Given the following data Ca ( s ) + 2 C ( g r a p h i t e ) → CaC 2 ( s ) Δ H = − 62.8 KJ Ca ( s ) + 1 2 O 2 ( g ) → CaO ( s ) Δ H = − 635.5 KJ CaO ( s ) + H 2 O ( l ) → Ca ( OH ) 2 ( a q ) Δ H = − 653.1 KJ C 2 H 2 ( g ) + 5 2 O 2 ( g ) → 2 CO 2 ( g ) + H 2 O ( l ) Δ H = − 1300. KJ C ( g r a p h i t e ) + O 2 ( g ) → CO 2 ( g ) Δ H = − 393.5 KJ Calculate ∆ H for the reaction CaC 2 ( s ) + 2 H 2 O ( l ) → Ca ( OH ) 2 ( a q ) + C 2 H 2 ( g )
Given the following data Ca ( s ) + 2 C ( g r a p h i t e ) → CaC 2 ( s ) Δ H = − 62.8 KJ Ca ( s ) + 1 2 O 2 ( g ) → CaO ( s ) Δ H = − 635.5 KJ CaO ( s ) + H 2 O ( l ) → Ca ( OH ) 2 ( a q ) Δ H = − 653.1 KJ C 2 H 2 ( g ) + 5 2 O 2 ( g ) → 2 CO 2 ( g ) + H 2 O ( l ) Δ H = − 1300. KJ C ( g r a p h i t e ) + O 2 ( g ) → CO 2 ( g ) Δ H = − 393.5 KJ Calculate ∆ H for the reaction CaC 2 ( s ) + 2 H 2 O ( l ) → Ca ( OH ) 2 ( a q ) + C 2 H 2 ( g )
Solution Summary: The author defines enthalpy change as amount of heat absorbed or released in chemical reactions at constant pressure.
Ca
(
s
)
+
2
C
(
g
r
a
p
h
i
t
e
)
→
CaC
2
(
s
)
Δ
H
=
−
62.8
KJ
Ca
(
s
)
+
1
2
O
2
(
g
)
→
CaO
(
s
)
Δ
H
=
−
635.5
KJ
CaO
(
s
)
+
H
2
O
(
l
)
→
Ca
(
OH
)
2
(
a
q
)
Δ
H
=
−
653.1
KJ
C
2
H
2
(
g
)
+
5
2
O
2
(
g
)
→
2
CO
2
(
g
)
+
H
2
O
(
l
)
Δ
H
=
−
1300.
KJ
C
(
g
r
a
p
h
i
t
e
)
+
O
2
(
g
)
→
CO
2
(
g
)
Δ
H
=
−
393.5
KJ
Calculate ∆H for the reaction
CaC
2
(
s
)
+
2
H
2
O
(
l
)
→
Ca
(
OH
)
2
(
a
q
)
+
C
2
H
2
(
g
)
Explain why acid chlorides are more reactive than amides in reactions with nucleophiles.
Calculating the pH of a weak base titrated with a strong acid
An analytical chemist is titrating 101.7 mL of a 0.3500M solution of piperidine (C5H10NH) with a 0.05700M solution of HClO4. The pK of piperidine is 2.89.
Calculate the pH of the base solution after the chemist has added 682.9 mL of the HClO solution to it.
4
Note for advanced students: you may assume the final volume equals the initial volume of the solution plus the volume of HClO solution added.
4
Round your answer to 2 decimal places.
pH = .11
00.
18
Ar
The following is a two groups (Regular tomato sauce & Salt Reduced Tomato Sauce) of data recorded by a team analysising salt content in tomato sauce using the MOHR titration method:
Regular Tomato Sauce
Salt Reduced Tomato Sauce
340.0
262.7
QUESTION: For both groups of data provide answers to the calculations attached in the image
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