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May 6, 2016

Search: empirical formula

Number of results: 9,153

Chemistry
Is this correct? What is the experimental empirical formula of zinc chloride? Determine the simplest whole number ratio of moles of zinc used, to moles of chlorine reacted in the zinc chloride that was produced..028 moles of Zinc .025 moles of Cl .025 moles of Cl is smaller ....
October 26, 2009 by Madison

Chemistry
A compound has the empirical formula CHCl. A 256 mL flask, at 373 K and 750. torr, contains 0.800 g of the gaseous compound. Give the molecular formula.
November 6, 2010 by Justin

science
The mass of the empirical formula is 100g; the mass of the molecular formula is 200g. What is the value of n?
February 1, 2013 by Anonymous

science
The mass of the empirical formula is 100g; the mass of the molecular formula is 200g. What is the value of n?
February 1, 2013 by Anonymous

Chemistry
I am completing my lab and cannot figure this out. I need someone to go over it and make sure I am right because I can't figure out why my empirical formula does not match the molecular formula. #7 is the one I am really having a problem with, but here is all the info so you ...
July 28, 2010 by Ashley

Chemistry
For Peroxyacyl nitrate (PAN) A compound of C,H,N,O Determine the empirical formula from the percent composition by mass: 19.8% C, 2.50% H, 11.6% N What is its molecular formula given that its molar mass is about 120g?
August 25, 2010 by Amy~

CHEM QUESTION
In writing and balancing equations using sulfur chemists usually use the empirical formula, S, rather than the molecular formula. Why? I'm not sure how to answer this question.
March 2, 2016 by em

chemistry
Calculate the empirical formula for each of the following natural flavors based on their elemental mass percent composition. nitroglycerin (used medically as a vasodilator to treat heart conditions): C 15.87% H 2.22% N 18.50% O 63.41%. Express your answer as a chemical formula.
September 19, 2010 by Mely

chemistry
Calculate the empirical formula for each of the following natural flavors based on their elemental mass percent composition. nitroglycerin (used medically as a vasodilator to treat heart conditions): C 15.87% H 2.22% N 18.50% O 63.41%. Express your answer as a chemical formula.
September 20, 2010 by Mely

General Chemistry
Answer Check Please... A compund contains only hydrogen and nitrogen and is 12.6% hydrogen by mass. A gaseous sample of the compound has desity of 0.925g/L at 690 torr and 110 degrees Celsius. What is the molecular formula of the compound? My Empirical Formula = H2N Molecular ...
September 5, 2011 by Kathy

Chemistry
What is the empirical formula of a molecule containing 65.5% carbon, 5.5% hydrogen, and 29.0% oxygen? -I found this to be C3H3O and WebAssign says it's right. I need help with part b. If the molar mass of the above compound is 110 grams/mole, what is the molecular formula?
January 11, 2015 by Bridget

Chemistry
Xylose, a sugar isolated from wood, has the empirical formula CH2O. If a 6.25 mole sample of xylose has a mass of 938.3 g, what is xylose's molecular formula?
April 23, 2012 by Margie

Pressure and Molecular Formula
2. How much potassium chlorate is needed to produce 20.0 mL of oxygen at 670 mm Hg and 20 degrees C. 3. A certain compound containing only carbon and hydrogen was found to have a vapor density of 2.550 g/L at 100 degrees C and 760 mm Hg. If the empirical formula of this ...
December 8, 2012 by Amy

Chemistry (30s)
I need help on this question. I can't seem to understand it. Find the molecular formula of a compound with a gram molecular mass of 30 g and an empirical formula of CH3. Please show your work! and briefly explain how you got it!
March 23, 2016 by Candice

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
A compound has the empirical formula CHCL .A flask with volume 253 cm3 at temperature of 373K and pressure of 1.0 atm contains 0.8 g of the gaseous compound. Find the molecular formula of the compound.
February 22, 2016 by Amy

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 compound is 52.17 % C, 13.04 % H and 34.78 % O. What is its empirical formula?
May 13, 2015 by Nicole

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

Chemistry grade 11
An organic compound is composed of C, H and O. A 0.1005 g sample of this is combusted, producing 0.2829 g CO2 and 0.1159 g of H2O. What is the empirical formula of this compound? If the compound has a molar mass of 14 g/mol. What is the molecular formula?
January 10, 2015 by Sim

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
Calculate the empirical formula of Tylenol: C, 63.56%; H, 6.00%; N, 9.27%; O, 21.17%
March 26, 2016 by Jamie

Chemistry
Analysis of a sample of an organic compound showed it contains 39.9%carbon,6.9%hydrogen and 53.2%oxygen. a)calculate the empirical formula b)if the relative molecular mass is 60,what is the molecular formula of the compound.(C=12,H=1,O=16)
December 19, 2015 by Angel

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

Chemistry
What is the empirical formula for a compound that is 1.67g Ce and 4.54g I?
March 12, 2015 by Tiffany

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

Chemistry
A compound contains 69.9% iron and 30.1% oxygen. What is its empirical formula?
January 14, 2016 by Anonymous

Chemistry
A compound of B and H is found to have a mass percent composition of 81.1% Boron. Its empirical formula is B2H5. A mass spectrometry experiment tells us that the molecular mass is 53.3 g/mol. What is its molecular formula? So I feel like this is a trick question, because I ...
March 23, 2016 by Nikela

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
An organic acid has a percentage composition by mass of C 41.4%, H 3.4%, and O 55.2%. A solution containing 0.250g of the acid, which is dibasic required 26.60 cm cubed of NaOH solution (0.20 mol.dm -3) for neutralisation. Calculate the empirical formula, molecular formular, ...
September 20, 2014 by Manu

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
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
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
An unknown gaseous hydrocarbon contains 85.63 % carbon. If its density is 0.488 g/L at 0.355 atm and 100°C, what is the molecular formula of the gas? I can't figure this out. By assuming the total mass to be 100g, I get 85.63g C and 14.37g H which I then used to get the ...
March 18, 2015 by Michael

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

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.
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

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 99.2°C 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
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
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
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

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.

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

Chem
A 18.46 g sample of a compound contains 5.89 g potassium (K), 5.34 g chlorine (Cl), and oxygen (O). Calculate the empirical formula.
September 30, 2015 by Diana

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
what is the molar ratio of 0.114 copper to 0.116 oxygen? Then how do you make an empirical formula from this information?
October 7, 2014 by jo

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