Used in welding metals, the reaction of acetylene with oxygen has Δ H ° = − 1256 kJ: C 2 H 2 ( g ) + 5 / 2 O 2 ( g ) → H 2 O ( g ) + 2 C O 2 ( g ) Δ H ° = − 1256.2 kJ How much PV work is done in kilojoules and what is the value of Δ E in kilojoules for the reaction of 6.50 g of acetylene at atmospheric pressure if the volume change is -2.80 L?
Used in welding metals, the reaction of acetylene with oxygen has Δ H ° = − 1256 kJ: C 2 H 2 ( g ) + 5 / 2 O 2 ( g ) → H 2 O ( g ) + 2 C O 2 ( g ) Δ H ° = − 1256.2 kJ How much PV work is done in kilojoules and what is the value of Δ E in kilojoules for the reaction of 6.50 g of acetylene at atmospheric pressure if the volume change is -2.80 L?
Solution Summary: The author explains that the PV work done in kJ and change in internal energy for the reaction needs to be determined.
Used in welding metals, the reaction of acetylene with oxygen has
Δ
H
°
=
−
1256
kJ:
C
2
H
2
(
g
)
+
5
/
2
O
2
(
g
)
→
H
2
O
(
g
)
+
2
C
O
2
(
g
)
Δ
H
°
=
−
1256.2
kJ
How much PV work is done in kilojoules and what is the value of
Δ
E
in kilojoules for the reaction of 6.50 g of acetylene at atmospheric pressure if the volume change is -2.80 L?
In the following reaction, what quantity in moles of CH₃OH are required to give off 4111 kJ of heat? 2 CH₃OH (l) + 3 O₂ (g) → 2 CO₂ (g) + 4 H₂O(g) ∆H° = -1280. kJ
Indicate the processes in the dismutation of Cu2O.
1. Consider these three reactions as the elementary steps in the mechanism for a chemical reaction.
2600
2400
2200
2000
1800
1600
1400
1200
1000
800
Potential Energy (kJ)
600
400
200
0
-200-
-400
-600-
-800
(i) Cl₂ (g) + Pt(s) → 2Cl (g) + Pt(s)
(ii) Cl (g)+ CO (g) + Pt (s) → CICO (g) + Pt (s)
Ea = 1550 kJ
Ea = 2240 kJ
(iii) Cl (g) + CICO (g) → Cl₂CO (g)
Ea
= 2350 kJ
AH=-950 kJ
ΔΗ = 575 ΚΙ
AH=-825 kJ
a. Draw the potential energy diagram for the reaction. Label the data points for clarity.
The potential energy of the reactants is 600 kJ
Reaction Progress
b. What is the overall chemical equation?
c. What is the overall change in enthalpy for the above chemical reaction?
d. What is the overall amount of activation energy for the above chemical reaction?
e. Which reaction intermediate would be considered a catalyst (if any) and why?
f. If you were to add 2700kJ of energy to the reaction (e.g. 2700 kl of heat or electricity), would
you be able to make the reaction reverse itself (i.e. have…
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