1. rHo for the following reaction is 10 kJ/mol, and rSo is zero. At what tempera

Question

1.   rHo for the following reaction is 10 kJ/mol, and rSo is zero. At what temperature will the mole fraction of cis-butene equal 0.20 ? Assume no other molecules are present and that the total pressure is 1 bar.

trans-2-butene(g) <==> cis-2-butene(g)  

b.    The total pressure is increased isothermally to 10 bar. What is the mole fraction of cis-butene at this pressure?

2.   What is (A/V)(G/P)?    Assume isothermal, reversible.

3.   Using the data below, what is rGo for the following reaction if the temperature is 298 K?

C6H6 (benzene, gas) <==> 3C2H2 (g)

Data is deltaH and deltaS (not deltaG) from thermo tables

What is rG if T = 10 K (assume rH and rS are temperature independent) and the pressures of both gases are 10-15 atm? (Remember that the standard state used in the appendices is 1 atm of pressure for gases) These conditions are roughly typical of interstellar clouds.

You may also see Clausius-Clapeyron type problems and Raoult’s and Henry’s Law

Questions.

Chem 440 more practice Test 2 Fall 2015        Name                                                           

1.   rHo for the following reaction is 8.314 kJ/mol, and rSo is zero. At what temperature will the mole fraction of A be 0.75 ? Assume no other molecules are present and that the total pressure is 3.14 bar.

A(g) <==> B(g)  

b.    Now assume rSo for the reaction is 8.314 J mol-1 K-1 . What temperature would give a mole fraction for A of 0.75?

2.   What is (V/T)p / (S/P)T?    Assume reversible.

3. An engine runs a reversible Carnot cycle with a high temperature of 700 degrees and a low temperature of 300 degrees. If the engine must produce 100 watts of power, what is the necessary heat flow in, and what is the waste heat flow out?

4.   Using the data below, what is rGo for the following reaction if the temperature is 298 K?

H2 + D2 <==> 2HD

Assuming that rH and rS are independent of temperature, at what temperature will the equilibrium constant be 1.0?

5.   Estimate Ho and Uo for the following reaction using the table of typical bond energies. Note that the table is in kcal/mol, and 1 kcal = 4.184 kJ.

Cyclo-C6H6 (g) + F2 (g) 1,6-difluorohexane (l)

Explanation / Answer

There are multiple questions here . i am allowed to answer only 1 at a time. I will answer 1st question for you.Please ask other as different question
1.
a)
delta G =delta H - T* delta S
delta G = 10000 - 0
                 = 10000 J

use:
delta G = -R*T*ln kc
10000 = -8.314*T*ln Kc
Kc = e^(-1202.8/T)
Let total number of moles be 1 and volume be 1 L
[Cis 2 butene] = 0.2
[Trans 2 butene] = 0.8
Kc = [Cis 2 butene] / [Trans 2 butene]
e^(-1202.8/T) = 0.2/0.8
1202.8/T = - 1.3863
T = 867.64 K

Answer: 867.64 K

b)
Since reactant and product both are in 1:1 ratio. I dont think changing pressure will have any effect on equilibrium.
Mole fraction of Cis-butene will still be 0.2

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