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April 19, 2014

Search: Chemistry - enthalpy of combustion(help!!!)

Number of results: 101,531

Chemistry
The enthalpy of combustion of benzoic acid is 26.4 kJ/g. What is the enthalpy of combustion expressed in joules per kilogram?
Wednesday, January 18, 2012 at 2:24pm by Cynthia

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

12 Chemistry
If you can do enthalpy change for the experiment (the combustion), that will be for so many grams of Mg, then multiply by molar mass Mg to get molar enthalpy of combustion.
Saturday, March 29, 2008 at 10:58am by DrBob222

Science
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

chemistry
Calculate the enthalpy of reaction for the combustion of ethene. Express the enthalpy of reaction calculated in question above as a molar enthalpy of reaction per mole of carbon dioxide.
Tuesday, January 8, 2013 at 2:53pm by shyanne

Chemistry
This would be an enthalpy of combustion, not formation. The heat of combustion for decane is 6777.45kJ/mol.
Friday, December 14, 2012 at 8:34am by Dayton

Chemistry
When 0.312g of glucose was burned in a bomb calorimeter (heat capacity 641 J/K) the temperature rose by 7.739 K. Calculate the standard enthalpy of combustion and the standard internal energy of combustion. I've calculated the standard enthalpy but am unsure of how to go about...
Tuesday, September 25, 2012 at 11:39pm by Kalli

Chemistry
When 0.3212g of glucose was burned in bomb calorimeter of calorimeter constant 641J/K, the temperature rose by 7.943 K. Calculate a) the standard molar internal energy of combustion b) the standard enthalpy of combustion and c) the standard enthalpy of formation of glucose. (...
Tuesday, May 4, 2010 at 12:03am by Nadira

chemistry
Determine the enthalpy for the partial combustion of methane to carbon monoxide- 2CH4(g) + 3O2(g) = 2CO(g) + 4H2O(l) from change in enthalpy (CH4,g) = -890. kJ mol-1 and change in enthalpy (CO,g) = -283.0 kJ mol-1
Sunday, September 20, 2009 at 9:21pm by Anna

chemistry
The change in internal energy for the combustion of 1.0 mol of octane at a pressure of 1.0 atm is 5084.3kJ. if the change is enthalpy is 5074.1kJ, how much work is done during the combustion?
Sunday, February 20, 2011 at 8:18pm by Anonymous

chemistry
A 114g sample of sucrose undergoes incomplete combustion according to the reaction C12H22011 + 5O2 ---> 4C + 6CO + 2CO2 + 11H2O using the chart of enthalpies of formation determine the enthalpy released by the sample i think that it is a simple enthalpy problem but in the ...
Sunday, July 25, 2010 at 10:36pm by rick

Chemistry
The thermochemical equation for the combustion of hexane is shown below. 2 C6H14 (g) + 19 O2 (g) → 12 CO2 (g) + 14 H2O (g) ΔH = 8326 kJ What is the enthalpy change for the combustion of 0.650 L C6H14 at STP?
Saturday, October 19, 2013 at 1:48am by Hunter

Chemistry - enthalpy of combustion(help!!!)
i tried using it for CH4, below is my working am i correct? cause i researched a website(cannot post link) and it uses enthalpy of formation!!! i am using the molar enthalpy of formation equation: (ndeltaHf products) - (ndeltaHf reactants) CH4 + 2O2 ↔ 2H2O + CO2 ...
Wednesday, June 8, 2011 at 10:12am by Farah

Biophysical Chemistry
The combustion of 1 mole of C2H5OH (Ethanol) in a bomb calorimeter produces 1364 kJ/mol at 25 degree Calcium. What is the value of enthalpy chamge for the following combustion reaction? C2H5OH(l) + 3O2(g) => 2CO2(g) + 3H2O(l)
Tuesday, December 21, 2010 at 8:33pm by Laura

Chemistry
If the standard enthalpy of combustion of octane, C8H18(l) is -5471 kJ/mol, calculate the enthalpy change when 1.00 kg of octane are burned. the molar mass of octane is 114 g/mol
Saturday, October 20, 2012 at 9:46pm by Sam

Chemistry
The complete combustion of 1.283g of cinnamaldeyde (C9H8O, one of the compounds in cinnamon) in a bomb calorimeter (Ccalorimeter=3.841 kJ/C) produced an increase in temperature of 130.32 C. Calculate the molar enthalpy of combustion of cinnamaldehydy (delta H comb) (in ...
Monday, October 15, 2012 at 1:12am by Amanda

Chemistry
The complete combustion of 1.283g of cinnamaldeyde (C9H8O, one of the compounds in cinnamon) in a bomb calorimeter (Ccalorimeter=3.841 kJ/C) produced an increase in temperature of 130.32 C. Calculate the molar enthalpy of combustion of cinnamaldehydy (delta H comb) (in ...
Monday, October 15, 2012 at 1:51pm by Amanda

Chemistry
The combustion of benzoic acid releases 26.38kJ/g and is often used to calibrate a bomb calorimeter. the combustion of 1.045 g of benzoic acid caused the temperature of the calorimeter to rise by 5.985C. Useing the same calorimeter, a sample of 0.876g of octane (C8H18) was ...
Thursday, October 4, 2012 at 3:23pm by Alisha

Science: Chemistry - Enthalpy
The enthalpy change in the combustion of the hydrocarbon octane is delta H = -5.48 x 10^3 kJ/mol C8H18(l). How much heat, in kilojoules, is liberated per gallon of octane burned? (Density of octane = 0.703 g/mL; 1 gal = 3.785 L.)
Wednesday, June 8, 2011 at 2:00pm by Jackie

CHEMISTRY
AT 25 DEGREES CELSIUS THE STANDARD ENTHALPY OF COMBUSTION OF GASEOUS PROPANE IS -2219.0 KJ PER MOLE OF PROPANE AND THER STANDARD ENTHALPY OF GASEOUS PORPYLENE IS -2058.3 KJ PER MOLE OF P[ROPYLENE. wHAT IS THE STANDARD ENTHALPY CHANGE FOR THE FOLLOWING REACTION C3H6 + H2 ---C3H8
Saturday, July 23, 2011 at 11:32am 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

physical chemistry
A sample of the sugar D-ribose (C5H10O5) of mass 0.727g was placed in a constant volume calorimeter and then ignited in the prescence of excess oxygen. The temperature rose by 0.910K In a separate experiment in the same calorimeter, the combustion of 0.825g of benzoic acid for...
Thursday, February 23, 2012 at 11:46pm by nicole

Inorganic chemistry
The thermochemical equation for the combustion of hexane is shown below. C6H14(g) + 19/2Os(g) ==> 6CO2(g) + 7H2O(g) Delta H = -4163kJ What is the enthalpy change for the combustion of 2.50g C6H14? 2.50 g/86g = .029 mol -4163kJ/.029 = -1.43 x 10^5kJ
Tuesday, May 12, 2009 at 6:43am by Steve

Chemistry
Calculate the enthalpy change per gram for the combustion of ethane (C2H6(g)).
Saturday, December 4, 2010 at 12:35am by Billy

Chemistry practice
Calculate using the enthaly of formation,the enthalpy of combustion of methanol,CH3OH
Sunday, July 31, 2011 at 1:50pm by Gift

Chemistry
Calculate the enthalpy of combustion for acetic acid using standard enthalpies of formation.
Monday, November 12, 2012 at 8:19pm by Diana

Thermochemistry
The enthalpy formation of ethanol, C2H5OH, is -277.0 kJ/mol @ 298.15 K. Calculate the enthalpy of combustion of one mole of ethanol, assuming that the products are CO2(g) & H2O (l).
Monday, April 18, 2011 at 5:16pm by Morgan

Chemistry Help!!
Propane(C3H8), the major component of LP game, is often used as heating and cooking fuels in homes. When propane is burned( reacted with oxygen), CO2(g) and H2O(g) are produced. 1) Write an equation for the reaction and calculate the enthalpy change for the combustion of ...
Wednesday, October 12, 2011 at 1:47pm by Maci

chemistry
Calculate enthalpy change of reaction for the combustion of gaseous ethanol. C2H5OH + 3O2 >> CO2 + 3H2O. Using standard molar enthalpies of formation. C2H5OH -235.3 ( it's negative sign) CO2 -393.5 H2O -241.8 (1) Calculate the enthalpy change of reaction per mole of ...
Tuesday, April 20, 2010 at 10:00am by Alex

chemistry
If someone could see if I have the right answers, and if I don't maybe give me some hints on what to do to get to the right answerr, please. 1. Calculate the heat required to raise the temperature of 150g of water by 25.0C. [For pure water specific heat capacity=4.18Jg^-1K^-1...
Tuesday, November 10, 2009 at 5:24pm by Anonymous

Chemistry
Ammonia (NH3) boils at -33oC; at this temperature it has a density of 0.81 g/cm3. The enthalpy of formation of NH3(g) is -46.2kj/mol, and the enthalpy of vaporization of NH3(l) is 23.2 kJ/mol. Calculate the enthalpy change when 1 L of liquid NH3 is burned in air to give N2(g) ...
Tuesday, April 10, 2012 at 11:40pm by Morgan

chem
The complete combustion of butane, (g) is represented by the equation C4H10+ 13/2O2->4CO2+5H2O standard enthalpy is -2877kj How much heat, in kilojoules, is evolved in the complete combustion of 12.8ml at 23.8degrees celsius and 744mmhg ?
Wednesday, October 8, 2008 at 5:06pm by tomi

Chemistry
Calculate the change in the enthalpy of the reaction. C4H4(g)+2H2(g)===>C4H8(g) Use the following: change in enthalpy of combustion for: C4H4=-2341 kJ mol-1 H2=-286 kJ mol-1 C4H8=-2755 kJ mol-1
Sunday, October 25, 2009 at 9:30pm by Natalie

chem expirement!
You are required to design an experiment to test Hess's law using the combustion of ethanol. Write a brief design for this experiment. What I wrote as my answer: Hess Law: is the algebraic addition of chemical equations yields a net equation whose enthalpy of reaction is the ...
Thursday, May 17, 2007 at 12:28pm by rob

chem
The complete combustion of 1.283g of cinnamaldeyde (C9H8O, one of the compounds in cinnamon) in a bomb calorimeter (Ccalorimeter=3.841 kJ/C) produced an increase in temperature of 130.32 C. Calculate the molar enthalpy of combustion of cinnamaldehydy (delta H comb) (in ...
Monday, October 15, 2012 at 3:10pm by greg

Gen Chem
If the standard enthalpy of combustion of octane, C8H18(l) is -5471 kJ/mol, calculate the enthalpy change when 1.00 kg of octane are burned. the molar mass of octane is 114 g/mol
Saturday, October 20, 2012 at 9:39pm by Sam

Gen Chem
If the standard enthalpy of combustion of octane, C8H18(l) is -5471 kJ/mol, calculate the enthalpy change when 1.00 kg of octane are burned. the molar mass of octane is 114 g/mol
Saturday, October 20, 2012 at 9:39pm by Sam

chem experiment:
You are required to design an experiment to test Hess's law using the combustion of ethanol. Write a brief design for this experiment. What I wrote as my answer: Hess Law: is the algebraic addition of chemical equations yields a net equation whose enthalpy of reaction is the ...
Thursday, May 17, 2007 at 11:23am by rob

Chemistry
Find the enthalpy for : 4Fe + 3O2 = 2Fe2O3 I got the following informations: Fe + 3H2O = Fe(OH)3 + 3/2H2 - Enthalpy is 160.9 kj H2 + 1/2O2 = H2O - Enthalpy is -285.8 kj Fe2O3 + 3H2O = 2Fe(OH)3 - Enthalpy is 288.6 I try using Hess Law but cannot solve it. Can anyone help me ...
Monday, May 13, 2013 at 2:37pm by Shadow

Chemistry
Calculate the enthalpy of combustion of acetylene(per mol acetylene)using bond enthalpies and energy diagram
Friday, August 5, 2011 at 2:15pm by Gift

Chemistry
Calculate the enthalpy of combustion of acetylene(per mol acetylene) using bond enthalpies and energy diagram
Friday, August 5, 2011 at 6:20pm by Gift

Chemistry
The sugar arabinose, C5H10O5, Molar Mass = 150.15 g/mole, was completely combusted with excess oxygen in a calorimeter. Combustion of a 0.548 g sample of arabinose caused the temperature to increase from 20.00 degrees C to 20.54 degrees C in a calorimeter with a total heat ...
Wednesday, November 2, 2011 at 11:11pm by Anonymous

12 Chemistry
What is the molar enthalpy of combustion of magnesium? This was the lab question that I was asked to find after performing a lab based on Hess' law. I can't find anywhere in my notes how to calculate this, and the text book doesn't explain their steps properly, and I have ...
Saturday, March 29, 2008 at 10:58am by Chase (sorry if this long)

addition Chemistry
the enthalpy -414kJ/mol is the enthalpy of combustion. i.e. how much energy released for one mole of Na metal to burn in air. so the actual equation is; Na + 1/2O2 --> NaO ?H = -414kJ/mol. However, the equation given in your question is written in whole number coefficients ...
Wednesday, June 5, 2013 at 9:55pm by bonjo

chemistry
given C12H22O11+H2O----C6H12O6+C6H12O6 heat combustion 0f 2815.8 kj/mol what is the standard enthalpy
Tuesday, April 19, 2011 at 8:36pm by yr

chem
The complete combustion of butane, (g) is represented by the equation C4H10+13/2O2->4CO2+5H20 STANDARD ENTHALPY IS -2877KJ/MOL How much heat, in kilojoules, is evolved in the complete combustion of 12.8L C4H10 at 23.8degrees celsius and 744mmhg ?
Wednesday, October 8, 2008 at 5:15pm by tomi

chemistry
Upon complete combustion, the indicated substances eveolve the given quantities of heat. Write a balanced equation for the combustion of 1.00 mol of each substance, including the enthalpy change, H, for the reaction. a) 0.548g of propane, C3H8(g), yields 29.4 J b) 2.35 mL of ...
Monday, December 8, 2008 at 11:25pm by Mel

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?
Wednesday, February 15, 2012 at 12:52pm by werksow

Chemistry - Enthalpy reactions
What is the reaction enthalpy for CaCO3(s) --> CaO(s) + CO2(g)? should i be using a enthalpy reaction table?
Wednesday, February 29, 2012 at 8:48pm by Rose Bud

Chemistry
Write equations for the following reactions: the combustion of propane the incomplete combustion of propane to for CO and water the complete combustion of 8,8-dimethylpropane in oxygen
Sunday, December 5, 2010 at 12:26pm by Amanda

Chemistry
Calculate the enthalpy change (delta H) in kJ for the following reaction. 2Al(s) + Fe2O3 (s) ==> 2 Fe(s) + Al2O3(s) use enthalpy changes for the combustion of aluminum and iron. 2Al(s) + 3/2 O2(g) ==> Al2O3(s) Delta H: -1669.8 kJ 2Fe(s) + 3/2 O2(g) ==> Fe2O3 (s) Delta...
Sunday, May 23, 2010 at 6:09pm by Kim

Chemistry
Calculate the enthalpy change (delta H) in kJ for the following reaction. 2Al(s) + Fe2O3 (s) ==> 2 Fe(s) + Al2O3(s) use enthalpy changes for the combustion of aluminum and iron. 2Al(s) + 3/2 O2(g) ==> Al2O3(s) Delta H: -1669.8 kJ 2Fe(s) + 3/2 O2(g) ==> Fe2O3 (s) Delta...
Sunday, May 23, 2010 at 9:53pm by Kim

chemistry
Using standard heat of formations. (Appendix II in text). Calculate the standard enthalpy change for the combustion of methane. CH4 (g) + 2 O2 --- 2CO2(g) + 2H2O (l) H0 = ?
Tuesday, March 6, 2012 at 12:00pm by chris

Chemistry - Enthalpy change and stoichiometry
N2 + O2 = 2NO enthalpy change = +180.6kJ c) what is the enthalpy change for the formation of one mole of nitrogen monoxide? d) What is the enthalpy change for the reaction of 1.000 * 10^2g of nitrogen with sufficient oxygen? I do not understand how to calculate the above, can ...
Wednesday, February 23, 2011 at 5:26am by Farah

Chemistry
The combustion of 132 g of propane, C3H8, with excess oxygen liberates 6.6x10^3 kj of heat. What is the enthalpy change for the reaction below: C3H8(g) + 5O2(g) -> 3CO2(g) + 4H2O(l)
Sunday, October 14, 2012 at 2:14pm by Kay

chemistry
The standard enthalpy of combustion of C2H6O(l) is -1,367 kJ mol-1 at 298 K. What is the standard enthalpy of formation of C2H6O(l) at 298 K? Give your answer in kJ mol-1, rounded to the nearest kilojoule. Do not include units as part of your answer. Note: The standard ...
Saturday, March 1, 2014 at 6:27pm by abby

Chemistry practice
Using the form of energy diagram,make a concept map of the two different methods of calculation of reaction enthalpy(via the bond enthalpy and via the enthalpy of formation)
Sunday, July 31, 2011 at 2:01pm by Gift

chemistry
molar enthalpy of combustion for pentane? Mass C5H12= 2.15g Mass H2O= 1.24kg Initial temp= 18.4C Final temp= 37.6C
Thursday, January 10, 2013 at 2:56pm by shyanne

Chemistry
Firstly, is this right?: Exothermic reactions have a negative enthalpy change value because the enthalpy of the reactants are greater than the enthalpy of the products *since the reactants have weaker bonds.* (especially the starred part, I'm wondering about) If so, how come ...
Monday, February 18, 2013 at 11:24pm by a Canadian

chemistry
From the following information, calculate the standard change of enthalpy for the combustion of coal. C + O2 -> CO2 COMPOUND HEAT OF FORMATION coal 0.0 carbon dioxide -393.5 water (l) -285.9 oxygen 0.0
Sunday, July 15, 2012 at 11:29am by Annabelle

IB Chemistry
I based on the formular to calculate enthalpy change is equal to the bond enthalpy total for the reactants subtracting from the bond enthalpy for products.Hence,if the reaction is endothermic,then the bond enthalpy total for the reactants is greater than for the products
Thursday, February 28, 2013 at 11:57pm by chirikamo

chemistry
From the following Information, calculate the standard change of enthalpy for the combustion of coal. SHOW WORK AND BALANCED REACTION!!! Compound DeltaHf (kj/mol) Coal 0.0 Carbon dioxide -393.5 Water (l) -285.9 Oxygen 0.0
Tuesday, June 12, 2012 at 9:29am by Chloe

chemistry
From the following Information, calculate the standard change of enthalpy for the combustion of coal. SHOW WORK AND BALANCED REACTION!!! Compound DeltaHf (kj/mol) Coal 0.0 Carbon dioxide -393.5 Water (l) -285.9 Oxygen 0.0
Tuesday, June 12, 2012 at 9:33am by Chloe

chemistry
I think you are right although the question (and your answer) implies that we know the absolute enthalpy and we never know that. We can measure the change in enthalpy but we can't measure the absolute value of the enthalpy. That's why we have an arbitrary standard.
Wednesday, February 27, 2008 at 4:17pm by DrBob222

Chemistry
But that would happen AFTER a reaction... Why would a reaction end up being expthermic if, originally, the enthalpy of the reactants are greater than the enthalpy of the products. And also, why do weaker bonds have more enthalpy/energy?
Monday, February 18, 2013 at 5:47pm by a Canadian

chemistry
The enthalpy of combustion of carbon to carbon dioxide is -394 kJ according to the equation: C (s) + O2 (g) --> CO2 (g) How many kJ of heat are released when 24.0 g of carbon are burned in an excess of oxygen
Saturday, June 11, 2011 at 10:50pm by lo

Chem
What is an experimental technique that could be used to determine the enthalpy of combustion of magnesium directly? Not using Hess's Law!! any help is appreciated :)
Sunday, November 23, 2008 at 10:33pm by z.

Chemistry
The combustion of carbon monoxide is represented by the equation below: CO (g) + 1/2O2 (g) ----> CO2 (g) a) determine the value of the standard enthalpy change, for the combustion of CO at 298 K using the following info. C (s) + 1/2 O2(g) ----> CO (g) delta H at 298K = -...
Tuesday, October 9, 2007 at 5:32pm by Nick

Chemistry
The enthalpy change in the combustion of the hydrocarbon octane is delta H = -5.48 x 10^3 kJ/mol C8H18 (l). How much heat, in kilojoules, is liberated per gallon of octane burned? (Density of octane = 0.703 g/mL; 1 gal = 3.785 L.)
Wednesday, June 8, 2011 at 12:24pm by Jackie D

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

chem 101
Biphenyl (C1 2H1 0) burned in a bomb calorimeter in order to determine its heat of combustion. The heat capacity of the calorimeter was 5.86 kJ/C When 0.514 g of biphenyl was burned, the temperature of the calorimeter increased from 25.8 C to 29.4 C. Determine the enthalpy ...
Wednesday, April 11, 2012 at 3:34pm by Anonymous

chemistry
give enthalpy profile diagrams to illustrate endothermic and exothermic reactions. include an explanation of cocepts such as enthalpy change, activation energy and catalysts.explain how the process of bond breakage and formation determine the enthalpy change of a reaction ...
Wednesday, February 2, 2011 at 12:24am by ABRAHAM

Chemistry
So if you find the enthalpy change for one reactant, it's the enthalpy change for the other reactant (and products??), i.e. you know the enthalpy change for the entire reaction? So enthalpy change of one reactant (or product also?) = enthalpy change of entire reaction?
Wednesday, February 20, 2013 at 7:38pm by a Canadian

chemistry
The enthalpy of combustion of benzoic acid,C6H5COOH, which is often used to calibrate calorimeters, is -3227kJ/mol. When 1.236g of benzoic acid was burned in a calorimeter, the tempurature increased by 2.345K. What is the specific heat of the calorimeter?
Sunday, November 2, 2008 at 11:09pm by annemarie

chemistry
The peanut studied had a mass of 0.609 g before combustion and 0.053 g after combustion. The energy released during combustion caused a 14.2 degree Celsius increase in the temperature of 200.0 mL water in the calorimeter. Calculate the mass of peanut burned.
Thursday, August 30, 2012 at 12:20am by Lauren

chem 101
Biphenyl (C1 2H1 0) burned in a bomb calorimeter in order to determine its heat of combustion. The heat capacity of the calorimeter was 5.86 kJ/C When 0.514 g of biphenyl was burned, the temperature of the calorimeter increased from 25.8 C to 29.4 C. Determine the enthalpy ...
Sunday, April 15, 2012 at 2:44pm by Anonymous

Chemistry
Which of the following is the best definition of Hess' Law? A. Heat is always released by the decomposition of 1 mole of a compound into its constitute elements. B. The enthalpy of a process is the difference between the enthalpy of the products and the enthalpy of the ...
Wednesday, February 20, 2008 at 1:49pm by Anonymous

Chemistry
calculate the enthalpy change for: (enthalpy of formation of aqueous sodium hydroxide is -469.60 kJ/mol. enthalpy of formation of liquid water is -285.8 kJ/mol) 2Na + 2H2O = 2 NaOH + H2
Thursday, January 31, 2013 at 9:09am by Annie

chemistry-URGENT
Hydrazine is used as a rocket fuel. When 1.50 g of hydrazine, N2H4, was burned in a bomb calorimeter, temperature increased from 23.57 C to 28.84 C. The heat capacity of the calorimeter was 5.510 kJ/C. Determine the enthalpy of combustion of octane.
Sunday, April 10, 2011 at 7:59pm by Maria

college chemistry
The enthalpy of combustion of benzoic acid,C6H5COOH, which is often used to calibrate calorimeters, is -3227kJ/mol. When 1.236g of benzoic acid was burned in a calorimeter, the tempurature increased by 2.345K. What is the specific heat of the calorimeter?
Monday, November 3, 2008 at 5:33am by annemarie

Chemistry practice
Glycine is the amino acid used to make proteins a)for each mole of glycine that burns,973.49k/mol of which is libarated eqution and the values of delta Hf^o for the products of combustion to calculate the enthalpy of formation for glycine.Represent your working on the energy ...
Friday, August 5, 2011 at 6:31pm by Gift

chem 101
Biphenyl (C1 2H1 0) burned in a bomb calorimeter in order to determine its heat of combustion. The heat capacity of the calorimeter was 5.86 kJ/C When 0.514 g of biphenyl was burned, the temperature of the calorimeter increased from 25.8 C to 29.4 C. Determine the enthalpy ...
Wednesday, April 11, 2012 at 3:35pm by Anonymous

Chem
The entropy of combustion of benzoic acid is zero. This means that... a)combustion is not spontaneous here. b)combustion is spontaneous, however, since the reaction is exothermic. c)combustion is spontaneous, however, since the reaction is endothermic. d)combustion is ...
Monday, March 31, 2008 at 7:45pm by Ginger

chemistry
Use bond energies to predict the molar enthalpy of combustion of acetylene gas. 2C2H2 + 5O2--> 4CO2 + 2H2O I am confused as to how to do the 2C2H2 in relation to the bonds? how many c-c bonds would there be, or would they be triple bonds?
Monday, October 11, 2010 at 2:02pm by ben

Chemistry
In a bomb calorimeter, a 6.50 g sample of octane (C8H18) is combusted. The combustion enthalpy for octane is -5.45 MJ per mol C8H18. The temperature change of the calorimeter is 16.5 oC. What is the heat capacity of the calorimeter?
Friday, March 14, 2014 at 3:09pm by Mary

Chemistry
I'm trying to calculate the enthalpy of the reaction Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2 (g) however I cannot find the enthalpy of the compound MgCl2 (aq) and I cannot calculate the total enthalpy without it
Sunday, March 27, 2011 at 10:13pm by Kirstie

Chemistry
O3 + NO --> O2 + NO2 (all in gas state) Calculate the change in enthalpy for the reaction at room temp. using the following data ^Hf: O3 = 143 NO = 90 NO2 = 33 So, I have 143+90--> X + 33. I don't know what the enthalpy of O2 is. I assume you simply subtract the enthalpy...
Monday, February 18, 2008 at 6:56pm by Anonymous

Chemistry
I'm basically trying to explain why, in exothermic reactions, enthalpy of the products are greater than the enthalpy of the reactants (resulting in a negative enthalpy change). And I obviously don't know myself. Can someone please explain? I can't seem to find the answer ...
Sunday, February 17, 2013 at 7:30pm by a Canadian

Chemistry
Pentane is a small liquid hydrocarbon, between propane and gasoline in size C5H12. The density of pentane is 0.626g/ml and its enthalpy of combustion is ΔHcomb =-3535kj/mol. Estimate the fuel valve and the fuel density of pentane.
Thursday, November 8, 2012 at 8:05pm by Brittany

Science
The biochemical conversion of Glucose, C6H12O6, into pyruvic acid, C3H4O3, is an important step in the TCA (Krebs) cycle which forms a part of the metabolic breakdown of glucose (to produce energy). C6H12O6 (s) + O2 (g) → 2C3H4O3(l) + 2H2O (l) glucose oxygen pyruvic ...
Saturday, October 22, 2011 at 11:06am by Tammy

Chemistry
If the standard enthalpy of formation of PH3(g) is +5.4 kJ mol-1, calculate the reaction enthalpy for 2PH3(g)--->2P(s)+3H2(g)
Saturday, October 20, 2012 at 11:23pm by Sam

Chemistry
Which of the following is the best definition of Hess' Law? A. Heat evolved in a given process can be expressed as the sum of the heats of several processes that, when added, yield the process of interest. B. The enthalpy of a process is the difference between the enthalpy of ...
Monday, May 7, 2007 at 12:45am by Jared

Chemistry
enthalpy of combustion kj mol H2 + 1/2 o2 = h20 + 286 kJ how much did you see? 62.4 ml H2 1 mol of any gas at NTP = 24.5 L You need to clarify your question. Also define NTP.
Thursday, March 8, 2007 at 10:49pm by San

chemistry
use the following data to calculate the mean bond enthalpy values for the C-H and C-C bonds. CH4(g)-C(g) + 4H(g) standard enthalpy change is +1648 kj/mol C2H6(g)-2C(g) + 6H(g) standard enthalpy change is +2820 kj/mol
Friday, February 22, 2013 at 8:04am by Bliss

Chemistry
Reposted: Use Hess's law to calculate the enthalpy change for the reaction: 3C(s) + 3H2(g) yield C3H6(g) Given the following thermochemical equations: 2C3H6(g) + 9O2(g) yield 6CO2(g) + 6H2O(l) enthalpy change= -4116.0 kJ/mol C(s) + O2(g) yield CO2(g) enthalpy change= -393.51 ...
Saturday, March 17, 2012 at 11:11am by Hailee

chemistry - Molar enthalpy
When 10.0 g of KOH is added to 100.0 g water, the solution's temperature increases from (25.18 C) to (47.53 C). What is the molar enthalpy of solution for KOH? i tryed q=(m)x(c)x(delta T) didn't really work. i got 22.35 J do i use that to find the molar enthalpy if so how?
Wednesday, February 29, 2012 at 9:58pm by Rose Bud

Chemistry
Which of the following is the best definition of Hess' Law? A. Since enthalpy is a state function, it will be different if a reaction takes place in one step or a series of steps. B. Heat is always released by the decomposition of 1 mole of a compound into its constitute ...
Sunday, February 24, 2008 at 7:01pm by Anonymous

Chemistry
An experimental spacecraft consumes a special fuel at a rate of 2.10 102 L/min. The density of the fuel is 0.690 g/mL and the standard enthalpy of combustion of the fuel is 39.8 kJ/g. Calculate the maximum power (in units of kilowatts) that can be produced by this ...
Saturday, April 21, 2012 at 6:12pm by Jematormal91

Chemistry
You have 210 L/min Convert that to L/sec, use density to convert to g/sec and convert that to kJ/sec with enthalpy of combustion. Won't that answer be in kJ/sec = KW.
Saturday, April 21, 2012 at 6:12pm by DrBob222

Chemistry
"Translate the empirical molar enthalpy given below into a balanced chemical equation, including the enthalpy change (delta H): The standard molar enthalpy of formation for carbon disulfide is 89.0 kJ/mol" I got delta H = 178 kJ (is that right?). However, I'm having trouble ...
Friday, February 12, 2010 at 4:18pm by Stuck

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