Chemical Process Calculation Questions and Answers – Limiting and Excess Reactant-I

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This set of Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Limiting and Excess Reactant-I”.

1-7. For the given reaction
C5H12 + 8 O2 → 5 CO2 + 6 H2O
If the reactants C5H12 & O2 are having 2 moles an 8 moles of initial feed respectively.
1. Which is the excess reactant in the reaction?
a) C5H12
b) O2
c) CO2
d) H2O
View Answer

Answer: a
Explanation: C5H12 is the excess reactant as 1 mole of C5H12 = 8 moles of CO2.
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2. Which is the limiting reactant in the reaction?
a) C5H12
b) O2
c) CO2
d) H2O
View Answer

Answer: b
Explanation: O2 is the limiting reactant as 1 mole of C5H12 = 8 moles of CO2.

3. How many moles of C5H12 are there when the reaction completes?
a) 0
b) 1
c) 2
d) 3
View Answer

Answer: b
Explanation: Moles left = Initial mole – extent of the reaction*stoichiometric coefficient.

4. How many moles of O2 are there when the reaction completes?
a) 0
b) 2
c) 4
d) 6
View Answer

Answer: a
Explanation: Moles left = Initial mole – extent of the reaction*stoichiometric coefficient.
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5. How many moles of CO2 produced in the reaction?
a) 5
b) 6
c) 7
d) 8
View Answer

Answer: a
Explanation: Moles produced = extent of the reaction*Stoichiometric coefficient.

6. How many moles of H2O produced in the reaction?
a) 5
b) 6
c) 7
d) 8
View Answer

Answer: b
Explanation: Moles produced = extent of the reaction*Stoichiometric coefficient.

7. What is the extent of the reaction?
a) 0
b) 1
c) 2
d) 3
View Answer

Answer: b
Explanation: Extent of the reaction = (Initial moles – Final moles) / Stoichiometric coefficient.
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8-10. For the given reaction
CO2 + 4 H → CH2O + H2O
In the feed there are 4 moles of CO2, 10 moles of H. If the reaction happens then
8. What is the number of moles of the extent reactant in the reaction after completion?
a) 0
b) 1
c) 1.5
d) 2.5
View Answer

Answer: c
Explanation: Number of moles of CO2 left = 4 – 2.5 = 1.5.

9. What is the extent of the reaction?
a) 0
b) 1
c) 1.5
d) 2.5
View Answer

Answer: d
Explanation: Extent of the reaction = (Initial moles – Final moles) / Stoichiometric coefficient.

10. What is the gms of CO2 produced in the reaction?
a) 0
b) 1
c) 1.5
d) 2.5
View Answer

Answer: d
Explanation: Moles of CO2 produced = 2.5 = Extent of the reaction.
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Sanfoundry Global Education & Learning Series – Chemical Process Calculation.
To practice all areas of Chemical Process Calculation, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn