Number of results: 81,653
stoichiometry
Ammonia gas reacts with oxygen gas according to the following equation: 4NH3 + 5O2----4NO + 6H2O a. How many moles of oxygen gas are needed to react with 23 moles of ammonia? (29 mole) b. How may grams of NO are produced when 25 moles of oxygen gas react with an excess of ...
Wednesday, February 9, 2011 at 9:43pm by Jonathan
Chemistry
Convert 63.7 kg of oxygen to grams. Then use stoichiometry and convert the grams of Oxygen to moles of Oxygen, then moles of KNO3 using the equation. Calculations: 63.7 kg ---> 63,700 g. Divide by 32 grams of O2, then multiply by (4 moles KNO3/5 moles O2). For the ...
Tuesday, September 29, 2009 at 7:12pm by Nadine
organic chemistry
K(org/aq) = (grams/org solvent)/(g/aq solvent) 10 = (x grams/100 mL)/(4-x grams/100 mL) Solve for x, then calculate 4-x to determine the amount left in the aqueous phase.
Wednesday, November 3, 2010 at 11:38pm by DrBob222
Chemistry
What is the molar solubility of PbCl2 in a solution of 0.23 M CaCl2? Ksp = 1.6 10-5 for PbCl2. idk how to do this because of the Cl2
Monday, May 11, 2009 at 12:31am by Jason
Chemistry
Heres a balanced equation: Na2CO3(aq)+2AgNO3 (aq) --> 2NaNO3(aq)+Ag2CO3 (s) From this equation, 10 mL of AgNO3 in this contains 34 grams of AgNO3. Calculate the grams of solid product, Ag2CO3. Part 2: 10 mL of Na2CO3 in this experiment contains 21 grams of Na2CO3. ...
Wednesday, February 6, 2013 at 8:58pm by Sarah
Molecular calculations (chemistry)
If you had 19 grams of F, how much Ca would you need to convert all of the F to CaF2?
Tuesday, November 13, 2012 at 10:37am by Eliza
general chemistry
How many grams of Ammonium Nitrate would you use to make a 500 ml of 5.684 M solution? Answer
Sunday, September 23, 2012 at 5:13pm by Anonymous
7th grade science
if 200mL of water were used instead of 100mL,how many grams of the compound would dissolve at 40c
Monday, November 7, 2011 at 9:01pm by Anonymous
chemistry
the number of grams of KCI per 100g of water that would produce a saturated soluion at 50 degrees C is?
Tuesday, November 15, 2011 at 10:27am by Janet
Chemistry
How many grams of a 250- g sample of thorium - 234 would remain after 40 days had passed?
Sunday, October 23, 2011 at 2:31pm by Divine
physics
if you raise the temperature of 1000 grams of water by 17 degrees, how many calories of energy would you have added in
Wednesday, September 21, 2011 at 9:04pm by cece
Chemistry
How many milliliters of a 2.5 hydrochloric acid solution would be needed to react completely with 32.0 grams of magnesium metal
Thursday, June 16, 2011 at 7:33pm by Kyle
chemistry
how many grams of Copper (II) sulfate pentahydrate would you use to make 400.0 mL of .750 M solution?
Monday, June 13, 2011 at 8:51am by chelsea
Science. Please Help!
If you add 4 grams of KCl to 10g of water at 28 C, would the solution be saturated, unsaturated or supersaturated?
Monday, February 14, 2011 at 5:44pm by Anonymous
science
based on the relationship between mass and volume.... How much space would 75 grams of water occupy?
Thursday, January 6, 2011 at 3:15pm by jake
Science
Homw many grams of copper sulfate pentahydrate (CuSo4 5H2O) would you heat to produce 29.8 g of water?
Tuesday, March 9, 2010 at 5:51pm by Anne
stoichiometry problems
How many grams of NaCl with a molar mass of 58.44 would be needed to make 2.5 L of 0.00500 solution?
Sunday, November 23, 2008 at 7:38pm by Cindy
chemistry
Ca(OH)2 ==> Ca^2+ + 2OH^- Ksp = (Ca^2+)(OH^-)^2 Assuming you titrated with HCl, the equation is Ca(OH)2 + 2HCl ==> CaCl2 + 2H2O So at the equivalence point the pH = 7.45. I would convert to pOH (pH + pOH = pKw = 14), then pOH = -log(OH^-) to obtain (OH^-). For Ca...
Tuesday, November 1, 2011 at 10:07pm by DrBob222
science
Try some of the following links for information: http://search.yahoo.com/search?fr=mcafee&p=based+on+the+relationship+between+mass+and+volume....+How+much+space+would+75+grams+of+water+occupy%3F+ Sra
Thursday, January 6, 2011 at 3:15pm by SraJMcGin
Chemistry
Assume that the ionic compound CaCl2, seperates completely into Ca and Cl ions when it dissolves in water. How many moles of each ion are present in the solution???
Thursday, August 9, 2012 at 9:49pm by Serena
Chemistry
Please i need sum help in balancing these equations: 1)Phos(p)+Bromine(Br)=phostribromide(PBr) 2)Cacl2+NAHCO3+H2O=Nacl=Ca(OH)2+H2Co3 Thank You
Monday, February 4, 2008 at 6:22pm by eva
Chemistry
If you have two sets of conditions, the easy gas law to use is the (P1V1/T1) = (P2V2/T2) If you don't have two sets of data you almost certainly must use PV = nRT. Many times, and this problem is one of them, the problem gives grams so you calculate mols = n = grams/molar ...
Monday, November 12, 2012 at 7:25pm by DrBob222
AP CHEMISTRY
Theoretical yield is the amount calculated from the stoichiometry of the reaction. For example, suppose we wanted to calculate the theoretical yield of CO2 from the reaction C + O2 ==> CO2 if we had 24 g carbon initially. 24 g C = 24/12 = 2 mols C. 2 mols C produces 2 ...
Thursday, January 31, 2008 at 8:40pm by DrBob222
chemistry grade 11
I averaged the three readings and obtained 0.0276 L instead of 0.0277 L. So that will make a little difference. Then you are ok until you get to the 0.00831/0.010 step. If I wanted to calculate the percent of the acetic acid in the sample, I would use the grams (the previous ...
Monday, December 15, 2008 at 10:18pm by DrBob222
chemistry
For the balanced equation shown below, how many grams of O2 reacted, if 98.0 grams of HCl are produced? 2C6H4Cl2+7O2=>12CO+2H2O+4HCl
Tuesday, January 31, 2012 at 10:17am by Alen Maslo
Chemistry
Convert 43.82 g diborane to moles. #moles = grams/molar mass. Using the coefficients in the balanced equation, convert moles diborane to moles H3BO3. Do the same for moles H2. Convert moles H3BO3 to grams. Convert moles H2 to grams. #grams = moles x molar mass.
Sunday, September 27, 2009 at 10:22pm by DrBob222
Chemistry lab
just gonna post my answer to see if more can be added or fixed 1. In trail one CaCl2 will react completely (limiting regent) which limits the complete reaction of NaSO4 (excess regent) therefore creating a precipitate of sulfur. In trails 2-4 as the concentrations increase the...
Monday, November 5, 2012 at 3:26pm by Tara
Chemistry
1.33 m = 1.33 moles (Et)2O in 1 kg THF. 1.33 moles = 1.33 x 74.12 grams = 98.58 g so the total solution has a mass of 1000 g + 98.58 = 1098.58 grams. You want 471.6 grams (Et)2O which is 471.6/74.12 = 6.363 moles. So you need to take 1098.58 g solution x (6.363 moles/1.33 ...
Monday, March 1, 2010 at 3:13am by DrBob222
Science
Calculate the molarity of the following solution: 7.48g of calcium chloride (CaCl2) in 215 mL of aquous solution.
Friday, October 19, 2012 at 2:30pm by Emily
chem
calculate the solubility of Ca(OH)2 in a 0.469M CaCl2 solution at 31 degrees C, Ksp of Ca(OH)2 is 4.96 X 10*-6
Wednesday, June 2, 2010 at 9:21pm by Chloe
Chemistry
1. Write the balanced chemical equation for the reaction: 2C2H6 + 7O2 = 4CO2 + 6H2O 2. Determine moles C2H6 and O2. moles C2H6 = 20.0 grams C2H6 x (1 mole C2H6/30.0692 grams C2H6) = 0.665 moles C2H6 moles O2 = 60.0 grams O2 x (1 mole O2/32 grams O2) = 1.875 moles O2 3. ...
Thursday, March 14, 2013 at 4:53pm by pls help
chem
the combustion of 1.83 grams of a compound which only contains C,H, and O yields 4.88 grams of CO2, and 1.83 grams of H2O. What is the empirical formula of this compound? ------------------------------------------ 4.88 g CO2 x 1 mol CO2/44.01 g CO2 x 2 mol O2= .2217 mol O2 1....
Sunday, August 19, 2012 at 1:14pm by greeny
science
Here is how you do the first one. k = 0.693/t1/2 Substitute 24,000 for t1/2 in the above equation and calculate k. Then substitute k into the following equation. ln(No/N) = kt No = 100 grams = what you start with. N = what you end up with and this is the unknown. k from above...
Monday, September 10, 2007 at 8:43pm by DrBob222
Chemistry
If I assume 0.220 is grams. If I assume burned in ..... is burned in excess of oxygen. If I assume 0.343 is grams. Here is what you do. Look at the balanced equations. 2CH3OH + 3O2 ==> 2CO2 + 4H2O C2H5OH + 3O2 ==> 2CO2 + 3H2O --------------------------- let x = ...
Sunday, September 16, 2012 at 2:55pm by DrBob222
CHEMISTRY HWK MAKES NO SENSE
How many grams of C are required to make 464.99 grams of this compound? compound= C3H8
Thursday, November 29, 2012 at 7:02pm by HELP
Math
Stephanie got a travel pack of 4 aspirin, each 500 milligrams. How many total grams are in the pack 2 grams?
Tuesday, November 6, 2012 at 7:40pm by Jerald
Chemistry
The solubility of AlCl(3) is 46.6 grams in 100 mL in water. How many grams of AlCl(3) will dissolve in 1.68 L?
Sunday, May 20, 2012 at 3:46pm by Sharmin
Chemistry
The solubility of AlCl(3) is 46.6 grams in 100 mL in water. How many grams of AlCl(3) will dissolve in 1.68 L?
Sunday, May 20, 2012 at 2:59pm by Sharmin
chemistry
If 75.0 grams of water is decomposed into hydrogen and oxygen, how many grams of hydrogen should be formed?
Monday, March 12, 2012 at 8:09pm by stoi.
chemistry
If 75.0 grams of water is decomposed into hydrogen and oxygen, how many grams of oxygen should be formed?
Monday, March 12, 2012 at 8:05pm by Anonymous
chemistry
How many moles do you need in the final solution? That is M x L = ? Then moles dextrose = grams/molar mass. Solve for grams.
Friday, December 2, 2011 at 1:12am by DrBob222
Physics
Mass is measurd in kg Not grams. S0 you must convert to kg: divide grams by 1000.
Tuesday, November 29, 2011 at 10:44pm by Henry
Chemistry
what is my percent yield if i had 1.46 grams of copper to start with and ended with 2. 47 grams of copper?
Tuesday, June 14, 2011 at 12:03am by megan
chemistry
what is my percent yiel if i had 1.46 grams of copper to start with and ended with 2. 47 grams of copper?
Tuesday, March 1, 2011 at 9:16pm by megan
Science
Determine the number of grams of KNO3 which will dissolve in 100 grams of H20 at 100 degrees celscius?
Wednesday, February 9, 2011 at 2:11pm by Jessica
CHEM
HOW MANY GRAMS OF SALT ARE REQUIRED TO PREPARE 300 G OF 15% SALT SOLUTION? HOW MANY GRAMS OF WATER ARE NEEDED?
Saturday, December 4, 2010 at 3:14am by Anonymous
Chemistry
N_2+3H_2-->2NH_3 How many grams of H_2 are needed to react with 3.20 grams of N_2
Saturday, October 23, 2010 at 1:51pm by Doug
chemistry
What is the total sample size (in grams)for a sample of ethanol (CH3CH2OH) which contains 3.39 grams of oxygen?
Wednesday, September 22, 2010 at 8:27pm by Grace
Chemistry
Is that 1168 kJ for the reaction (4 moles NH3 or 68 grams) or kJ/mol (for 17 grams).
Thursday, March 18, 2010 at 8:48pm by DrBob222
chemistry
yes. m = mols solute/kg solvent You will need the densities to convert grams to volume and volume to grams.
Tuesday, March 2, 2010 at 11:14pm by DrBob222
Chemistry
It depends on what the material is. If you know the density in grams/milliliter, the number of grams for 1 mL is numerically equal to the density.
Monday, September 21, 2009 at 8:00pm by GK
Chem hwk
Your friend is right. mols needed = M x L = 13317*0.504 = ? Then mol = grams/molar mass so ?mols x molar mass Ci(NO3)2 = ? and I get something like 126 grams or so. Convert g Cu(NO3)2 to mols. mols = grams/molar mass Then M = mols/L soln. The answer is about 0.9 M.
Monday, April 29, 2013 at 12:12pm by DrBob222
chem
The molarity and the molality of a solution prepared by dissolving 2.00 g of ethanol C2H5OH with 100.0 g of water to give a final volume 102 mL are would i just add both the grams and divide by 102 for molarity? and molalty i would just add the mass?
Friday, August 8, 2008 at 6:49pm by so
Chemistry
I have a problem that has been driving me crazy trying to solve, and I was wondering if someone could help. The problem is this: "Given the reaction: CuSO4 + 4 NH3 ----> Cu(NH3)4SO4, if 10 grams of CuSO4 reacts with 30 grams of NH3, what is the theoretical yield of...
Thursday, August 23, 2007 at 1:10pm by Josh
chemistry
Fist, you want to convert 5 lb candy to grams. We know 1 lb = 454 grams. We can write the conversion factor as 1 lb/454 g OR we can write it as 454 g/1 lb. How do we know which factor to use (which may be your problem). Here is how to do it. 5 lb Hershey x (factor) = ?? grams ...
Saturday, October 30, 2010 at 4:13pm by DrBob222
Chemistry
I would add the two equations needed together to achieve the final one desired. I think doing it piecemeal just complicates the process. Ca(NO3)2.4H2O + 2KIO3 ==> Ca(IO3)2 + 2KNO3 + 4H2O. 1. You want 10 g Ca(IO3)2. Convert that to moles. #moles = grams/molar mass. 2. ...
Saturday, January 23, 2010 at 12:17am by DrBob222
Chemistry
2 SO2 (g)+O2 (g)→2 SO3↑ How many grams of SO3(g) are formed if 8.45 grams of oxygen are used?
Monday, February 18, 2013 at 12:37am by Joe
Chem
Check the problem. It asks for GRAMS, not tons. I obtained 168.6 tons.Convert that to grams and round to two s.f.
Monday, September 17, 2012 at 3:42pm by DrBob222
chemistry
Let x = grams in ether extract, then 1.5-x = grams in water Korg/aq = (x/15)/[(1.5-x)/45]=5.8 Solve for x and 1.5-x.
Friday, October 7, 2011 at 11:30pm by DrBob222
Chemistry
Use PV = nRT and solve for n. Remember that T must be in kelvin. Then n = grams/molar mass. Solve for grams.
Saturday, March 19, 2011 at 2:02pm by DrBob222
chemistry
a chemist pours 20 grams of a liquid into a beaker. what is the volume of the liquid if it has a density of 2.5 grams/ml.
Tuesday, March 1, 2011 at 2:30pm by bwheeler
Chemistry
Use PV = nRT and solve for n. Don't forget to convert T to Kelvin. Then n = grams/molar mass Solve for grams.
Monday, January 24, 2011 at 9:05pm by DrBob222
Chemistry
If 12.8 grams of Hydrogen reacts with 18.6 grams of oxygen it produces water. How much water was produced
Monday, July 19, 2010 at 2:52pm by john
chemistry
Use PV = nRT with P in atmospheres and T in Kelvin, solve for n. Then moles = n = grams/molar mass and solve for grams.
Saturday, October 9, 2010 at 6:30pm by DrBob222
Chemistry
#1 has m listed in the problem. #2 and #3 has grams listed. grams/molar mass = moles and molality = mols/kg solvent.
Wednesday, May 5, 2010 at 6:25pm by DrBob222
chemistry
Use PV = nRT to calculate n, then n = grams/molar mass to solve for grams. Don't forget to use Kelvin for T.
Sunday, February 14, 2010 at 7:35pm by DrBob222
chemistry
how many grams of HNO3 can be produced if 225 grams of NO2 is mixed with 55.2 g of H2O? 3NO2 + H2O=2HNO3 + NO
Sunday, January 24, 2010 at 1:51am by jenny
Chemistry
Convert the grams to moles by dividing the grams by the formula mass. Multiply the number of moles by 22.4 L/mol.
Thursday, December 11, 2008 at 10:43pm by GK
oops--Chemistry
The question asked for grams PbCl2. x is in M, then mols = M x L and mols x molar mass = grams
Saturday, December 15, 2012 at 11:25pm by DrBob222
chemistry
How many mols do you want? That is M x L = 0.500 x 4.8 = ? grams = mols x molar mass. That will give you grams HCl to use.
Sunday, September 9, 2012 at 9:05pm by DrBob222
Physics
How old is the bone? Ifthere are 10 grams of C14 for every 1000 grams of bone?
Sunday, December 9, 2007 at 4:36pm by Lee
chemistry
How many moles do you need? That is M x L = 3.0M x 0.250L = ? Then moles = grams/molar mass. Solve for grams.
Wednesday, December 7, 2011 at 11:15am by DrBob222
Chemistry Help please!
How many moles do you need? That will be M x L = ? Na2CO3. Then moles = grams/molar mass. Solve for grams.
Monday, October 3, 2011 at 5:57pm by DrBob222
chemistry
moles = grams/molar mass. Be sure to change mg to grams. Then M = moles/L of soln.
Friday, December 3, 2010 at 11:32pm by DrBob222
CHEMISRTY
HOW MANY GRAMS OF MAGNESIUM ARE REQUIRED TO PRODUCE 2.154 GRAMS OF PRODUCT? STEP BY STEP EXPLAINATION
Sunday, February 28, 2010 at 5:01pm by Donna
Chemistry
4HN3 + 5 O2 = 4NO + 6 H20. How many grams of O2 are required to produce 90 grams of NO?
Wednesday, July 23, 2008 at 12:45am by Persia
science
what is the karat count of gold in a bracelet that contains 15 grams of gold and 5 grams of silver
Tuesday, May 13, 2008 at 8:28pm by demarco
chemistry
2.5 L x (1,000 cc/L) x (0.79 g/cc) = ?? grams. Then ?? grams x (1 lb/453.6 g) = xx lbs.
Thursday, February 14, 2008 at 2:19pm by DrBob222
chemistry
Calculate the theoretical amount of CaCl2 that would be required to change the temperature of 50 mL of water from from temperature 20 degrees Celsius to 45 degrees Celsius. Remember that the heat lost during the dissociation is equal to the heat gained by the 50.0 mL of water...
Saturday, November 6, 2010 at 6:32pm by Pat
Chemisrty
Calculate the theoretical amount of CaCl2 that would be required to change the temperature of 50 mL of water from from temperature 20 degrees Celsius to 45 degrees Celsius. Remember that the heat lost during the dissociation is equal to the heat gained by the 50.0 mL of water...
Tuesday, February 23, 2010 at 1:33am by sakura_09
chemistry
determine the number of grams of NH3 produced by the reaction of 3.5g of hydrogen gas. 1. Write the equation and balance it. N2 + 3H2 ==> 2NH3 2. Convert 3.5 g H2 gas to mols. mols = grams/molar mass. 3. Convert mols H2 gas to mols NH3 using the equation from step 1. 4...
Saturday, August 11, 2007 at 12:18am by danni
chemistry
CaCO3 + 2HCl ==> CaCl2 + H2O + CO2 11.2 L CO2 (atSTP) = 11.2/22.4 = 0.5 mol. 1 mole CO2 in the reaction = 1 mole CaCO3 initially; therefore, 0.5 mole CO2 means you started with 0.5 mol CaCO3. grams = moles x molar mass = ?? Since the marble is only 95% pure, you must ...
Saturday, September 10, 2011 at 11:11am by DrBob222
Chemistry
I believe you need to rethink this question. For example, in the freezing point depression, we have delta T = Kf* molality and molality = moles solute/kg solvent and moles solute = grams/molar mass. So I would think adding grams makes more moles and more moles increases ...
Sunday, April 11, 2010 at 1:05am by DrBob222
chemistry
For NaCl, 1 equivalent is the same as 1 mole. 154 mEq/L = 0.154 Eq/L = 0.154 mole/L So you want g = moles x molar mass = 0.154 x 58.5 = grams/L. For 20 L you want 20x that. If you don't want to go through the conversion each time, just remember that mEq x milliequivalent ...
Sunday, February 27, 2011 at 4:04pm by DrBob222
chemistry
Use density of ethanol to convert mL ethanol to grams. Then mol = grams/molar mass. Then M = mols/L solution.
Monday, March 11, 2013 at 7:19am by DrBob222
chemistry
The reaction of 9.3 grams of fluorine with excess chlorine produced 4.1 grams of ClF3. What percent yield of ClF3 was obtained?
Thursday, August 30, 2012 at 10:17pm by Nick
chem1151
If 2.68 grams of Copper was recovered and you started with 8.94 grams of Copper(II)chloride,then what is the percent yield of the reaction?
Thursday, March 8, 2012 at 7:58pm by linda
Chem
calculate the mass in grams of carbon needed to produce 160 grams of CO2 burning. C + O2 -> CO2
Thursday, December 15, 2011 at 10:52am by Amber
Chemistry
How many grams of NH3 can be produced from 3.26 moles of N2? How many grams of H2 are needed to produce 13.99 g of NH3?
Sunday, November 6, 2011 at 11:35pm by Natalie
chemistry
What is the percent by mass concentration of KCl in a solution prepared by adding 80 grams KCl to 200 grams of water?
Tuesday, October 11, 2011 at 10:25pm by Cristina
geometry
The density of a block of wood is 0.78 grams per cubic centimeters. What is the volume of the block if its mass is 28.8 grams?
Friday, February 18, 2011 at 3:36pm by mariah
chemistry
finding the largest mass of Aluminum chloride that can be formed when reacting with 31 grams of aluminum with 36 grams of chlorine
Tuesday, February 15, 2011 at 10:59am by Anonymous
Chemistry
if 30.0 grams of molten iron (III) oxide reacts with 275 grams of aluminum, what is the mass of the iron produced.
Sunday, December 5, 2010 at 10:32pm by Kalen
chemisrty
If 55.0 grams of KCIO3 is decomposed by the following equation, how many grams of oxygen can be produced? 2 KCIO3 > 2 KCL + 3 O2
Tuesday, June 29, 2010 at 11:21pm by gary
Chemistry
If 4.56 grams of NaOH and 56.3 grams of Ca(OH)2 are added to enough water to make 1.50 L of solution, what will the pH be?
Sunday, March 14, 2010 at 10:53pm by Alice
math
Milliliters into Grams: Multiply the specific gravity of the substance by the number of milliliters, to obtain the weight in grams.
Tuesday, January 15, 2008 at 5:42pm by Ms. Sue
Chem
How many grams of Ni would be electroplated if a constant current of 7.2 amperes is passed through a solution of NiSO4 for 90.0 min?
Tuesday, March 19, 2013 at 4:40pm by George
chemistry
if 125g of magnesium sulfate heptahydrate is completely dehydrated, how many grams of anhydrous salt will remain? i would really appreciate anyone's help
Thursday, February 21, 2013 at 1:59pm by rose
Chemistry
How many grams of magnesium sulfate would you need to make 0.500 L of a 10.0% M/V solution in water? Please show work.
Monday, February 18, 2013 at 8:39pm by Margaret
general chemistry 2
How many grams of urea [CO(NH2)2] would be required to prepare 200 mL of a 5.0 x 10-3 molar solution? Answer
Wednesday, September 26, 2012 at 3:46pm by Anonymous
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