Thermodynamics and Gibbs Free Energy

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27 Οκτ 2013 (πριν από 3 χρόνια και 7 μήνες)

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Thermodynamics and Gibbs Free Energy

______/ 15 pts


Name_________________________________


YOU MUST SHOW YOUR CALCULATIONS OR WRITE A SENTENCE EXPLAINING YOUR CHOICE


8.18
One version of the First law of Thermodynamics is expressed as
:


E =
q

+

w


Which gives the sign convention for the relationship that is usually used in chemistry?



Heat, q added to the
system

Heat, q added to the
surroundings

Work, w done on
the system

Work, w done on
the surroundings

(A)




H





(B)

H

H

H

H

(C)

H

H

H




(D)

H




H




(E)

H











㠮ㄳ†8hich reacti潮 illustrates the least increase in entr潰o?


(A) ⁎
2
O
4 (g)

→ 2NO
2

(g)

(B) C
6
H
6 (l)

→ C
6
H
6 (g)

(C) 2KClO
3 (s)

→ 3O
2 (g)

+ 2KCl
(s)

(D) H
2 (g)

+ Cl
2 (g)

→ 2HCl
(g)

(E) C
2
H
5
OH
(l)

+ 3O
2
(g)

→ 2CO
2 (g)

+ 3H
2
O
(g)




Thermodynamics and Gibbs Free Energy

______/ 15 pts


Name_________________________________


YOU MUST SHOW YOUR CALCULATIONS OR WRITE A SENTENCE EXPLAINING YOUR CHOICE


8.18
One version of the First law of Thermodyna
mics is expressed as
:


E =
q

+
w


Which gives the sign convention for the relationship that is usually used in chemistry?



Heat, q added to the
system

Heat, q added to the
surroundings

Work, w done on
the system

Work, w done on
the surroundings

(A)





H





(B)

H

H

H

H

(C)

H

H

H




(D)

H




H




(E)

H











㠮ㄳ†8hich reacti潮 illustrates the least increase in entr潰o?


(A) ⁎
2
O
4 (g)

→ 2NO
2

(g)

(B) C
6
H
6 (l)

→ C
6
H
6 (g)

(C) 2KClO
3 (s)

→ 3O
2 (g)

+ 2KCl
(s)

(D) H
2 (g)

+ Cl
2 (g)

→ 2HCl
(g)

(E) C
2
H
5
OH
(l)

+ 3O
2 (g)

→ 2CO
2 (g)

+ 3H
2
O
(g)

8.9 The molar heat of fusion,

H
fus
, for water is 6.01 KJ mol
-
1
. Which expression g
ives the molar entropy of
fusion,

S
fus
, in KJ
-
1

mol
-
1

for ice at its normal melting point?



(A)
6.01


(B)
6.01

(C) 6.01 × 4.18

(D) 6.01 × 273

(E) 6.01 × 298


273 298










8.15 Which describes the thermodynamic p
arameters for the system below at 298 K and 1 atm?


H
2
O
(g)


H
2
O
(l)





G


H


S

(A)


0

> 0

> 0

(B)


0

> 0

<
0

(C)


<
0

> 0

<
0

(D)


<
0

<
0

<
0

(E)


<
0

<
0

> 0






8.9 The molar heat of fusion,

H
fus
, for water is 6.01 KJ mol
-
1
. Which expression gives the molar entropy of
fusion,

S
fus
, in KJ
-
1

mol
-
1

for ice

at its normal melting point?



(A)
6.01


(B)
6.01

(C) 6.01 × 4.18

(D) 6.01 × 273

(E) 6.01 × 298


273 298










8.15 Which describes the thermodynamic parameters for the system below at 298 K and 1 atm?


H
2
O
(g)



H
2
O
(l)





G


H


S

(A)


0

> 0

> 0

(B)


0

> 0

< 0

(C)


< 0

> 0

< 0

(D)


< 0

< 0

< 0

(E)


< 0

< 0

> 0