how many moles are there of the other gases?
April 18, 2014 by Carrie Boom

analytical chemistry
Determine the concentration of iron in an aqueous solution containing 0.2810 grams of Fe(NH4)2(SO4)2 per liter of solution. Express the concentration in mg/dl.
June 15, 2014 by jenine

math
chemistry experiment needed 12.45 grams of chemical to produce one liter of a gas. If Zoe wanted 24 liters of gas, how many kilograms of the chemical will she need?
October 24, 2014 by shantelle

Chemistry
In the combustion of natural gas according to the equation CH4 + 2 O2 -> CO2 +2 H20, how many grams of water are formed during the combustion of 0.264 mole of CH4?
October 26, 2014 by Andrew

Science
What is the molarity (moles per liter) of a solution in which 80 grams of sodium hydroxide, NaOH, is dissolved in 1 liter of solution? How do I convert the 80grams into mols?
October 29, 2014 by Lilly

Chemistry
Consider the reaction between acetylene, C2H2, and oxygen in a welding torch: If 5.4 moles of acetylene react with sufficient oxygen, how many grams of CO2 will be formed?
April 6, 2015 by Angie

Chemistry
A flask contains 25.0 mL of diethyl ether weighth 18.74 g (micrograms). What is the density of the diethyl ether and grams per liter? I'm not sure how to set this problem up correctly.
May 1, 2015 by Sara

Chemistry
Calculate the volume of solution of 3.6 M NH4CI needed to prepare 350.0ml of 1.24 M NH4CI. How many grams of ammonium chloride are in the solution you created in the above problem.
June 7, 2015 by Donna

Chemistry
I have to prepare 1ppm of Fe+2 solution in 1litre. How many grams of ferrous ammonium sulphate will be dissolved in 1litre to make above solution.. plzz guide me
October 31, 2015 by Syed

Chemistry 101
A piece of metal weighing 10.65 grams releases 3450 joules of heat energy when it is cooled from 99.9c to 28.5c. Wheat is the specific heat capacity of the metal in J/g c..
January 28, 2016 by Lilly

chemistry
If a solution containing 22.34 g of mercury(II) perchlorate is allowed to react completely with a solution containing 6.256 g of sodium sulfate, how many grams of solid precipitate will be formed?
February 14, 2016 by alex

Chemistry
If a mothball (C10H8) has a mass of 1.32 grams, how many naphthalene molecules does it contain? If I'm right just multiply 1.32g by 6.022*10^23 and the answer is 7.949*10^23 molecules. Is this right?
March 23, 2016 by Karisa (Check Answer)

chemistry
3. How many grams of CaCO3 are required in the preparation of exactly 73.5 g of CO2? ---CaCO3> ---CaO + ---CO2
February 29, 2008 by anon

chemistry
how many grams of copper hydroxide can b prepared from 2.7g of copper (II) nitrate and excess sodium hydroxide?
March 23, 2010 by sophie

chemistry
how many grams of copper hydroxide can b prepared from 2.7g of copper (II) nitrate and excess sodium hydroxide?
March 23, 2010 by sophie

chemistry
you have 23- grams sample of ethanol with a density of 0.7893g/ml what volume of ethanol do you have?
September 27, 2010 by trice

chemistry
HOW DO I FIGURE CONVERSIONS. I HAVE 100GRAMS OF A METAL AND 18% OF THAT IS NICKEL. HOW MANY GRAMS OF NICKEL DO I HAVE?
October 4, 2010 by SOL

chemistry
how many grams of sodium chloride do you need to prepare 250 mL of a 5.00% sodium chloride solution?
October 24, 2010 by Anonymous

La Salle
How many grams of sodium chloride do you need to prepare 250 mL of a 5.00% (w/v) sodium chloride solution?
October 25, 2010 by Jackie

chemistry
How many grams of sodium chloride do you need to prepare 250 mL of a 5.00%(w/v) sodium chloride solution
March 10, 2011 by NeeNee

chemistry
How would you prepare 1 L of a 1.15 M aqueous solution of MgCl2? What grams of MgCl2 would be used?
June 15, 2011 by Anonymous

science
if the concentration of lead in water is 15ppm how much water contains 15 grams of lead?
June 15, 2011 by Anonymous

applying stoichiometry
nitrogen + hydrogen----------> ammonia How many grams of ammonia can produced from 3.47 moles of hydrogen?
February 5, 2012 by danielle

Chemistry
If 62.7 ml of .208M HCL is needed to needed to neutralize a solution of Ca(OH)2, how many grams of Ca(OH)2 must be in the solution?
February 26, 2012 by Arianna

Chemistry
The solubility of NH4CL is 50g/100g of water at 50C. How many grams of NH4CL will dissolve in 20 g of water?
April 27, 2012 by Ay3

chemistry
water is 88.8% by mass oxygen. How many grams of water would contain 2.25kg of oxygen?
September 1, 2012 by rachel

chemistry
When 14 grams of a sample cools from 59C to 27.8C it loses 20.9 Joules of heat. What is the specific heat of the sample?
September 20, 2012 by Opal

algebra
how many grams of 2.5% hydrocortisone cream should be mived with 360 g of 0.25 to make a 1% hydrocortisone cream
June 2, 2013 by brenda

chemistry
When 30.0g of aluminum reacts with HCl, how many grams of aluminum chloride are formed? Al + HCl --> AlCl3 + H2
July 15, 2013 by paula

chemistry
what is the latent heat of silver metal if 55.0 grams of metal liquefies with 47.3J of heat added?
March 9, 2014 by Anonymous

chemistry
if you need 50.0 grams of lead2 chloride how much magnesium chloride would you need?
July 9, 2014 by brooke

Chemistry
To make 250 ml of a 5%(w/v) calcium carbonate solution, how many grams of calcium carbonate will I need?
November 29, 2014 by Chris

math
How many grams of water are needed to reduce 100g of a 30% acid solution to a 10% acid solution?
May 20, 2016 by PLEASE HELP :)

Chemistry
Question: How many grams of AgI can be dissolved in 150.0 mL of a solution that initially contains NaCn at a concentratoin of .440 M? Would the equation be Ag(Cn)2 -> Ag+ 2CN? What numbers go into what place in the ice table. does the .440 M of CN get squared?
May 11, 2009 by Anonymous

Chemistry
What will the graph look like when the relationship of the number of grams of solute that a soluution is 50grams of H2O at varying temp, if the solubility begins at a small quantity and increases in direct proportion the increase in temp? Thank you!
June 3, 2009 by Anonymous

Chemistry
If 0.870 mol of liquid Br2 and 720 mL of 0.958 M aqueous NaI are reacted stoichiometrically according to the balanced equation, how many grams of solid I2 are produced? 2NaI(aq) + Br2(l) → 2NaBr(aq) + I2(s) help please. :)
February 23, 2010 by Keri

Chemistry
Fe + 2HCl = FeCl2 + H2 A piece of metallic iron (10 moles) was dissolved in concentrated hydrochloric acid. The reaction formed hydrogen gas and iron chloride. How many grams of HCl were consumed? Don't forget the units.
June 27, 2010 by Liz

Chemistry
A piece of metallic iron (10 moles) was dissolved in concentrated hydrochloric acid. The reaction formed hydrogen gas and iron chloride. How many grams of HCl were consumed? Don't forget the units. Fe+2HCl---->FeCl2+H2
August 5, 2010 by Meladee

conversion problems
Im not sure how to convert these because of the cm cubed heres the question: An aluminum engine block has a volume of 4.88 L and a mass of 12.60 kg. What is the density of the aluminum in grams per cubic centimeter? so its gonna be something g/cm3 can you tell me what it is ...
August 25, 2010 by Hannah

Chemistry
A 50.0 mL sample of 0.200 M AgNO3(aq) was allowed to react with an excess of NaCl(aq). The AgCl precipitate from the reaction was carefully dried and weighed. How many grams of precipitate should be obtained? I'm currently stuck and need help asap!!
September 27, 2010 by Diggs

chem-repost
How many grams of magnesium oxide are formed when 13.5 L of oxygen gas, measured at STP, completely reacts with magnesium metal according to the following reaction? i got .496 g but i know that like way off
February 17, 2011 by hannah

Chemistry
Thank you very much for your assistance preemptively. My question has to do with law of conservation of mass. A 50g sample of iron reacts with 21g of oxygen to from how many grams of iron oxide? Is the answer maybe 71g or 29g. This is stumping me.
September 3, 2011 by ben

chemistry
How many grams of ethanol must be added to 500.0 g of water to make a solution that freezes at 0.00 degrees fahrenheit? The molal freezing point depression constant for water is 1.86 degree celsius over moles.
March 9, 2012 by Renee

Chemistry
If there were 197g of sulfuric acid in your car battery, how many grams of baking soda would you need to completely neutralize the acid. Here is the balanced equation: H2SO4(aq) + NaHCO3(s)....NaSO4(aq) + 2CO2(g) + 2H20(l)
October 21, 2012 by Courtney

math
A balance scale is perfectly balanced with two blocks on one side and ten weights on the other. If each weight equals 2.0 grams, how much does one block weigh? Please answer and explain.
March 14, 2013 by Anonymous

Chem 130
What mas of liquid mercury should be produced by the reaction between 5.0 mL of 0.1102 M mercury(II)nitrate ans 0.621 grams of silver metal? would the formula be... Hg(NO3)2(aq) + 2Ag(aq)--> 2AgNO3(aq) + Hg(l)
November 11, 2014 by michelle

chemistry
Hydroxyapatite is the main mineral component of bone. How many grams of hydroxyapatite will dissolve in 1.00 L of H2O? Ksp = 2.34 1059; Molar mass = 502.3 g/mol? I keep getting 5.83x10^-18 g but the answer is supposed to be 4.35x10^-5 g. I don't understand why
March 29, 2015 by paula

chemistry
A square piece of paper measuring 4.8 inches on a side is weighed and found to have a mass of 1.5 grams. How many pounds would exactly 500. sheets of this paper weigh, given that each page measures 21.50 cm by 27.73 cm?
September 4, 2015 by asd

AP Chemistry
This questions has 5 parts but I already have the answers for a and b. I need help on the last three parts. In an electrolytic cell, a current of 0.250 ampere is passed through a solution of a chloride of iron producing Fe(s) and Cl2(g). a) write the equation fot he half-...
April 24, 2007 by anonymous

Chemistry!
10.2 g of Pb(NO3)2 are dissolved in 100 mL of water, and added to 250.0 mL of a 0.250 M solution of KI. Determine the mass in grams of Pbl2 produced, and find the number of moles of the excess reagent. PLZ explain chemistry - DrBob222, Monday, December 13, 2010 at 4:30pm...
December 14, 2010 by jenni

AP Chemistry
A mixture of aluminum and zinc metal is used in 2 experiments described below: A- A 1.7 gram sample of the mixture is reacted with excess hydrochloric acid and the resulting hydrogen gas is collected over water. The reaction takes place at 750 mm Hg atmospheric pressure and ...
April 3, 2011 by Kate

Physics
An apartment has a living room whose dimensions are 2.5 m 4.8 m 5.9 m. Assume that the air in the room is composed of 79% nitrogen (N2) and 21% oxygen (O2). At a temperature of 27C and a pressure of 1.01 105 Pa, what is the mass (in grams) of the air? g
April 19, 2008 by Pierre

physics
An apartment has a living room whose dimensions are 2.5 m 4.8 m 5.9 m. Assume that the air in the room is composed of 79% nitrogen (N2) and 21% oxygen (O2). At a temperature of 27C and a pressure of 1.01 105 Pa, what is the mass (in grams) of the air?
April 26, 2008 by mike

Physics
An apartment has a living room whose dimensions are 2.5 m 4.8 m 5.9 m. Assume that the air in the room is composed of 79% nitrogen (N2) and 21% oxygen (O2). At a temperature of 27C and a pressure of 1.01 105 Pa, what is the mass (in grams) of the air?
April 28, 2008 by Tasha

ap chemistry
A star is estimated to have a mass of 2 X 10^36 kg. Assuming it to be a sphere of average radius 7.o X 10^5 km. Calculate the average density of the star in units of grams per cubic centimeter
July 5, 2010 by wesley

chemistry
a scientist wants to make a solution of tribasic sodium phosphate ,Na3PO4, for an experiment. how many grams of Na3PO4 will be needed to produce 750 mL of a solution that has a concentration of Na+ ions of 1.30M
March 14, 2010 by kathryn

calculus
Assume a substance has a half-life of 11 years and the initial amount is 144 grams. How much remains at the end of 5 years? How long will it be until only 30 % remains?
September 14, 2010 by nick

chemistry
A scientist wants to make a solution of tribasic sodium phosphate, \rm Na_3PO_4, for a laboratory experiment. How many grams of \rm Na_3PO_4 will be needed to produce 575 mL of a solution that has a concentration of \rm Na^+ ions of 1.00 \it M?
September 19, 2010 by kim

chemistry
A scientist wants to make a solution of tribasic sodium phosphate, \rm Na_3PO_4, for a laboratory experiment. How many grams of \rm Na_3PO_4 will be needed to produce 575 mL of a solution that has a concentration of \rm Na^+ ions of 1.00 \it M?
September 19, 2010 by kim

Chemistry
Calculate the solubility of LaF3 in grams per liter in the following solutions. The Ksp of LaF3 is 2.01 e-19. (a) pure water (b) 0.051 M KF solution (c) 0.065 M LaCl3 solution
October 1, 2010 by Tiffany

Chemisty
How many grams of ice at -6.1C can be completely converted to liquid at 27.4C if the available heat for this process is 4.6010^3 kJ ? For ice, use a specific heat of 2.01J/(g*C) and traingle Hfus = 6.01kJ/mol.
November 5, 2010 by Anonymous

chemistry
if 5liters of hydrogen iodide gas is bubbled through 2 liters of 0.0275 M lead 2 nitrate solution at STP, how many grams of lead 2 iodide will precipitate out?
January 6, 2011 by jess

Chemistry
If 0.630 grams of HNO3 (molecular weight 63.0) are placed in 1 liter of distilled water at 25 degrees C, what will be the pH of the solution? (Assume that the volume of the solution is unchanged by the addition of the HNO3.) A. 0.01 B. 0.1 C. 1 D. 2 E. 3
January 24, 2011 by Sharon

Math
A thin lead apron is used in dental offices to protect patients from harmful X rays. If the sheet measures 75.0 cm by 55.0 cm by 0.10 cm, and the density of lead is 11.3 g/ cm, what is the mass of the apron in grams?
August 30, 2011 by Monique

Chemistry
50 mL of a 2.5 M solution of ammonium phosphate is added to 100 mL of 1.5 M solution of calcium nitrate. At the end of the reaction 11.2 grams of solid product were obtained. Whats the % yield of this reaction?
April 17, 2011 by Hillary

Chemistry
The density of aluminum is 2.70g/cm3. If a cube of aluminum weighs 13.5 grams whatis the length of the edge of the cube. I need help with the formula to figure this one out.
June 1, 2011 by Jessica

chemistry
Use the following balanced equation. 3Sr(OH)2 + 2H3PO4 --> 6H20 + Sr3(PO4)2 How many grams of Sr3(PO4)2 could be produced by the complete reaction of 200 mL of 0.40 M H3PO4?
June 20, 2011 by Brea

chemistry
A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 400 mL of a solution that has a concentration of Na+ ions of 1.00 M?
October 13, 2011 by Colin

chemistry
A radioactive sample contains 2.45g of an isotope wiht a half life of 3.8 days. How much of the isotope in grams remains after 11.4 days? please explain
November 26, 2011 by Monique

chemistry
A 100.0 gram sample of iron at 80.0 degrees Celsius was placed in 150 grams of water at 20.5 degrees Celsius. What was the final temperature when thermal equilibrium was reached?
January 31, 2012 by tom

Chemistry 101
if 95j of heat is added to a pure gold coin with a mass of 16 grams, what is its temperature change? Specific heat capacity of gold is 0.128 j/g degrees C.
February 24, 2012 by Haley

Chemistry
500ml of 0.250M Na2SO4 solution is added to an aqueous solution of 15.00 g of BaCl2 resulting in the formation of white precipitate of BaSO4. How many moles and how many grams of BaSO4 are formed?
August 9, 2012 by Natasha

physical science
how much heat is absorbed by pouring 10 grams of 100 degree C liquid water on a students hand. The water is cooled to body temperature 37 degree C
October 22, 2012 by Anon

math
A material has a half-life of 12 hours. If initially there are 4 grams of the material, how much is present after 8 hours? I know the answer is 8/3, but how would you solve this using calculus? please help.
November 11, 2012 by alex

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