A reaction
A (aq) + B (aq) <--> C (aq)
has a standard free-energy change of –3.85 kJ/mol at 25 °C. What are the concentrations of A, B, and C at equilibrium if, at the beginning of the reaction, their concentrations are 0.30 M, 0.40 M, and 0 M, respectively?
[A]= M
[B]= M
[C]= M
In: Chemistry
The intermediate product of a chemical process is a chemical paste that is saturated with water. The paste is rolled into a thin layer and placed to dry in a flat area 30m long 15m wide. Drying is enhanced by blowing hot air over the paste, and the mass transfer coefficient is 0.017 m/s. Diffusion of water through the paste is rapid so that the concentration of water vapor at the surface of the paste remains constant at 0.002 gmol/L. Water must be removed from the paste remains at a minimum rate of 9.5 L/min (liquid volume). (Note:MW water=18 and p water=1 g/cm^3.) a.) What mechanism controls the transfer of water from the paste in the air? b.) What is the molar rate of water removal that corresponds to a volumetric removal rate of 9.5 L/min? C.) What is the maximum concentration of water vapor allowable in the air (far from the paste surface) if water must be removed at a rate of at least 9.5 L/min? D.) Assuming that the mass transfer coefficient remains constant, what can be done to increase the rate of water removal from the paste?
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How much 5.50 M NaOH must be added to 500mL of a buffer that is .0180 M Acetic Acid and .0250 M sodium acetate to raise the pH of 5.75?
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(a) The cell of interest in this figure is: Cu(s) | CuSO4(aq, 1.0 M) | KCl(aq, 3 M) | AgCl(s) | Ag(s) Write reduction half-reactions for this cell. (Omit states-of-matter from your answer.)
In: Chemistry
A sample of a copper ore with a mass of 0.4225 g was dissolved in acid. A solution of potassium iodide was added, which caused the reaction:
2Cu2+(aq) + 5I
In: Chemistry
When SbCl3(g) (0.001539 mol/L) and 0.6772 mol of Cl2(g) in a 440.0 L reaction vessel at 665.0 K are allowed to come to equilibrium the mixture contains 0.0009506 mol/L of SbCl5(g). What is the concentration (mol/L) of SbCl3(g)? SbCl3(g)+Cl2(g) = SbCl5(g)
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Why was your measured refractive index different from the value given in the lab report?
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A proton is located at a distance of 0.049 m from a point charge of +8.30 ?C. The repulsive electric force moves the proton until it is at a distance of 0.16 m from the charge. Suppose that the electric potential energy lost by the system were carried off by a photon. What would be its wavelength?
In: Chemistry
1. What is the reason why activites are often called effective concentrations? Explain why there are differences between activities and concentrations.
2. Methane dissociates into H2(g) and C(s, graphite).
- Calculate the equilibrium constant K at 298 K.
- Calculate K at 50°C (assuming that ΔrH^Θ is temperature independent.
- Calculate α (degree of dissociation of methane) at 25°C and a total pressure of 0.010 bar.
3. What is the value of ΔrG for the reaction
NO2(g) ⇔ N2O4(g) when
Q = 0.1
Q = 1.0
Q = 10.0
Q= 100.0
Estimate (by interpolation) the value of K from the values you calculated.
Compare with the value obtained from the thermodynamic definition of the equilibrium constant.
In: Chemistry
Consider separate 1.0 L samples of the following gases at STP: Cl2, C2H6, and Xe. Which of the following statements are true regarding these gas samples?
The C2H6 gas sample has the smallest average kinetic energy.
The mass of the gas in each container is the same.
The C2H6 gas molecules collide with the container walls most frequently.
The C2H6 gas sample has the lowest density.
Each Cl2 gas particle collision with the container wall is more forceful as compared to each C2H6 and Xe collision.
The Cl2 gas sample has the most molecules of gas present.
In: Chemistry
Consider the reaction
C12H22O11(s)+12O2(g)→12CO2(g)+11H2O(l)
in which 10.0 g of sucrose, C12H22O11, was burned in a bomb calorimeter with a heat capacity of 7.50 kJ/∘C. The temperature increase inside the calorimeter was found to be 22.0 ∘C. Calculate the change in internal energy, ΔE, for this reaction per mole of sucrose.
Express the change in internal energy in kilojoules per mole to three significant figures.
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WORKSHEET 1- answers. i need explanation and wrok shown for each questions.
1) A 2) C 3) E 4) E 5) E 6) E 7) D 8) E 9) B 10) E 11) D 12) C 13) D 14) D 15) B 16) D
http://east.cherryhill.k12.nj.us/Summer_Assignments/pdfs/c01ws01.pdf
In: Chemistry
a) Magnesium metal reacts with HCl solution, liberating H2 gas and generating Mg2+ cations in solution. A 2.780-g sample of Mg metal is added to 50.0 mL of a 4.00 M HCl solution, and the reaction goes to completion. What mass of H2 is formed?
b) What is the concentration of Mg2+ ions in the resulting solution? (Assume the final volume of solution is still the same as the original volume of the acid.)
In: Chemistry
When Acetic acid (CH3COOH) reacts with sodium bicarbonate a neutralization reaction occurs: [20 pts]
(a) Write the balanced chemical equation for this reaction.
(b) If you are given 1.26 x 102 g of acetic acid and 1.68 x 102 g of sodium bicarbonate, what reagent would be limiting?
(c) What would be the theoretical yield of the product(s)?
(d) How many grams of excess reagent would be left over?
(e) If the reaction yielded 68.46 g of the gas, 27.52 g of the liquid, and 159.6 g of the salt, what would their percent yields be?
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On the basis of your research, respond to the following:
Why and how does atomic nuclear decay take place? Explain.
What is the significance of atomic nuclear decay?
What is your analysis on the societal implications of using this process?
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