Reaction Definition and 1000 Threads

Since the heat of formtion of H2O is -285.8 and the heat of formation of CO2 is -393.5 I thought that the heat of reaction CH4 + 2O2 should be -393.5 + 2(-285.80 = -965.1 Where am I wrong?

we assume that we have an exergonic reaction , a substrate going to a product , is the negative ΔG′° the principal reason that the equilibrium favors the product (there is more product than substrate at equilibrium )?, or it is not and that depends on other factors? , thanks .

Could I ask for a hint as to where to go next with this question please? I've done this first part, to find the reaction on the wall. Here's my diagram: I've labelled the internal forces at B in red. In green I've shown the reaction at the ring. So I need to find sqrt(Rx^2 + Ry^2) = R. So...

Hello All : Good day : i found a small magnet and it reacted strangely with my body , the magnet is 5 mm in diameter , and less than 4 mm thickness , i rob it few times on my left hand vain it stuck , which i do not understand why ! i checked on other people about 3 one of them had the same...

$$ \begin{array}{c} \mathrm{HA}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \mathrm{A}^{-}+\mathrm{H}_{3} \mathrm{O}^{+} \\ \mathrm{K}=\dfrac{\left[\mathrm{A}^{-}\right]\left[\mathrm{H}_{3} \mathrm{O}^{+}\right]}{\left.[\mathrm{HA}] \mathrm{H}_{2} \mathrm{O}\right]} \quad...

So I'm designing a proces where carbondioxide is converted into methane using the Sabatier reaction. For this reaction hydrogen is required which I'm planning on producing using the electrolysis of water. But I'm having a problem where I need the speed of this reaction to determine the size of...

Here is the image the answer is say 100 but why. Why isn't it 0. Is it because of the pulley but even with the pulleys the tensions in both ropes are 100 N.

I was thinking to react Aniline with Br2 in presence of Ch3ch2-Oh But I don't know the mechanism also I'm confuse will this really give the desired product In my textbook, they reacted aniline first with an aldehyde and then with bromine water, and then with H+ to get Desired product .. I want...

I have this question in my biomechanics class, and the way the teacher has solved it raised some questions with me. This is the snippet of work from the lecture slides: But, if we see the red variables acting as 'placeholders' for the value of respective forces, and the value of the force at...

So I am trying to understand how to estimate the amount of deflection [D] the vertical beam shown above would experience if the base it is attached to is accelerating at a constant acceleration [a] of 9.81 m/s. I assume the Force [F] would be equal to weight of the vertical beam (mass x...

The law of action and reaction is the explanation that I see everywhere. But I can't find anywhere what exactly pushes the balloon in the opposite direction as the air coming out. Air molecules come out to where pressure is less. What exactly moves the rubber balloon in the opposite direction...

How did you find PF?: Social media Hello there good people, I would like to know what is the product of the reaction between marquis reagent and ibuprofen? CH2O is Formaldehyde, SO4 is Sulfuric Acid and C13H1802 is ibuprofen The reaction is CH2O + SO4 + C13H1802 = ?? I was wondering what...

Man this is killing me (figuratively I hope). I know I’m whinging, but I rarely get sick, and here I am experiencing full on flu symptoms along with a slightly discomfortable chest after the 2nd Pfizer. In addition to the sore arm. Being sick sucks, especially when it’s fake sickness meant to...

Summary:: The question requires us to determine the member forces using method of joints but I couldn’t figure out how to calculate the support reaction forces I tried to use equilibrium equations to solve the question but the force applied will be canceled out, and eventually the reaction...

For electrochemical energy devices such as batteries or fuel cells working reversibly, efficiency is defined as: η=ΔrG⦵/ΔrH⦵ Since cell operates reversibly Gibbs energy change of the system is equal to electrical work done by the cell, so we can instead just use standard Gibbs energy of...

I remember when I was in high school, heat was very often said to be a factor of speeding up chemical reactions that we all know, because heat is actually energy, energy will excite the molecules and make them easier to collide with other molecules or leave its own molecules (breaking bond)...

Today I learned that U 235 is not a German Uboat

Hi, I have to determine the reaction mechanism of this molecule. Can someone please explain to me why the reaction would occur on OH (A)? Is it bc you can't have 2 pi bonds next to each other and OH(A) is the only polarised bond in the molecule where it would easily break off and form a double...

I am trying to understand the reaction of a steel coil compression spring when pulsed. The spring I am interested in has the following physical characteristics: k (spring constant in pounds per inch) = 2.88 d (wire diameter in inches) = .043 n (number of active coils) = 29 D (mean diameter of...

Hi, I was attempting the following question and don't know how to find the 'reaction rate': "For the reaction the following stoichiometric coefficients have been determined: 2 ##C## react to form 2 ##E## and 1 ##F##. The rate of formation of E is ##1.6\times10^{–4} mol L^{–1} s^{–1}##. What is...

Hey, I have this equation in which I have to determine its reaction mechanism. I managed to determine how we managed to obtain this the molecule in the picture above, but I don't understand the mechanism behind obtaining the second alkene. Thank you so much for your help, and sorry if the...

(This added about a month after this thread opened: It turns out I'm a real outlier for side effects to the vaccine, so don't let this post scare you off. My wife says every time I catch a cold or something that it hits me hard. Of course to me that is 'normal.' :doh:) A few days ago a...

My solution and question are in the homework statement due to some formatting issues. Thanks.

I think the answer is both A) Cl and B) CCl3, since both are produced and used up. The correct solution is only A). Could anyone explain why? Thanks.

I think I should use ln(K2/K1)=Ea/R(1/T1 - 1/T2), and find K2/K1. I am given T1 and T2, but not Ea. I'm not sure how to continue. Thanks. (note: the answer is C)

I accelerate charged particle ##A## causing virtual photons to travel to distant charged particle ##B## which feels an electromagnetic force proportional to ##A##'s acceleration (for a classical field description of this effect see https://www.feynmanlectures.caltech.edu/I_28.html Eqn 28.6)...

I'm so sorry if this is a bad question! I am doing an experiment measuring the rate of gas production (hydrogen) of the electrolysis of water, and I got myself a bit confused about whether I have been taking the correct measurements? I had originally thought that, since the "concentration" of...

I know how to get fusion cross section plots from the exfor website but now I need to plot the reaction rate as a function of temperature. According to the image, I have sigma and E values as x and y data. How do I integrate using MATLAB .

I am stuck, i have compute the total moles as : ## n_{tot}=\frac{P_{tot*V}}{RT}##=0,125 mol ##Kp= \frac{P_{tot}\frac {n_{PCL_3}}{n_{tot}}*P_{tot}\frac {n_{CL_2}}{n_{tot}}}{P_{tot} \frac {n_{PCL_3}}{n_{tot}}}=\frac {P_{tot}}{n_{tot}}*\frac {n_{PCL_3}n_{CL_2}}{n_{PCL_5}}## From here, can't go...

Hi, I understood that to calculate the available energy in these two reactions could be calculated from Ed = [Mn(X) – (Mn(Y) + m(e))] c^2, but when I have to change use the atoms' mass instead of the nucleons' mass, it gives out two different formulas : Ed = [M(X) – M (Y)] c2 for β- Ed = [M(X)...

Here is my solution I just need it to be confirmed Many thanks in advance!

Given: r1 = 0.75 r2 = 1.5 Ok, i have done statics and dynamics, but this book does things differently than the way i accomplished it in the previous classes. This is for mechanical engineering design class. Here is my question. They take sum of the moments along X, which goes through the center...

Summary:: A tertiary allylic alcohol rearranges to become a primary allylic alcohol, would it be exothermic because the final product is more stable and lower in energy? Hi all, this problem's been on my mind for a couple of days now and I'm not making any progress with it. My problem is that...

Trying to determine the reaction torque a person would have to supply to keep the auger head from spinning when the ice auger is drilling a hole So I am an ice fisherman and I got thinking, when you drill a hole with an ice auger, the head always wants to turn opposite of the auger bit. You have...

a.)N cos θ=mg N sin θ=mrw^2 sin θ cos θ=g/rw^2 b.) My question is reaction force =N ? or =F=mg tanθ ? If it is N then N=mg cosθ =mg^2/r w^2 or N=mg/cosθ =mrw^2 ? Thank you

Summary:: Theoretical reaction force due to ball traveling in a semi-circle circum Hi, Can anyone please help me with the following question: Setup... 1 x length of pipe bent 180 degrees with an inner diameter of 22mm, it's radius is 2mtrs, the mass of this object is 100kg. Total length of...

For the reaction between hydrogen peroxide and sodium hypochlorite, is the OCl- both reduced and oxidized? H2O2 + NaOCl -> NaCl + H2O + O2 Oxidation states: +1 -1 +1 -2 +1 +1 -1 +1 -2 0 From the oxidation...

1) ##P(X>0.5)=P(Z>0)=0.5## 2) ##P(0.45<X<0.55)=P(X<0.55)-P(X<0.45)=P(Z<1)-P(Z<-1)\approx68\%## 3) ##P(X>x)=0.9\Leftrightarrow P(Z>\frac{x-0.5}{0.05})=0.9\Leftrightarrow1-P(Z\leq\frac{x-0.5}{0.05})=0.9\Leftrightarrow P(Z\leq\frac{x-0.5}{0.05})=0.1## I find that ##\frac{x-0.5}{0.05}=-1.28##, which...

The principal equilibrium in a solution of NaHCO3 is HCO3-(aq) + HCO3-(aq) <-> H2CO3(aq) + CO32-(aq) Calculate the value of the equilibrium constant for this reaction. My solution: This overall reaction is the same as the sum of the following reactions: HCO3-(aq) <-> H2CO3(aq) + OH-(aq)...

Hi I need to find the amount of fuel needed for a nuclear reaction to produce 800MW daily . The reaction is n + 𝟗𝟒𝑷𝒖 𝟐𝟑𝟗 → 𝟓𝟐𝑻𝒆 𝟏𝟑𝟒 + 𝟒𝟐𝑴𝒐 𝟏𝟎𝟑 + 𝟑 𝒏 Can you please give me a hint on how to do this? Thank you very much for your help

Hello everyone, For this equation, I have found Ay as 0.677kN by using Ma = 1.5kN(7m)-Ay(15.5m). To find Cy, would I be using the sum of forces to find the answer? For example Fy = Ay - F2 - F1sin55 + Cy = 0 This would then get Cy answer as 2.05kN

Hi I'm having trouble to understand the centripetal force in a rotating rod with a mass in its end. When ##90°<\theta<270°##, the centripetal acceleration is produced by the tension, which counteracts the radial component of the weight. But what happens when ##\theta<90°## or ##\theta>270°##...

The following is a basic surface-catalyzed isomerization reaction: A -> P This can be modeled by the following mechanism: A + S -> A-S A-S -> P + S The text is trying to derive the rate law for the formation of P. d[P]/dt = k[A-S] It can also be written as d[P]/dt = k'[thetaA], where thetaA is...

I know that ##\vec{v_c}=(\omega_1;-\omega_2;0)×(L;-r;0)=0## So ##\omega_2=\frac{r\omega_1}{L}## Then, using the system of coordinates shown in the picture and ##\Sigma M_z## I can find the reaction force in ##C##. But how can I find the reaction forces on ##A## and ##O##? I mean, what system...

With the peroxide solution in excess, we added 10ml vinegar and 10ml of different concentrations of permanganate and timed the reaction. The basics are that the more concentrated the permanganate , the faster the reaction. I would just like to know what the theoretical relationship is between...

The equation can be seen in the picture. I was assuming it was an Sn2 reaction given the polar aprotic solvent and strong nucleophile. For b), I assumed that the question asked me to draw the orbitals as shown above (as opposed to orbital diagram) because it asked me to identify the HOMO and...

According to a trusted source (a textbook, if you must know), the actual Gibbs free energy of an otherwise reversible reaction, becomes lower than expected if the local circumstances makes the reaction effectively irreversible. The circumstances are that neither enough energy, nor a reaction...