Combustion Definition and 348 Threads

Homework Statement Gasoline consists primarily of octane, C8H18 Calculate the mass of CO2 produced from the complete combustion of 3.79 L (1.00 gallon) of gasoline (assume octane, density = 0.756 g/mL) with excess O2 The Attempt at a Solution The balanced chemical formula would be: 2C8H18 +...

Homework Statement A sample of gaseous substance composed of only hydrogen and boron, underwent combustion with excess oxygen. As a result, all the hydrogen turned into water, and all the boron turned into B2O3. a) find the empirical formula of the substance? b) find the chemical formula...

Homework Statement We discussed the fact that the formation of some trace gases is thermodynamically unfavorable at low temperature, but more favorable at elevated temperatures. Using the values for delta G and delta H in the notes, calculate the equilibrium partial pressure of NO2 during...

How much heat, in kilojoules, is evolved in the complete combustion of 1.325 g C4H10(g) at 23.6 degrees Celsius and 738 mmHg? The complete combustion of butane is represented by this equation C4H10(g) + \frac{13}{2} O2(g)\rightarrow 4CO2(g) + 5H2O(l) \DeltaH degrees Celsius = -2877 kJ I...

Homework Statement Using the data for the combustion of 3-pentanol calculate the molar enthalpy for the alcohol. Initial mass of alcohol: 27.35g Final mass of alcohol: 26.41g Change in temperature: 21.0C Volume of water: 100.0mL (100.0g) Specific heat capacity of water: 4.18 J/gC...

I am sure someone wrote with great detail on the subject, but i just can't seem to find it in the forums... I want to know about the parameters influencing the performance of an IC engine...obviously, not all parameters, but those we can conviently control specifically...how is bore/stroke...

Homework Statement integrate [(rs^2)*(rhos)*(us)*(db/dr)=(d/dr)*(r^2)*(rho)*(D)*(db/dr))] rs=radius at surface rhos=density at surface us=velocity at surface r = radius rho = density D= diffusivity b=spalding non-dimensional parameter Homework Equations The Attempt at a...

Homework Statement I want to figure out what pressure would need to be applied onto a 5% methane 95% air mixture to heat it up to the autoignition temp of 853 K. Homework Equations ? The Attempt at a Solution

hi, I'm wondering what happens when you burn a liquid fuel in a combustion chamber, eg. suppose you've got octane (C8H18) and you're using air as the comburent, but the equivalence ratio is less than one, so that not all the octane can get used up... Does the 'left over' octane come out of the...

Can pure oxygen be used in internal combusion gas or diesel engines? If no, what percentage could be used?

hello, i was wondering what people here would think the best design type for a potato launcher would be. I looked at catapults, ones that use compressed gas, and combustion. firstly, which would be the easiest to make?

1. Calculate heat of combustion for butane. Given: mass water- 129.91g mass butane 0.15g old temp- 16.4 degrees C new temp.- 26.7 degrees C 2. Homework Equations 2C4H10 + 3O2 yields 8CO2 + 10H2O 3. The Attempt at a Solution I've tried, but I really have no idea. I only know...

Homework Statement I'm supposed to find the heat of combustion for candle wax (which was used to boil water in a simple calorimeter), yet I have no clue on how to do it, the lab books at school do not tell anything about the calorimeter's specific heat or give a formula for heat of combustion...

1. Homework Statement In a calorimeter, a 1.0g sample of magnesium is burned to form MgO. In doing so, 25.5 kJ of energy is released. The molar enthalpy of combustion of magnesium is: a) -0.0392 kJ/mol b) -25.5 kL/mol c) -306.2 kJ/mol d) -620 kJ/mol Homework Equations Q= mc...

Hi, I am learning about the above at the moment and was wondering when the reaction equations are given or you have worked these out, are they in kg or kmol. I have looked at mixtures and know how to go between the two when given the ultimate or gravimetric analysis but am unsure when I have...

What's the formula for calculating this, given: grams, heat capacity of substance, and temperature change? How about heat combustion per kJ/Mol? Thanks

specific heat of combustion?? help Homework Statement Chemical Properties of gasoline components Using C5 to C10 hydrocarbons, conduct an experiment to determine the effect of one property of the hydrocarbon on the specific heat of combustion. Homework Equations The Attempt at a...

Hello, I know that something around 65% of the potential energy stored in fuel is lossed in an engine through heat. I am trying to find exactly how its lossed, I know some is through piston friction, and some is lossed through the exhost, but I can't find how much is lossed for each...

Has anyone ever researched what contribution, if any, the actual combustion of fossil fuels contributes to global warming? If you added up all the BTU's of energy which have been released in the last few decades, would it add up to something or is it negligible? Of course, all motion due to...

Something made me think today, are there any catalysts for combustion? I know it depends on the fule (such as hydrocarbons) but I wanted to leave this open to any kind of fule - I was just interested if there are catalysts for combustion and if so, what fule and what are the catalysts...

2 question I don't get ... =\ any help would be appreciated. I don't even know where to start ... Homework Statement 2. A sample of a hydrocarbon is combusted completely in O2 to produce 21.83 g CO2, 4.47 g H2O and 311 kJ of heat. A) What is the mass of the hydrocarbon sample that was...

Homework Statement ok so I'm trying to find the change in enthalpy for this reaction: Mg(s) + (1/2)O2--> MgO(s) I've done the lab to find the temperatures of certain reactions, these were: 9.70 Celsius for the reaction Mg(s) + 2HCl(aq)--> MgCl2(aq) + H2(l) 7.60 Celsius for the reaction...

Homework Statement Finding the heat of combustion of magnesium.Homework Equations 1.) MgO(s) + 2HCl(aq) → MgCl2(aq) + H2O(l) ∆Hr = 1047.61KJ/mol *This value was found experimentally 2.) Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) ∆Hr = 374.36KJ/mol*This value was found experimentally 3.)...

Homework Statement Calculate the heat of combustion per mole of glucose(s), C6H12O6(s). This is the only information given. There is no Hess' law equations or any of the sort. Homework Equations The Attempt at a Solution I already know the answer is roughly -2813kJ/mole but I...

As part of my introductory engineering class this year, I have to work with a group to build a small vehicle (no bigger that 2ftx2ftx3ft) that can carry some water up to 250 ft. However, we cannot use any electricity, anything flammable or solid rockets. So right now I'm at a loss as to how to...

Does anyone have view windows which they installed on their combustion chamber? My team and I are going to install quartz windows on 304 stainless steel, and so far the coefficients of thermal expansion look really different. We are also debating on the shape of the windows. Any hints would...

I was given to complete and balance the complete combustion of C5H12 I did this by adding O2 so it would be combusted and got: C5H12 (g) + 8O2 (g) --> 5CO2 (g) +6H2O (g) is this correct? thanks.

Good evening all, I was wondering if anyone would be able to point me in the right direction to equations in regards to designing a proper combustion chamber for a rocket engine, as well as for the throat/De Laval nozzle as well. I've looked around and I can't seem to find anything that...

Hi all, new guy here. I am trying to understand the laws that govern a diesel motor. I know it compresses air at about 17 to 1 to ignite the fuel and I think that fuel will expand the air in the chamber at about 5 times the volume consistently (from tdc to end of stroke). I am trying to figure...

Are these statements fair and true? Water is one of two products of the combustion of hydrogen. Flame is in part a visual manifestation of a collapse in energy state. Heat is a radiant manifestation of a collapse in energy state. The deeper the collapse in energy state the lower the...

Rate of combustion?? Homework Statement 1. The broader side of a rectangular fiberglass of dimensions 3m x 5m is brought near the flame. The flame is produced upon combustion of gasoline. If the rate of combustion is 0.002 g/s, determine the minimum thickness of the fiberglass so that the...

Hi, Could you please confirm these estimations for me: Knowing that the Energy of Combustion of CH4 is 50.1 KJ/Kg, and that the specific heat for the CO2 at 273.15 K is approximately 0.81 KJ/Kg*K; please, could you confirm that in order to increase the temperature of 1 liter of gas of CO2...

Hi, this is my first question, and I'm working on some summer work with a friend and we stumbled upon this problem. Homework Statement A sample of LSD is added to table salt (sodium chloride) given that a 1.00 g sample of a mixture undergoes combustion to reduce 1.20g of CO2, what is the mass...

I had a question on how to find the stoichimoteric coefficient in combustion reaction contains several types of natural gas. Lets say for example: u start with a natural gas (using moral analysis) 0.865CO2 + a0.08C3H8 + b0.02C3H8 c0.035N2 + d(O2 + 3.76) ------> eCO2 + fH20 + gN2; Using...

If i am trying to burn a fuel in air am i right in saying if i have a higher temerature compared to a lower temperature of air, the higher temperature air has more moles of air to burn than the lower temperature air for complete combustion to occur?

Hey Y'all, As some of you might know I do combustion research I took high speed images of a spherically expanding flames. Look what happens at high pressure. The flame brakes up into cells. Is there anybody that is a photo expert and that can give me advise on how to improve these images...

This is an attempt to calculate the efficiency of a modern gasoline engine (Volkswagen's 1.6 litre FSI). The result seems too good to be true. Please let me know if there is any error. At a constant 100 km/h on a flat motorway, the consumption of my car reads 5.7 l/100 km. The engine revs...

An internal combustion engine runs on octane, the enthalpy of combustion is -5512 kJ/mol. The mass of 1 gallon of fuel is 3 kg. The engine temperature is 2000 degrees C and the exit temperature is 800 degrees C. What is the work done? The total enthalpy is -145053 kJ. The total number of...

For a project in my combustion class, I have to do a review paper on an area of combustion research. I don't know a lot about this field or the technologies that are at the forefront, so I was hoping the people on this board could help me out. I'm kind of a sci-fi geek, so I would like...

Combustion reaction -- discrepancy between hand calc. and computer sim I am considering the reaction C2H4O (liquid) --> CO + 0.5CH4 + 0.5H2 + 0.25C2H4 I calculated the flame temperature when the reactant is at 298 K and 20 atm using H(reactants) = H(products) to get Tfinal = 945 K. I then...

Homework Statement Calculate the flame temperature of normal octane (liquid) burning in air at an equivalence ration of 0.5. All reactants are at 298 K and the system operates at the pressure of 1 atm. Homework Equations Hp = Hr The Attempt at a Solution I know that the...

[SOLVED] What is the enthalpy of combustion of magnesium? Homework Statement Determine the enthalpy of combustion of Magnesium. Mg + 1/2O2 --> MgO magnesium + half oxygen -> magnesium oxide. The Attempt at a Solution I am not sure how to calculate this since I don't know where...

Hey. We have an assignment where we're investigating combustion of types of 'fuels'. I chose 4 alcohols- ethanol, methanol, propanol and octanol. I did a few experiments, with one testing the heat produced Could you please explain the formula for the heat value- not quite sure what its...

Homework Statement How many grams of methane (CH4 (g)) must be combusted to heat 1,200 grams of water from 26.0 degrees Celsius to 87.0 degrees Celsius, assuming water is in liquid state as a product and 100% efficiency in heat transfer? Given data: mass of H2O = 1.20 kg specific heat...

what is needed for combustion? I have this experiment NH4NO3 reacts to form (with chlorine as catalyst) N2O and water the experiment is called oxidation of zinc, so another equation is Zn and NH4NO3 react to form ZnO and water. Anyways, the result is a blue flame and smoke Combustion...

what is needed for combustion? I have this experiment NH4NO3 reacts to form (with chlorine as catalyst) N2O and water the experiment is called oxidation of zinc, so another equation is Zn and NH4NO3 react to form ZnO and water. Anyways, the result is a blue flame and smoke Combustion...

Homework Statement When 2.66 grams of a compound containing only carbon, hydrogen, and oxygen is burned completely, 4.50 grams of CO2 and 1.10 grams of H2O are produced. What is the empirical formula of the compound? Answer Options: C5H6O4 C5H6O5 C5H12O5 C4H6O3 C4H8O3 C3H4O3 C4H4O5...

Enthalpy of Combustion -- Alkanes Write a balanced equation for the combustion of CH4(g) (methane) (its reaction with O2(g) forming the products CO2(g) and H2O(l)). Given the following standard heats of formation: \DeltaHf° of CO2(g) is -393.5 kJ/mol \DeltaHf° of H2O(l) is -286 kJ/mol...

How can I design an internal combustion engine especially with connecting rod?

I was thinking. Now people plan to build factories to transform wood to liquid fuels. But why not run a motor on solid fuel. A diesel spread diesel to a fine particle dust so it burn faster and better. But you can get a explosion by sawdust. Is it not possible to get sawdust into the...