Chemical Process Calculation Questions and Answers – Terminology for a Reaction System-I

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This set of Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Terminology for a Reaction System-I”.

1. Extent of a reaction denotes
a) Total number of moles reacting in a reaction
b) How much a reaction is occurring?
c) Number of moles of a reactant that react in a reaction
d) None of the mentioned
View Answer

Answer: b
Explanation: It denotes that how much a reaction occurs.
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2. The unit of extent of a reaction is
a) Unit-less
b) Moles reacting
c) Kg reacting
d) None of the mentioned
View Answer

Answer: b
Explanation: The unit of extent of a reaction is Moles reacting.

3-5. If 5 moles of N2 is combined with 12 moles of H2 as per given reaction.
N2 + 3 H2 → 2 NH3
3. What is the extent of reaction?
a) 12 moles reacting
b) 8 moles reacting
c) 4 moles reacting
d) 2 moles reacting
View Answer

Answer: c
Explanation: Extent of the reaction is = (5-1) / (1) = 4.

4. How many moles are left of N2 in the reaction?
a) 1 mole
b) 2 moles
c) 4 moles
d) 3 moles
View Answer

Answer: a
Explanation: Moles of N2 left in the reaction = 5-4 = 1 mole.

5. How many moles of NH3 are there in the reaction?
a) 1 mole
b) 2 moles
c) 4 moles
d) 8 moles
View Answer

Answer: d
Explanation: Moles of NH3 = 2*4 = 8.
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6-9. For the given reaction
C3H8 + 5O2 → 3CO2 + 4H2O
88 kg of C3H8 is reacting with 160 moles of O2.

6. What is extent of the reaction?
a) 1 mole
b) 2 moles
d) 3 moles
c) 4 moles
View Answer

Answer: a
Explanation: 1 mole of C3H8 is reacting and then extent of reaction = (2-1) / (1) = 1.

7. How many kg moles of C3H8 left in the reaction?
a) 1 mole
b) 2 moles
d) 3 moles
c) 4 moles
View Answer

Answer: a
Explanation: 1 mole of C3H8 is reacting. Left moles = 2-1 = 1.

8. How many kg of CO2 is produced?
a) 132
b) 88
d) 44
c) 22
View Answer

Answer: a
Explanation: CO2 produced = 3*44=132.
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9. How many kg of H2O is produced?
a) 72
b) 36
d) 12
c) 6
View Answer

Answer: a
Explanation: H2O produced = 4*18 = 72.

10. How many moles of O2 are there in the reaction?
a) 0
b) 36
d) 72
c) 108
View Answer

Answer: a
Explanation: O2 is a limiting reactant.

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