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What is the heat of reaction for 2H2 + O2 -> 2H2O, if heat of formation of H2, O2, and H2O are 2 J, 5 J, and 10 J respectively?
A
2 J
B
5 J
C
8 J
Correct Answer:
Heat of reaction = 2*10 – 2*2 – 5 = 11 J.
In the reaction 2H2 + O2 -> 2H2O, if the heat liberated is 50 J, what is the heat of formation of H2O?
A
-25 J
B
25 J
C
-50 J
What is the heat of reaction for CH4 + 2O2 -> CO2 + 2H2O, if heat of formation of CH4, O2, CO2 and H2O are 10 J, 5 J, 6 J, and 12 J respectively?
A
-10 J
B
10 J
C
-20 J
What is the heat of reaction for C2H4 + 3O2 -> 2CO2 + 2H2O, if heat of formation of C2H4, O2, CO2, and H2O are 10 J, 5 J, 6 J and 2 J respectively?
A
-4 J
B
-2 J
C
0
The following reaction is representative of which process? 2H2 +O2 —–> 2H2O.
A
Hydrolysis process
B
Electrolytic process
C
Nucleophilic process
D
None of the mentioned
2H2 + O2 → 2H2O is an elementary chemical reaction.
A
True
B
False
What is the enthalpy of reaction for CH4 + 2O2 -> CO2 + 2H2O, if the conversion of CH4 is 50%, and heat of formation of CH4, O2, CO2, and H2O are 10 J, 0, 6 J and 4 J?
A
0
B
2 J
C
4 J
What is the enthalpy of reaction for C2H4 + 3O2 -> 2CO2+ 2H2O, if the conversion of CH4 is 50%, and heat of formation of CH4, O2, CO2, and H2O are 10 J, 0, 6 J and 4 J?
A
0
B
2 J
C
5 J
What is the enthalpy of reaction for CO2 + 4H2 -> 2H2O + CH4, if the conversion of CO2 is 50%, and heat of formation of CO2, H2, H2O, and CH4 are 6 J, 0, 4 J and 10 J?
A
2 J
B
5 J
C
6 J
A reactor is supplied with 5 moles each of CH3OH and O2, and the following reactions occur, CH3OH + 1/2O2 -> CH2O + H2O and then CH2O + 1/2O2 -> CO + H2O, the conversion of methanol is 80% in first reaction, and conversion of CH2O is 50% in second reaction. How many moles of H2O are produced?
A
2
B
3
C
5
At a given temperature, K₁, K₂ and K3 are equilibrium constants for the following reactions 1, 2, 3 respectively.
CH₄(g) + H₂O(g) ⇋ CO(g) + 3H₂(g),
CO(g) + H₂O(g) ⇋ CO₂(g) + H₂(g)
CH₄(g) + 2H₂O(g) ⇋ CO₂(g) + 4H₂(g)
Then K₁, K₂ and K3 are related as:
A
K3 = K₁.K₂
B
K3 = (K₁.K₂)<sup>0.5</sup>
C
K3(K₁+K₂)/2
D
K3 = (K₁.K₂)2