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November 23, 2014

Search: 14 carat gold has a purity of 58.3%. How many moles of gold are in 154 grams of 14 carat gold? Answer in

Number of results: 11,264

Chemistry
The problem on my homework is: What mass in grams of iron metal is required to react with 2.50 L of .1500 M of sulfuric acid to produce 18.35g of iron (III) sulfate? please help!
May 23, 2010 by Lauren

Chemistry
Calculate the mass in grams of hydrgen chloride produced when 5.85 L of molecular hydrogen measured at STP reacts with an excess of molecular chlorine gas. H2 + Cl2 ---> 2HCl
June 20, 2010 by Anonymous

Chemistry
Please help I am 11 and lost.y question is a piece of tungsten has a volume of 5.2cubic centimeters and and mass of 100 grams. What is the density of tungsten? I am in sped class don't understand how to solve it.
September 27, 2010 by Alex

Chemistry
Calculate the molarity of a solution made by dissolving 0.680 grams of Na2SO4 in enough water to form exactly 940 mL of solution. Please show me how to solve
October 7, 2010 by Veronica

Chemistry
A mixture of gases collected over water at 14C has a total pressure of 1.198 atm and occupies 72 mL. How many grams of water escaped into the vapor phase?
October 15, 2010 by Megan

science
How much heat is absorbed by a persons hand if 100 grams of steam at 100c is first converted to liquid at 100c and then cooled to normal body temperature?
October 17, 2010 by Alley

chemistry
Find the mass of sodium hydroxide needed to neutralize enough nitric acid to create 2.0 grams of sodium nitrate? How do I write out equation and solve?
November 30, 2010 by Tosha

chem
can you explain? For each of the reactions shown, calculate how many grams of the product form when 16.8 g of the reactant in bold completely reacts. Assume that there is more than enough of the other reactant. 4 Cr(s) + 3 O2(g) 2 Cr2O3(s) thanks
December 6, 2010 by hannah

chemistry
A 150.0 mL flask contains 0.391 grams of a volatile oxide of sulfur. The pressure in the flask is 750 mmHg and the temperature is 22C. Is the gas SO2 or SO3?
March 14, 2011 by Rachel

chemistry
The combustion of propane (C3H8)produces CO2 and H20: C3H8(g)+5O2(g) 3CO2(g)+4H2O(g) Calculate the mass, in grams, of H2O that will be produced if 2.5 mol of O2 is consumed.
March 16, 2011 by michelle

chemistry
The combustion of propane (C3H8)produces CO2 and H20: C3H8(g)+5O2(g) 3CO2(g)+4H2O(g) Calculate the mass, in grams, of H2O that will be produced if 2.5 mol of O2 is consumed.
March 16, 2011 by michelle

prep chem
How many milliliters of oxygen 2(g) will be produced at 720mmHg and 17 celsius if 0.460 grams of KClO3 are reacted in the reaction? Formula is 2 KClO3 --> 2 KCl + 3 O2(g) I know to change temp into K
April 18, 2011 by Laura

Integrated Physics and Chemistry
How many calories are absorbed by a copper spoon with a mass of 200 grams as it changes from 28°C to 33°C? A) 0.00027 B) 3 C) 90 D) 13,000 And this one. How do i solve this one?
June 21, 2011 by Destiny

math
From the Periodic Table, 1 mole of aluminum weighs 27.0 g., Therefore; If 54.0 g of aluminum are placed into the beaker to react with copper(II) chloride, how many grams of the metal product will be produced?
January 12, 2012 by chris

chemistry
a human being requires 2700Kcal of energy per day.if the enthalpy of combustion of glucose is -1350Kcal/mol.how many grams of glucose a person has to consume everyday?
February 15, 2012 by werksow

Chemistry
What mass of sodium chloride is produced when chlorine gas reacts with 0.29 grams of sodium iodide? Unbalanced equation is given below: NaI + Cl2 -> NaCl + I2
April 10, 2012 by Halie

chem 1046
Calculate the solubility (in grams per 1.00 102 mL of solution) of magnesium hydroxide in a solution buffered at pH = 9. Enter your answer to 2 significant figures.) Ksp = 2.06e-13
July 9, 2012 by Anonymous

chemistry
Aluminum metal is exposed to atmospheric oxygen, it is oxidized to form aluminum oxide. How much heat is released by the complete oxidation of 24.2 grams of aluminium at 25C and 1atm.
October 13, 2012 by Diana

college chemistry
How many gram of Zn would be necessary to produce 534 grams of Fe by the sequence of reactions shown below? Step 1 Zn + HCl ==> ZnCl2 + H2 Step 2 Fe2O3 + H2 ==> Fe + H2O
October 23, 2012 by ursula

CHM
How many milliliters of a 0.25 M sucrose solution contain 2.0 grams? The molar mass of sucrose (C12H22O11 ) is 342.3 g/mol. Need the formula to understand how to continue with more problems.
November 19, 2012 by V

Chemistry Help
Using the accurate concentration that you measured in Part A (which is 14.77 ml), calculate the mass of HCl (in grams) present in a 15.00-mL sample of the acid solution, using proper dimensional analysis
December 2, 2012 by Alex

Physical Science- Help Please!
Suppose that you are given a 100 gram sample of a radioactive substance with a half-life of 32 days. How many grams will be left after 192 days?
December 5, 2012 by Molly

ap chemistry
What amount of energy is required to com- pletely ionize 26.9 grams of carbon atoms in the gas phase (C(g)) if the ionization energy of C(g) is 1086 kJ/mole? Answer in units of J
April 15, 2013 by cheri

chemistry
This balance equation shows the burning of octane in air. 2C8H18 + 25O2 ----> 16CO2 + 18H2O. How many grams of carbondioxide will be produced when 1 mole of octane burns completely?
August 8, 2013 by Shane

chemistry
How many milliliters of a 0.5 molar HCl solution are needed to react completely with 15 grams of zinc according to the following equation? ? HCl+? Zn→? ZnCl2 +? H2 Answer in units of mL
October 28, 2013 by Anonymous

chemistry
How many milliliters of a 0.5 molar HCl solution are needed to react completely with 15 grams of zinc according to the following equation? ? HCl+? Zn→? ZnCl2 +? H2 Answer in units of mL
October 28, 2013 by Anonymous

chemistry
Answer the question(s) below about the following reaction. 2H2O2 (l) → 2H2O(g) + O2(g) If 50.0 grams hydrogen peroxide produce 15.0 g oxygen, what is the percent yield for this reaction?
November 8, 2013 by Anonymous

chemistry
2NiS2(s)+5O2(g)=2NiO(s)+4SO2(g) 1. how many kilograms of NiO would be formed from the reaction of .0125 mol of NiS2? 2. How many grams of O2 are needed to cmpletely react with 3.74 g of NiS2.
September 27, 2014 by newsome

chemistry
If 890 mL of 0.236 M aqueous NaI and 0.560 mol of liquid Br2 are reacted stoichiometrically according to the? If 890 mL of 0.236 M aqueous NaI and 0.560 mol of liquid Br2 are reacted stoichiometrically according to the balanced equation, how many moles of liquid Br2 remain? ...
June 6, 2010 by Judy

Chemistry
Givien a 2.0kg solution of phosphoric acid and water 53% phosphoric acid by mass calculate the number of moles of phosphoric acid
October 14, 2011 by Anonymous

Chemistry
Givien a 2.0kg solution of phosphoric acid and water 53% phosphoric acid by mass calculate the number of moles of phosphoric acid
October 14, 2011 by Anonymous

us history
Why were the British more successful than the Spanish in colonizing North America? Select one: a. They found more gold. b. They had a stronger military. c. They attracted more immigrants. d. They bonded with Native American populations. On the heels of repealing the Stamp Act...
September 28, 2013 by john

college Chemistry
Write a balanced equation for the dissolution of sodium carbonate (Na2CO3) in water. Find the number of moles of Na+ produced when 0.318 mol of sodium carbonate dissolves. Answer in units of mol.
January 24, 2009 by guy

Physics PLEASE HELP!
How many molecules are there in 0.029 moles of carbon dioxide gas, CO2? I asked this today, and the person told me to do 0.029 * 6.022e23 and my answer was wrong :/ Can someone please tell me what my answer should be!!?
June 20, 2012 by Natalie

Chemistry
1 ml of 8.675x10^-3 M sodium salicylate was dispensed in a 100 ml volumetric flask, It was diluted to 100ml mark with acidified 0.02 M Iron (III) Chloride solution. What is the number of moles of Iron (III) Salicylate complex?
November 19, 2012 by Emma

Science (Chemistry)
A student mixes 35.0 mL of 2.82 M Pb(NO3)2(aq) with 20.0 mL of 0.00221 M Na2C2O4(aq). How many moles of PbC2O4(s) precipitate from the resulting solution? What are the values of [Pb2 ], [C2O42], [NO3], and [Na ] after the solution has reached equilibrium at 25 C? Ksp(PbC2O4...
February 2, 2014 by Anon

Science (Chemistry)
A student mixes 35.0 mL of 2.82 M Pb(NO3)2(aq) with 20.0 mL of 0.00221 M Na2C2O4(aq). How many moles of PbC2O4(s) precipitate from the resulting solution? What are the values of [Pb2 ], [C2O42], [NO3], and [Na ] after the solution has reached equilibrium at 25 C? Ksp(PbC2O4...
February 2, 2014 by Anon

chemistry
how many grams of H2 (g) are produced by the reaction of 1.35 g Al with 75.0 mL of 3.44 M HCl Here is the way to do most of these stoichiometry/limiting reagent type problems. Step 1. Write a balanced chemical equation. 2Al + 6HCl ==? 3H2 + 2AlCl3 Step 2. Convert what you have...
September 24, 2006 by brian

Science
Which is the best unit for measuring each mass? mg = milligrams g = grams kg = kilograms a. Amount of spices in a batch of cookies: mg g kg b. Your mass: mg g kg c. Mass of 10 pennies: mg g kg
September 2, 2007 by Sonic

Chemistry
Hydrogen gas, , reacts with nitrogen gas, , to form ammonia gas, , according to the equation 3H2+N2-2NH3 How many grams of can be produced from 2.90 of ?
October 5, 2009 by Rose

Organic Chemistry
A student tried to dissolve 5.0 grams of impure acetanilide in 50 Ml of hot water. However was not able to get it to dissolve. Why not? What would you do to get it to dissolve??
April 14, 2010 by Stephanie

chemistry
when a 0.4-g almond sample is burned the heat gained by the water is 7525.4 J and the temperature of the water increased from 24 C to 58 C what was the mass of the water in grams? a. 50 b. 100 c. 45 d. 52.9
May 10, 2010 by shannon

Chemistry
A 5.00 gram mixture of CaO and CaO3 is heated strongly. After heating, the mixture it has a mass of 4.00 grams. What % of the original mixture is CaCo3?
December 9, 2010 by Paul

Science
If a block is 12cm wide, 7cm long and 9 cm then how much of the block will be below the surfaceof the water if the block weights 500 grams?
September 20, 2011 by Jen

chemistry
You have a compound that is subject to decay. If you originally started with 80 g of the compound and you ended up with 5 grams 30 days later, what is the half-life of the compound?
December 5, 2011 by Anonymous

science
A rectangular container measuring 28 cm 43 cm 58 cm is filled with water. What is the mass of this volume of water in kilograms and grams? (Take the density of water to be 1000 kg/m3.) kg g
April 20, 2012 by Anonymous

physics
Given that the mass of an electron is 9.1 x 10^-28 grams and the charge on an electron is 1.6 x 10^-19 Coulombs, calculate the voltage required to lift an electron 5 cm. not quite sure how to do this.
May 19, 2012 by Martin

Chemistry
the specific heat of water is 4.184 j/g c. How many grams of water at 85 C would have to be added to raise 1.00 kg of water from 25.0 C to 50.0 C? Please help I am not sure of where to start!
November 10, 2012 by Anonymous

Chemistry
A volume of 725 mL of a gas is collected at 105 degrees celcius and 746 torr. The gas sample wights 1.92 grams. What is this gas?
November 22, 2014 by Teresa

CHEMISTRY
1.0 mol of nitrogen oxide NO and 1.0 mol of oxygen were mixed in a container and heated to 450 oC. At equilibrium the number of moles of oxygen was found to be 0.70 mol. The total pressure in the vessel was 4.0 atm. Calculate the value of Kp for the reaction: 2NO (g) + O2 (g) ...
July 8, 2010 by jemy

world history
Give me suggestions on the Change over Time Essay, or Changes and Continuities Essay. I am more interested on the content and whether or not I covered the requirements. Below the essay is a rubric. Provide me tips on what to improve, expand, etc. Feel free to provide me some ...
December 13, 2007 by mimi

stat
AluminiCorp is a major producer of aluminum cans that produces 40 billion aluminum cans every year. You work as a quality control officer for AluminiCorp, and are responsible for ensuring that the aluminum cans produced meet certain specifications. Each can is supposed to ...
October 27, 2012 by Anonymous

Chem for final, please help!
How many moles of H+(aq) ions are present in 1.25 L of 0.75M Nitric Acid? A. 0.60 mol B. 0.75 mol C. 0.94 mol D. 1.7 mol E. 1.9 mol Please show me how to work this!
December 7, 2010 by lavonne

chemistry
how are moles and molarity related to volume? is it molx molarity or mol/molarity to get volume?
November 18, 2014 by jackson

chemistry
how many grams of BaO are in 1L of a 2.0 aqueous BaO solution (MW BaO = 153.3g/mole)?
April 26, 2011 by jackie1

chemistry
How many grams of are present in a solution if 38.60 of 0.145 solution is needed to titrate the solution?
October 2, 2012 by LaKeisha

Chemistry
A sealed flask containing 1.0 mole of H (g) and a sealed flask containing 2.0 moles of He(g) are at the same. 2 temperature. The two gases must have equal 1. masses 2. volumes 3. average kinetic energies 4. numbers of molecules
April 12, 2009 by .

Chemistry
A sealed flask containing 1.0 mole of H2(g) and a sealed flask containing 2.0 moles of He(g) are at the same temperature. The two gases must have equal 1. masses 2. volumes 3. average kinetic energies 4. numbers of molecules
April 12, 2009 by .

Chemistry
0.12 g of rock salt(NaCl and impurities) was dissolved in water and titrated with 0.1 M silver nitrate. 19.7 mL was required to titrate all the chloride ion. How many moles of sodium chloride were in the original sample and what percent of the sample are impurities?
March 26, 2010 by Mary

chemical principal
a chemist weidghed 1.25g of sodum hydroxide ,placed it in a volumetric flask and then added enough deionized water to bring the total volume to 250mL. How many moles of NaOH were added to the volumetric flask
November 2, 2010 by sue

Chemistry
A 21.2mL sample of 0.307M ammonia, NH3 is titrated with 0.259 M hydrobromic acid. What is the pH before the addition of any hydrobromic acid? I am not sure how to start this. I know I could completeit if I knew where to start. Would I set up a moles table?
April 18, 2012 by Hannah

General Chem
Nitrogen oxide reacts with oxygen gas to form nitrogen dioxide (NO2). In one experiment 0.866 mole of NO is mixed with 0.503 mole of O2. Calculate the number of moles of NO2 produced
October 12, 2012 by Alexis

ap chemistry
Carbon monoxide reacts with oxygen to form carbon dioxide by the following reaction: 2CO(g) + O2(g) ! 2CO2(g) H for this reaction is −135.28 kcal. If 811.7 kcal is released, how many moles of CO must have reacted?
October 31, 2012 by cheri

Chemistry
The coefficients of a balanced chemical equation indicate the relative number of _______ of the reactants and products. All stoichimetric calculations begin with a _______. Only ______ and ______ are conserved iin every reaction; moles, volumes, and representative particles ...
April 4, 2007 by Bryan

General Chemistry
According to the following reaction, how many moles of Fe(OH)2 CAN FORM FROM 175.0 mL of 0.227 M LiOH soultion? Assume that there is an excess of FeCl2 FeCl2(aq)+ 2 LiOH(aq)-(Oh)2(s)+2LiCl(aq) I have no clue how to approach this problem? Could anyone help me? I do not know ...
December 17, 2010 by Emily

Chemistry
you measure 5.3g of KOH and dissolve it in enough water to make 400 ml of solution. what is the molarity of this base? You want to neutralize this base with a 3.7M H2SO4. How much sulfuric acid is necessary to do this? x=5.3g/39+16+1 = 5.3/56=.095m M=moles/L of solution = .095...
April 5, 2011 by Jessica

Chemistry with Qualitative Analysis
Help please with Carbon analysis. An air bubble accidentallyy enter the CO2-collection graduated cylinder after the completion of the reaction. How does this error affect the reported moles of CO2(g) collected--too high, too low, or unaffected? Explain.
November 1, 2012 by EJ Nunez

General Chemistry
Calculate the number of C atoms, H atoms, and O atoms, in 1.50 grams of glucose (C6H1206). Please explain and exact example of how to do this and what the correct answers are.
May 17, 2010 by Kendra

chemistry
A solution is prepared by mixing 5.00 grams of compound Z (molar mass 15.00 g/mol) in 100.0 ml of water. The density of the solution is 1.09 g/ml. Calculate the molarity of the solution
January 27, 2011 by Angela

Chemistry 111
The heat of fusion for a solid is .825kJ/mole. the formula weight of the solid is 150.24. How many grams of this solid can be melted by 305J of energy?
April 13, 2011 by Janna

CHEMISTRY
Suppose 1400 J of heat energy are put into a sample of liquid water at 23C, and the final temperature of the water is 78C. How many grams of water are present?
April 16, 2012 by Sarah

Chem I
Ammonia is composed of H and N in a ratio of 9.33g N to 2.00g H. If 4.56g N combine completely with H to form ammonia, how many grams of ammonia would be formed? How do you calculate this?
September 2, 2012 by greg

Chemistry
When alcohol evaporates according to the equationC2H5OH(l) --> C2H5OH(g), how many liters of gaseous alcohol, measured at STP, are created by the evaporation of 566.1 grams of alcohol?
April 16, 2013 by Tif

chemistry
A piece of magnesium weighing 48 grams is burned in air n 80 gram of magnesium oxide is formed. what mass of oxygen combined with the magnesium is in the reaction?
March 23, 2014 by Rodney

chemistry
a student set up a reaction with 0.2905g of cholesterol and 0.13g of nonanoyl chloride in excess triethylamine, and collected 0.0244g of solid product. what is the actual yield (in grams) of cholesteryl nonanoate? explain how to do this please :)
October 29, 2011 by anna

Organic Chemistry
how many grams of ZnCl2 are needed to prepare 250 ml of an aqueous solution with an osmolarity equal to 0.300 osmol? I posted this question a few minutes ago, but forgot to add the last part of the sentence. Thanks!
March 6, 2012 by Jules

chem
If 34.2 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 299 Kelvin and 1.21 atmospheres? Show all of the work used to solve this problem. 2 Li (s) + 2 H2O (l) yields 2 LiOH (aq) + H2 (g)
February 19, 2014 by rae

Bio Chem
Carbonate is commonly used to buffer household detergent solutions to a pH of 9.0. How many grams on NaHCO3 and how many grans of NA2CO3 are needed to prepare 0.75L of a 100mM solution? The 2nd pKa of carbonic acid is 10.33.
September 4, 2014 by Cassandra

CHEM
Calculate the mass (in grams) of the product formed when 10.1g of the underlined reactant completely reacts. Assume that there is more than enough of the other reactant. 2K(s) + __Cl2(g)__ -> 2KCl(s) I cannot get the correct answer.
October 15, 2007 by K

Physical Science
The radius of a certain planet is 6.04x10^7 meters, and its mass is 5.19x10^26 kg. Find the density of this planet. (The volume of a sphere is given by (4/3)(pie)(r^3). Answer in units of grams/cm^3
February 3, 2008 by Christina

Chemistry
Caffeine C8H10N4O2, is a stimulant found in a tea and coffee. A sample of the substance was dissolved in 45.0g of choloroform CHCl3 to give a 0.0946m solution. How many grams of caffine were in the sample. m = molality
February 6, 2008 by Lauren

physics
If you weighed yourself on regular bathroom scale outside, then again inside the Empire State Building and inside your weigh about 350 grams less, why would this be?
November 7, 2008 by Lee

chemistry
A weather ballon with a 2 meter diameter at ambient temperature holds 525 grams of helium. what type of electric probe could be used to determine the pressure inside the ballon?
March 25, 2009 by sofia

chemistry
a weather balloon with a 2 meter diameter at ambiient tempatures holds 525 grams of helium. what type of electroniic probe could be used to determine the pressure inside the balloon
January 18, 2011 by eric

Honors Chemistry
N2+ 3H2--> 2NH3 How many grams of NH3 can be produced from the reaction of 28 g N2, and 25 g of H2?? I got 34g NH3 and 140 NH2 2. How much of the excess reagent in problem 1 is left over?
January 28, 2011 by Emelia

IPC
The specific heat capacity of aluminum is 0.22 cal/g°C. How much energy needs to flow into 20.0 grams of aluminum to change its temperature by 15°C? How do i set this problem up to solve it?
February 24, 2011 by Kaitlin

Chemistry
If 10.0 grams of sodium bicarbonate reacts with 50.0mL of 2M acetic acid, what is the limiting reactant? what reactant is in excess, and by how much? What volume of carbon dioxide gas would form?
March 10, 2011 by Alexandra

Chemistry
If 17.14 grams of nitric acid are reacted with a large amount of aluminum metal, what volume of of hydrogen gas would be produced at STP? What would be the balanced equation for this problem?
July 13, 2011 by Bradley

Chem
How many grams of N2 are produced when 125g of NH3 reacts by the following? 4NH3+6NO--->5N2 +6H20 I know the answer but I do not know how to do the problem. The answer in the book is 257g But what do I do? I am not even sure where to start? Thanks
October 1, 2011 by Connie

DR.BOB HELP CHEMISTRY!
How many milliliters of a 0.3 molar HCl solution are needed to react completely with 8 grams of zinc according to the following equation? ? HCl + ? Zn → ? ZnCl2 + ? H2 Answer in units of mL
October 4, 2011 by Rara

9th gradae physical science
teh density of copper is 8.92 g/cm3. If you plotted the mass of copper in grams versus the volume in cubic centimeters, what would the slope of the line be?
January 20, 2012 by allie

Chemistry
assuming complete dissociation of the solute, how many grams of KNO3 must be added to 275 mL of water to produce a solution that freezes at -14.5 C? The freezing point for pure water is 0.0 C and is equal to 1.86 C/m .
January 27, 2012 by Colin

Chemisty
Calculate the mass of water in grams that could be produced from the reaction of 10.00mL 0.4122M hydrochloric acid and 35.00mL 0.1738M sodium hydroxide solution. Identify the limiting reactant.
February 28, 2012 by Missy

Chemistry
a gas misture containing N2 and O2 was kept inside a 2.00 L container at a temp of 23.0 degrees C and a total pressure of 1.00atm. The partial pressure of O2 was 0.722atm. How many grams of Nitrogen were present in the mixture?
April 28, 2012 by RoseBud

chemistry
SrH2 + 2 H2O ==> Sr(OH)2 + 2 H2 Determine the number of grams of strontium hydroxide (Sr(OH)2) produced when 10.0 g of hydrogen gas (H2) is also produced. (Your answer must have at least 3 significant figures.)
May 1, 2012 by ani

chemistry
If the rocket engine contains 1500.0 grams of H2O2 and an excess of N2H4, what volume of water vapor will be produced when the rocket fires up to a temperature of 540C and a pressure of 1.2atm?
July 24, 2012 by Big Trav

College Chemistry
Using the accurate concentration that you measured in Part A (which is 14.77 ml), calculate the mass of HCl (in grams) present in a 15.00-mL sample of the acid solution, using proper dimensional analysis
December 2, 2012 by Alex

Chemistry 3A
C2H2(g)+ 5/2o2(g)-> 2Co2(g)+ H2o(g)+ 1255.8KJ how many grams of C2H2 are reacted when 310 KJ of heat are released? I left the oxygen (O) lowercase in the equation so it does not get mixed up with zero.
December 10, 2012 by Gurjot

Chemistry
When 50.0g of silicon dioxide is heated with an excess of carbon 32.2 g of silicon carbide I'd produced. SiO2(s) + 3C(s) → SiC(s) + 2CO(g) A. What is the percent yield of this reaction? B. How many grams of CO gas are made?
January 7, 2013 by Gloria

Chemistry
Zinc metal reacts with hydrochloric acid according to the following equation: Zn + 2HCl yields ZnCl2 + H2. How many grams of hydrogen gas can be obtained if 50.0 g of zinc react completely?
March 11, 2013 by Raymond

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