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September 16, 2014

Search: empirical formula

Number of results: 7,739

chemistry
complete combustion of a 0.0100mol sample of hydrocarbon, CxHy, gives 1.344 L of CO2 at STP and 0.720 g of H2O. a. what is the molecular formula of hydrocarbon? b. what is the empirical formula of hydrocarbon?..
November 28, 2011 by SHY

chemistry
Boron forms a gaseous compound with hydrogen with empirical formula BH3. a 1.05L sample of this compound at a pressure of 88 mm Hg at 295K has a mass of .138g. what is the molecular formula of the compound?
January 3, 2012 by mary

Chemistry
What is the empirical formula for Dichloroethane?
October 18, 2010 by Amber

chem
What is the empirical formula for Ba(NO3)2
December 10, 2010 by pete

Chemistry
what is the empirical formula for a compund with 26.2 g N, 7.5 g H, and 66.3 g Cl?
February 26, 2013 by Anonymous

chemistry
A 12.0g sample of carbohydrate contain 4.50g of carbon, 3.25g of oxygen, and some hydrogen. Determine the percent by mass of hydrogen in your product. Find the empirical formula for a compound that consists of aluminum and chlorine in which the aluminum is 20.2 % by mass. . A ...
March 13, 2012 by jhong

Chemistry
In the experiment 0.500 g of copper reacted with oxygen to give 0.563 g of copper oxide. What is the empirical formula of the oxide expressed as a chemical formula?
October 24, 2012 by Brenda

Physical science
1. Nicotine,a poisonous compound found in tobacco leaves,is 74% carbon,8,65% hydrogen and 17,35% nitrogen (a)calculate the empirical formula of nicotine (b)what is the molecular formula of nicotine if it has a molar mass of 165 g.mol^-1
September 11, 2014 by Please help please

College Chemistry 3
Find the empirical Formula of a compound that is 30.4% nitrogen by mass, and consists of only nitrogen and oxygen. What is its molecular formula if its molar mass is 92g/mol?
August 15, 2012 by Ernesto

Chemistry
How do I find the empirical formula of FeSO4? Thanks!
June 5, 2008 by -

maths
what is the empirical formula of a compound containing C(60%), H( 4.44)
November 27, 2010 by Anonymous

Chemistry
What is the empirical formula of caffeine (C8 H10 N4 O2)? How do I get it? Thanks
February 10, 2011 by Cad

Chemistry
What's the correct empirical formula for CO2?
August 17, 2013 by Vanessa

Chemistry
A 7.85 g sample of a compound with the empirical formula C5H4 is dissolved in 301 g of benzene. The freezing point of the solution is 1.05C below that of pure benzene. what are the molar mass and molecular formula of this compound?
October 1, 2013 by niki

chemistry
An analysis of an unknown compound found it contained 40 g potassium, 52 g chromium and 56 g of oxygen. a) What is the empirical formula for this compound? Show the work you did to determine the formula. b) What type of compound is it, ionic, covalent or a combination of both...
December 14, 2010 by cam

chemistry.
What is the empirical formula of a hydrocarbon that contains 89,94 by mass?
September 25, 2009 by peter

chemistry.
What is the empirical formula of a compound that contains 29% Na, 41% S, and 30% O by mass?
September 27, 2009 by mary.

science
A compound contains 3.99% P, 82.3% Br, and 13.7% Cl. Find the empirical formula
July 11, 2010 by Anonymous

Chem
What is the empirical formula of a compound that contains 27.0%S, 13.4%O,and 59.6%Cl by mass?
December 8, 2010 by Kay

Chemistry
What is the empirical formula of a hydrocarbon that contains 89.94% C by mass?
September 18, 2011 by Mark

Chemistry
What is the empirical formula of a hydrocarbon that contains 89.94% C by mass?
September 18, 2011 by Mark

Chemistry
Empirical formula 12.67 aluminum, 19.73 nitrogen, 67.60 oxygen
March 26, 2012 by Jeff

Chemistry
Calculate empirical formula C=41.7%,H=6.2%,N=19.3%, and O=33.1% Thanks. any help at all will be awesome!
April 22, 2014 by Greg

science
How do work out what the empirical formula for aluminium selenide is? You need to provide the data. It's easier to explain with numbers than try to go through it with words. You do you not have numbers? Perhaps the question is, "How do we know what the formula of aluminum ...
February 6, 2007 by sarah

chemistry
3. Another volatile liquid was used in a similar experiment. A student found that 0.32 g of vapor had a volume of 152ml at 100 celsius and 1 atm. What was the molar mass of this gas? 4. The empirical formula of the unknown gas in question 3 is CH4O. What is the molecular ...
May 2, 2012 by preshi

empirical formula of a compound
how many grams of Mg combine with 1.50 g of Cl ions in MgCl2 ?
October 9, 2010 by r2rou2a

Chem
what is the empirical formula of aspirin, C9H8O4? is it the same again ?
January 2, 2011 by erik

Chemistry
Please help me solve this empirical formula.Im so confused C=58.5% H=4.1% N=11.4% and O=26.0% Thank you so much
May 3, 2014 by Roger

AP Chemistry
Anthraquinone contains only carbon, hydrogen, and oxygen and has an empirical formula os C7H2O. The freezing point of camphor is lowered by 22.3 C when 1.32 g anthraquinone is dissolved in 11.4 g camphor. Determine the molecular formula of anthraquinone
November 23, 2010 by Anonymous

Chemistry
The empirical formula of a compound is CH2O and the molecular mass is 180. What is the molecular formula of the compound?
December 14, 2010 by Haley

Chemistry
Predict the empirical formula of the ionic compound, Cs and C. How would I do this? Is it Cs_2C?
October 7, 2010 by Anonymous

Chemistry
What is the empirical formula of a compound that has a carbon-to-hydrogen ratio of 2 to 6? Is it CH3?
December 4, 2010 by danny123

Chemistry
What is the empirical formula if given c-.1929 h-.01079 o-.08566 cl-.1898
January 30, 2012 by J

Chemistry 3A
calculate the empirical formula for an unknown compound from the following information: C= 39.2%, H= 8.73% and O= 52.1%
December 10, 2012 by Gurjot

Chemistry
2) What is the empirical formula of a compound containing C, H, O if combustion of 1.23g of the compound yields 1.8g CO2 and .74g of H2O 3) What are the empirical and molecular formulas of a hydrocarbon if combustion of 2.10g of the compound yields 6.59g CO2 and 2.7g H20 and ...
April 10, 2014 by Annabelle

chemistry
A 25g sample of a compound composed of Carbon, Hydrogen, and Oxygen was combusted. 55grams of Carbon Dioxide and 30 grams of water were collected. A) What is the empirical formula of the compound? B) If the compound has a molar mass of 120g what is the molecular formula?
October 8, 2010 by Olga

chemistry
A solution is prepared with an unknown compound with an empirical formula of C3H7NO. The solution is made by dissolving 30.0 mg of compound in 1.200 g of the organic solvent biphenyl. The freezing point was depressed by 1.37C. What are the molar mass and molecular formula of ...
February 12, 2011 by Ellene

Chemistry
Hi Im reposting incase my original post doesn't get read. Please see bottom for additional info that I need help getting verified. Many thanks Hi Please help verify my answer to the following question: 0.500g of pure phosphorous was burned in excess pure oxygen to give a ...
October 16, 2011 by Helpme

chemistry.
What is the empirical formula of a compound that contains 29% Na, 41% S, and 30% O by mass? ..My answer is NaSO and I am not sure... can anyone help me for it?????????
September 25, 2009 by Help generation

Chemistry
Determine the empirical formula for the compound that contains 55.0 g carbon and 294 g sulfur
June 3, 2010 by Anonymous

chemistry
Predict the empirical formula of the compound formed by each of the following pairs of elements.a) Li,S b) Na,H c) Al,l d) Ca,O
January 30, 2011 by Ernest

Chemistry
What is the empirical formula of a compund composed of 3.25% hydrogen(H), 19.36% carbon(C) and 77.39% oxygen(O) by mass?
September 18, 2011 by Jerry

Chemistry
Calculate the empirical formula for the compound 1.245g Ni, 5.381g I Can you help with the steps please
September 25, 2011 by Monique

Chemistry
What is the empirical formula for a compound which contains 67.1 percent zinc and the rest is oxygen
January 23, 2012 by Wendy

matla
4.6 g of an oxide of nitrogen contains 3.2 g of oxygen. Calculate the empirical formula of the compound.
September 7, 2013 by kevin

chem
combustion analysis of a 285.7 mg sample of a hydrocarbon produces 880.8 mg of CO2 ans 405.7 mg of H2O. What is the empirical formula of the compound? a rough measurement of the molecular weight indicates it is a little over 100mg/mol. what is the molecular formula of the ...
February 7, 2011 by Braydon

chem
methyl salicylate has a mass percent composition of 63.2% C, 31.6% O, and 5.26% H.The mass of one molecule of the compound is 2.53 x 10^-22.Determine the empirical formula and the molecular formula for methyl salicylate.
July 12, 2011 by pop

chemistry
Derive the empirical formula of a hydrocarbon that on analysis gave the following percentage by mass composition: C = 85.63 % and H = 14.37 %. If the molecular mass of this compound is 56 g, derive the molecular formula.
May 30, 2013 by Hanin

chemistry
A liquid was analyzed to be 54.5% C, 9.10% H, and 36.4% O. An empty flask, whose mass was 45.32 g, when filled with the vapor of the liquid at 735mm Hg and 99.2C had a mass of 46.05 g. The volume of the flask was found to be 263.2 mL. empirical formula -> C2H4O What is the...
April 16, 2012 by josh

Chemistry 11
a gas has an empirical formula C6H7O5. When put in a 50mL bulb at 120 degrees celcius and 120kPa (pressure) it's mass is determined: the mass is 10.37 times as much as C6H6O. What is the molecular formula of the gas (C6H7O5)?
November 5, 2012 by Anna

chem 11
a gas has an empirical formula C6H7O5. When put in a 50mL bulb at 120 degrees celcius and 120kPa (pressure) it's mass is determined: the mass is 10.37 times as much as C6H6O. What is the molecular formula of the gas (C6H7O5)?
November 5, 2012 by Anna

chemistry
a compound with the molecular weight of 276 grams was determined to be 39.10% carbon, 8.77% hydrogen, and 52.13% oxygen. what is the empiricial formula and the molecular formula for the compound? i do not know where to start! i worked it out and i got 276/100=2.76 do i round ...
November 28, 2009 by shelly

Chemistry
Tooth enamel is made up of hydroxyapatite, Ca_10(PO_4)_6(OH)_2 or the empirical formula, Ca_5(PO_4)_3(OH). Use the empirical formula for all calculations because stoichiometry plays two significant roles. A. Print the balanced chemical equation for the molar solubility of ...
April 7, 2011 by John

Chemistry
A 185.325 g sample of a compound of carbon, nitrgoen and hydrogen is burned completely. Calculate the empirical formula if 225.0 g of water and 230.0 g of NO2 is formed. In another experiment the sample was found to have a density of 10.9 g/L at 1.20 atm and 25.0 degrees ...
September 18, 2011 by Louis

Chemistry
Combustion analysis of a 1.00g sample of ascorbic acid yields 1.500g of CO2 and 0.409g of H2O. What is the empirical formula of ascorbic acid? (a. CHO B.CH2O C. C2H4O2 D. C3H4O3 E.Cannot be determined with the information given. ) Convert the 1.5 g of CO2 and 0.409 g of H20 by...
July 24, 2005 by Jon

AP Chemistry
An organic compound was synthesized and found to contain only C, H, N, O, and Cl. It was observed that when .150g sample of the compound was burned, it produced .138g of CO2 and .0566g of H2O. All the Nitrogen in a different .200g sample of the compound was converted to NH3, ...
September 15, 2009 by Monique

chemistry
Calculate the empirical formula of each compound from the mass-composition data given below. A)41%N and 59%O B)45%Na,23%P and 32%O
February 13, 2011 by twynna

Science-chemistry
A compound is found to have 56.4% potassium, 8.7% carbon, and 34.9% oxygen. What is the empirical formula?
November 29, 2011 by Angel

chemistry
2.8% hydrogen, 9.8% nitrogen,20.5% nickel, 44.5% oxygen, and 22.4% sulfur determine empirical formula for compounds
February 23, 2013 by tula

chemistry
What is the empirical formula of a compound that is 14 g calcium, 11 g oxygen, and 0.7 g hydrogen? A. CaO2H B. Ca2OH2 C. CaOH D. Ca(OH)2
August 15, 2013 by Adam

Chemistry
i asked this question earlier and thanks to dr bob i got the empirical formula. which is C6H3O2. I need help finding the molar mass to get the molecular formula. Terephthalic acid is an important chemical used in the manufacture of polyesters and plasticizers. It contains only...
April 25, 2010 by sean P.

chemistry
Determine the empirical formula of a compound found to contain the following 52.11% carbon, 13.14% hydrogen, and 34.75% oxygen
October 19, 2009 by lynda smith

chemistry
Determine the empirical formula of a compound that contains 0.171 g of carbon combined with 0.471 g of oxygen.
September 12, 2011 by Geraldlyn

chemistry
Determine the empirical formula of a compound that contains 0.171 g of carbon combined with 0.471 g of oxygen.
September 12, 2011 by Geraldlyn

chemistry
Determine the empirical formula of a compound that contains 0.171 g of carbon combined with 0.471 g of oxygen.
September 12, 2011 by Geraldlyn

Cedar High school
A compound is found to have 56.4% potassium, 8.7% carbon, and 34.9% oxygen. What is the empirical formula?
November 29, 2011 by Angel

Chemistry
Combustion analysis of 0.343 g of a compound containing C, H, and O produces 0.753 g of CO2 and 0.411 g of H2O. Mass spectral analysis shows that the compound has a molar mass around 120 g mol-1. What is the compound's: Empirical Formula:----- Molecular Formula:-----
March 25, 2010 by Abraham

chemistry
Combustion analysis of 0.213 g of a compound containing C, H, and O produces 0.468 g of CO2 and 0.255 g of H2O. Mass spectral analysis shows that the compound has a molar mass around 120 g mol-1. What is the compound's: Empirical Formula:(-------) Molecular Formula:(--------)
April 3, 2010 by sam

Chemistry
Combustion analysis of 0.284 g of a compound containing C, H, and O produces 0.623 g of CO2 and 0.340 g of H2O. Mass spectral analysis shows that the compound has a molar mass around 120 g mol-1. What is the compound's: Empirical Formula: Molecular Formula:
April 8, 2010 by Darali

Chemistry
My questions keep getting cut off. What am I doing wrong? Here is my question again. Thanks for the help. What is the empirical formula for a compound whose molecular formula is C2Cl6? a) CCl3 b) CCl4 c) C2Cl6 d)CCl e) more info needed I think the answer is E more information ...
October 25, 2009 by Mattt K

chemistry
Hi, Is the molecular formula different when it is in a gaseous state? Cheers ;) Sometimes yes, sometimes no. H2O, for example, is thought to be in a group of 6 as a liquid at room temprature, a group of 4 at higher temperatures, and single H2O molecules as steam. Thanks, Ive ...
February 6, 2007 by bertie

chemistry
how would you do the Empirical And Molecular formula stuff i got three elenments that are Carbon with 78.23% , Hydrogen with 6.56% , and Nitrogen with 15.21%
November 21, 2008 by james

Chemistry
If you use a different mass of magensium metal in an experiment would the empirical formula of the compund be the same?
October 20, 2010 by Ash

chemistry 110
Calculate the empirical formula of a compound containing 52.14% C, 13.12% H, and 34.73% O. I dont understand how they got the answer. please help
December 15, 2010 by kim k

chemistry 101
Calculate the empirical formula for the following compound: potassium tartrate found in baking powder: 20.8% K, 2.7% H, 25.5% C, and 51.0% O
July 8, 2011 by ABCD

organic chem
If carbon =62.07%,hydrogen=10.34%, and oxygen=27.59%. Determine its empirical formula, name each of them. Do not consider ones > 6-carbons.
June 13, 2013 by Lorenzo

Chemistry
What is the empirical formula of a compound that is 14g calcium, 11g oxygen, and 0.7g hydrogen? A. CaOH B. Ca(OH)2 C. Ca2OH2 D. CaO2H
August 27, 2013 by Amy

chemistry
in an experiment a sample of hydrocarbon was analyzed. The sample contained6 g of carbon and 1.344 g Hydrogen. a) whats the empirical formula? the density of hydrocarbon at 25 C and 1.09 atm is 1.96 g/L b.) whats the molar mass of the hydrocarbon? c) whats the molecular formula?
March 10, 2010 by hilde

Chemistry
How do I find the percent composition of H2O: 20.14grams C2O4: 51.64grams Fe 3+: 11.34grams K^+: 15.06 grams and the empirical formula with these numbers
May 4, 2008 by LT

Science
If you lost some metal while transferring it from the balance to the evaporating dish, how would your empirical formula be affected?
July 4, 2013 by Lela

Chemistry
What is the empirical formula for aluminium selenide? What is the common oxidation state of aluminum? Combine that information with the valency for selenium that you came up with in the previous question to come up with the formula for aluminum selenide. If your are being ...
February 19, 2007 by sarah

chemistry
If you had used a different mass of magneisium metal would you expect the empirical formula of the compiund to be the same? explain
September 13, 2009 by ANON

Chemistry..
A compound whose empirical formula is NO2 could have a molecular mass of what? a) 23 b)39 c)92 d)120 0 please explain and show your work.....
December 17, 2012 by Anonymous

Chemistry
A compound is 54.52% C, 9.15% H, and 36.32% O by mass. What is the empirical formula? The molecular mass of the compound is 132 amu. What is the molecular formula?
September 18, 2011 by Jerry

chemistry
a flask with a volume of 267.5 mL contains a few milliliters of a volatile hydrocarbon. after vaporizing the gas at 100 degrees C, the flask is weighed and found to contain 0.728 grams of hydrocarbon vapor at 755 mmHg. a seperate combustion analysis experiment revealed that ...
March 14, 2011 by Rachel

Chemisty!
a flask with a volume of 267.5 mL contains a few milliliters of a volatile hydrocarbon. after vaporizing the gas at 100 degrees C, the flask is weighed and found to contain 0.728 grams of hydrocarbon vapor at 755 mmHg. a seperate combustion analysis experiment revealed that ...
March 14, 2011 by Rachel

chemisrty
can anybody give me the density of arsenic oxide at STP is this the correct formula volume = mass/ density thanks Yes, but if you want the density, it is density = mass/volume. The number I have seen floating around on this board is 17.8 g/L but the density of a gas and the ...
February 4, 2007 by bex

chemistry
The mass of initial magnesium metal used do not affect calculation of determining the empirical formula. Why? Explain in terms of chemical laws.
July 26, 2010 by shirley

chemistry 101
Determine the empirical and molecular formula for a compound made from 54.09% calcium, 2.72% hydrogen, and 43.18% oxygen with a total molar mass of 222.3 g.
July 8, 2011 by ABCD

Chemistry
A sample of Freon was found to contain 3.21 g of C, 19.0 g of Cl, and 10.2 g F. What is the empirical formula of this compound? C0.0352Cl0.0705F0.0705 C0.5ClF C2Cl4F4 CCl2F2 CClF
October 1, 2011 by Anonymous

gen chemistry
I need help please?? Calculate the empirical formula for a compound composed of 13.27g Carbon and 70.9g sulfur. I got C1S2. Is this correct?
April 2, 2012 by rachell

CHEMISTRY
1. The percent composition by mass for peroxyacylnitrate (PAN) is:19.8% C,2.5% N, and the rest is oxygen. Determine the empirical formula of this compound. ...plz i really need your help!!!
June 6, 2013 by irfan

Chemistry
PLEASE PLEASE HELP How do i find the Empirical formula of CuCl2.5H2O
January 8, 2013 by Bobert Wells

Chemistry
A sample of unknown ore was analyzed and fgound to contain 12.7% Al, 19.7% N,and 67.6% O. What is the empirical formula of this ore?
December 8, 2010 by Becca

Chemistry
Complete combustion of 7.00 g of a hydrocarbon produced 21.4 g of CO2 and 10.2 g of H2O. What is the empirical formula for the hydrocarbon?
June 6, 2012 by Stephanie

chemistry
Complete combustion of 4.80 g of a hydrocarbon produced 15.6 g of CO2 and 4.80 g of H2O. What is the empirical formula for the hydrocarbon?
September 19, 2013 by college chem

chemistry
Complete combustion of 8.80 g of a hydrocarbon produced 27.1 g of CO2 and 12.5 g of H2O. What is the empirical formula for the hydrocarbon?
October 11, 2013 by Anonymous

science
find the empirical formula for a compound that consists of aluminum and chlorine in which the aluminum is 20.2% by mass
March 7, 2014 by joy

chemistry
a compound containing only carbon and hydrogen consists of 362 g of C and 30.1 g of H. what is the empirical formula of the compound?
November 30, 2010 by Lynn

Chemistry
A 6.0g of methane decomposes into 4.5g of Carbon adn 1.5g of Heydrogen. Determine the empirical formula of methane.
February 10, 2011 by Cecille

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