Chemistry 152 major help!! (equilibrium's and kc mostly)?
1.) At a certain temperature, the equilibrium constant kc for this reaction is 53.3 H2 (g) + I2 (g) <--> 2HI (g) kc = 53.3 At this temperature, 0.600 mol of H2 and 0.600 mol of I2 were placed in a 1.00-L container to react. What concentration of HI is present at equilibrium? 1st .. write a balanced equation ... done 2nd ... find molar concentrations of all substances at the beginning of the reaction ... moles / liter 3rd ... use variable (usually x) to represent changes in molarity caused by the reaction 4th ... use 2 & 3 to set up the concentrations at equilibrium. 5th ... write an algebraic equation for Kc ... Kc = conc products / conc reactants raised to appropriate exponents (the exponents are the coefficients of the balanced equation) 6th ... analyze ... maybe "round" the algebraic expressions if the variable can be very small compared to those quantities they are added to or subtracted from then make the math easier. 7th ... solve the math equation. 8th .. use the variable to find concentrations at equilibrium. That's it. I'll do #1 .. you try the rest. step 2 .. [H2] = 0.600 mole / 1L = 0.600 M ... [I2] = 0.600 mole / 1L = 0.600 M step 3 .. x = amount of HI formed ... x = amount of H2 used and x = amount I2 used step 4 .. [H2] = (0.600 - x) .... [ I2] = (0.600 - x) ... [HI] = 2x step 5 .. Kc = [HI]^2 / ( [H2] [ I2] ) .... 53.3 = (2x)^2 / ( (0.600 - x)(0.600 - x) ) step 6 .. round ... 53.3 = (2x)^2 / ( (0.600)(0.600) ) step 7 .. 4x^2 = 19.188 .... x^2 = 4.797 .... x = 2.19 ... NOT small ... must go back and resolve using the quadratic formula.
How is equilibrium important?
Equilibrium is an important concept because it brings stability .For example, when a chemical reaction reaches equilibrium , the chemicals become stable, so we can predict and rely on how the products will react.
A+2B<——>C For the above reaction, the equilibrium constant is 4. at equilibrium the concentration of a and c are found to be 4.?
For the above reaction, the equilibrium constant is 4. at equilibrium the concentration of a and c are found to be 4M each. What then is then concentration of B? can you explain the reasoning that the answer is 0.5M
What is the importance of equilibrium?
Equilibrium means that things are steady state. Which means that things aren’t changing. Which means that calculations are greatly simplified, since all all terms in equations relating to rates of change can be eliminated (they are equal to zero; the definition of steady state/equilibrium).
How difficult is chemical engineering?
You need to be good at math. You'll take several semesters of calculus, and one or two semesters of differential equations. Everyone talks about the chemistry. You'll take basic, organic, and physical chemistry, as well has a minimum of 8 hours of physics. - the latter two are more math based. Kinetics (rates of reactions) involves some chemistry and more math, but once you've finished those, you won't do much actual chemistry. Two semesters of thermodynamics - a lot of theoretical work (Maxwell equations, equations of states, by way of examples). Materials science is pretty easy. Heat-and-material balance, mass transfer, and fluid dynamics courses- those form the core of your chemical engineering. Additionally, you will take basic engineering sciences in other disciplines, mostly like a statics course (sort of souped-up Newtonian physics), probably one or two electrical engineering courses, an engineering economics course. I also took classes in polymer science and process control. You will have a class on unit ops, which is an overview of several different actual processes that you would see in a plant - in the lab portion we had a mini distillation column, a cooling tower, two evaporators, a Reynolds number fluid flow apparatus. One of the evaporators had a tube leak, and part of the grade on your report was that you actually figured out there was a tube leak because you couldn't get your heat and materials calculations to balance. I was in the top 3% of my high school class, I took every math, physics, and chemistry class offered, I made straight As in all my college science classes (chem, biology, physics), and I still had to work my butt off. I know only 2-3 people that had 4.0 in chemical engineering.