Number of results: 1,078
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...
Sunday, July 24, 2005 at 8:47pm by Jon
in a gasoline engine the area in the cylinder head where the air and fuel mixture is burned is called the? What is the combustion chamber?
Friday, August 19, 2005 at 3:51pm by angela
why does a candle appear to go out when a copper coil is placed over the flame? Combustion requires three things: fuel (wax here), oxygen (air here), ignition temperature (a match here probably). Remove one and the combustion stops -- that's the principles firemen use to put ...
Wednesday, June 21, 2006 at 12:38am by jenna
Where does energy come from? Energy can come from the complete destruction of matter (as in nuclear reactions), or the rearrangement of electrons or other charged particles inside matter (as in chemical reactions) or from electromagetic fields (as in light and heat radiation...
Monday, July 24, 2006 at 6:21am by Sandra
I have to find the molar enthalpy of combustion of pentane. I have this info: 5C(s) + 6H2 >>> C5H12 Hf= -173.5kJ C+O2>>> CO2 Hf= -393.5kJ H2 + 1/2O2 >>> H2O Hf= -241.8kJ H2O >>> H2O Hf= +44.0kJ THEN I am given this: mass of pentane= 2.15g ...
Sunday, August 6, 2006 at 6:57pm by Hey!
PLEASE HELP! I'm doing a physics demonstration, and in part of it I'm trying to explain why steel wool burns and normal steel doesn't. I know it's something to do with the smaller surface area and/or mass but I don't know WHY it burns because of this. Can anyone help me? I'm ...
Tuesday, September 5, 2006 at 5:37pm by Jo
What is PbCO3(s)-->PbO(s)+CO2(g) A. neutralization B. metathesis C. combustion D. decomposition E. combination Looks like the lead carbonate is decomposing to lead oxide and carbon dioxide to me. check my thinking.
Friday, September 15, 2006 at 7:46pm by crystal
Is the molar enthalpy of combustion of pentane the same as the molar enthalpy of formation of pentane? No. The molar enthalpy for the combustion is for the reacton C5H10 + (15/2)O2 ==> 5CO2 + 5H2O The molar enthalpy for the formaton is 5C(graphite) + 5H2(g) ==> C5H10(l) ...
Thursday, September 21, 2006 at 11:03pm by B
Assuming the molor mass of paraffin is 280 g/mol, calculate the # of mols of paraffin burned. Then calculate the heat of combustion of paraffin in kJ/mol I don't think I can help you with the information provided. We need an equation (although we can wing that one) but we also...
Tuesday, September 26, 2006 at 9:37pm by dan
need help unscrambling a word or words tarluna what is it HELP ME UNSCRAMBLE THESE LETTERS TO MAKE A WORD THAT PERTAINS TO SPACE AND IS A P POSSESSIVE NOUN. SEGHRTMLAN J'aodredefis Please post the word or words you need to unscramble, and we'll try to help you. i cant figure ...
Thursday, September 28, 2006 at 3:34pm by amy
In a combustion reaction, do the products or the reactants store more energy? It is the products right? As heat energy goes into the products. Potential energy is greater in the reactants. Heat is lost in the reaction, so the products have lower energy. Imagine wood before it ...
Friday, March 2, 2007 at 9:39pm by Steve
Chemistry - Combustion
The standard enthalpies of formation of gaseous propylene (C3H6) and propane (C3H8) are +20.4kJ/mol and -103.8 kJ/mol. Their respective combustion reactions may be written as follows, where one mole of either gas is consumed by oxyen to yield carbon dioxide and water. ...
Tuesday, April 14, 2009 at 12:53am by Brigette
Chemistry - Combustion
You need the heats of formation of CO2 and H2O. That of O2 is zero by definition since is a naturally occuring state of an element. At 298 K, Hf of H2O is -57.8 kcal/mol and that of CO2 is -94.1 kcal/mol. Multiply those by 4.18 for kJ/mol. That makes -241.6 for H2O and -393.3 ...
Tuesday, April 14, 2009 at 12:53am by drwls
Chemistry Octane Combustion
Write the balanced equation for the combustion of octane (C8H18). Assuming that gasoline is 100% octane, with a density of 0.692 g/mL, what mass of CO2 is produced by combustion of 1.7 1010 gal of gasoline? Need help on how to get started, I have the balanced equation...
Tuesday, September 15, 2009 at 6:45pm by Chemistry
Chemistry - Combustion Method
This question is confusing me the way its presented and also is relating it to the combustion method that is used to analyze carbon and hydrogen. It can be used to give percent N. It says a sample of a compound that weighs 8.75 mg gave 1.59 mL of N2 at 25 degrees Celsius and ...
Saturday, May 1, 2010 at 9:49pm by Shinu
College Chem involving heat of combustion
Calculate the heat of combustion: 1.C2H4(g)+3O2(g)===>2CO2(g)+2h20(L) _____kJ/mol 2.2H2S(g)+3O2(g)===>2H2O(L)+2SO2(g) _____kJ/mol
Sunday, October 31, 2010 at 9:08pm by Anonymous
chemistry - combustion
Write the chemical equation for the complete combustion of each fuel. Then find the enthalpy of combustion, ΔHcomb, of each fuel. Express your answers in kJ/mol and kJ/g. Assume that water vapour, rather than liquid water, is formed in both reactions. CH4 + 2O2 ↔ ...
Friday, April 1, 2011 at 9:16am by Farah
Chemistry - enthalpy of combustion(help!!!)
i need help with the below question, i have tried answering it, but do not know where to go after the equations, please start me off on how to find the enthalpy of combustion of at least one.... Consider methane, CH4, and hydrogen, H2, as possible fuel sources. (a) Write the ...
Wednesday, June 8, 2011 at 10:12am by Farah
Ethene, also known as ethylene, is C2H4. The lower heating value (LHV) is 11,270 kcal/kg. You don't need that number to answer the question. The balanced reaction is C2H4 + 3 O2 -> 2 CO2 + 2 H2O 30 kmol/hr of ethene requires 90 kmol/hr of O2 for complete combustion. But ...
Wednesday, January 30, 2013 at 3:22am by drwls
Molar heat of combustion question!
Calculate the molar heat of combustion of paraffin, expressed in units of kJ/mol. First calculate the thermal energy released when one mole of parafin burns) because one mole of parafin (c25h52) has a mass of 325g, the molar heat of combustion will be 352 times greater than ...
Tuesday, February 5, 2013 at 4:55pm by Allyson