Substitute natural gas (SNG) is a gaseous mature containing C H 4 ( g ) that can be used as a fuel. One reaction for the production of SNG is 4 C O ( g ) + 8 H 2 O → 3 C H 4 ( g ) + 2 H 2 ( I ) Δ rH ° = ? Use appropriate data from the following list to determine Δ r H ° for this SNG reaction. C ( g r a p h i t e ) + 1 2 O 2 ( g ) → C O ( g ) Δ r H ° = − 110.5 k J m o l − 1 C O ( g ) + 1 2 O 2 ( g ) → C O 2 ( g ) Δ r H ° = − 283.0 k J m o l − 1 H 2 ( g ) + 1 2 O 2 ( g ) → H O 2 ( g ) Δ r H ° = − 285.8 k J m o l − 1 C ( g r a p h i t e ) + 2 H 2 ( g ) → C H 4 ( g ) Δ r H ° = − 74.8 k J m o l − 1 C H 4 ( g ) + 2 O 2 ( g ) → C O 2 ( g ) + 2 H 2 O ( I ) Δ r H ° = − 890.3 k J m o l − 1
Substitute natural gas (SNG) is a gaseous mature containing C H 4 ( g ) that can be used as a fuel. One reaction for the production of SNG is 4 C O ( g ) + 8 H 2 O → 3 C H 4 ( g ) + 2 H 2 ( I ) Δ rH ° = ? Use appropriate data from the following list to determine Δ r H ° for this SNG reaction. C ( g r a p h i t e ) + 1 2 O 2 ( g ) → C O ( g ) Δ r H ° = − 110.5 k J m o l − 1 C O ( g ) + 1 2 O 2 ( g ) → C O 2 ( g ) Δ r H ° = − 283.0 k J m o l − 1 H 2 ( g ) + 1 2 O 2 ( g ) → H O 2 ( g ) Δ r H ° = − 285.8 k J m o l − 1 C ( g r a p h i t e ) + 2 H 2 ( g ) → C H 4 ( g ) Δ r H ° = − 74.8 k J m o l − 1 C H 4 ( g ) + 2 O 2 ( g ) → C O 2 ( g ) + 2 H 2 O ( I ) Δ r H ° = − 890.3 k J m o l − 1
Substitute natural gas (SNG) is a gaseous mature containing
C
H
4
(
g
)
that can be used as a fuel. One reaction for the production of SNG is
4
C
O
(
g
)
+
8
H
2
O
→
3
C
H
4
(
g
)
+
2
H
2
(
I
)
Δ
rH
°
=
?
Use appropriate data from the following list to determine
Δ
r
H
°
for this SNG reaction.
C
(
g
r
a
p
h
i
t
e
)
+
1
2
O
2
(
g
)
→
C
O
(
g
)
Δ
r
H
°
=
−
110.5
k
J
m
o
l
−
1
C
O
(
g
)
+
1
2
O
2
(
g
)
→
C
O
2
(
g
)
Δ
r
H
°
=
−
283.0
k
J
m
o
l
−
1
H
2
(
g
)
+
1
2
O
2
(
g
)
→
H
O
2
(
g
)
Δ
r
H
°
=
−
285.8
k
J
m
o
l
−
1
C
(
g
r
a
p
h
i
t
e
)
+
2
H
2
(
g
)
→
C
H
4
(
g
)
Δ
r
H
°
=
−
74.8
k
J
m
o
l
−
1
C
H
4
(
g
)
+
2
O
2
(
g
)
→
C
O
2
(
g
)
+
2
H
2
O
(
I
)
Δ
r
H
°
=
−
890.3
k
J
m
o
l
−
1
3. Propose a synthesis for the following transformation. Do not draw an arrow-pushing
mechanism below, but make sure to draw the product of each proposed step (3 points).
CN
+ En
CN
3) Propagation of uncertainty. Every measurement has uncertainty. In this problem, we'll
evaluate the uncertainty in every step of a titration of potassium hydrogen phthalate (a
common acid used in titrations, abbreviated KHP, formula CsH5KO4) with NaOH of an
unknown concentration.
The calculation that ultimately needs to be carried out is:
concentration NaOH
1000 x mass KHP × purity KHP
molar mass KHP x volume NaOH
Measurements:
a) You use a balance to weigh 0.3992 g of KHP. The uncertainty is ±0.15 mg (0.00015
g).
b) You use a buret to slowly add NaOH to the KHP until it reaches the endpoint. It takes
18.73 mL of NaOH. The uncertainty of the burst is 0.03 mL..
c) The manufacturer states the purity of KHP is 100%±0.05%.
d) Even though we don't think much about them, molar masses have uncertainty as well.
The uncertainty comes from the distribution of isotopes, rather than random
measurement error. The uncertainty in the elements composing KHP are:
a. Carbon:
b. Hydrogen:
±0.0008…
Don't used hand raiting and don't used Ai solution
Chapter 7 Solutions
General Chemistry: Principles And Modern Applications Plus Mastering Chemistry With Pearson Etext -- Access Card Package (11th Edition)
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