Chemical Engineering

Accounting for Chemical Reactions in Material Balances

Question 1
Marks : +2 | -2
Pass Ratio : 100%
In a system if, Accumulation = Input – Output + Generation – Consumption, where all the four terms are distinct and non-zero, then the system is which of the following?
Steady-state
Closed
Non-reactive
None of the mentioned
Explanation:
As the formula involves input and output it is an open system, and also as it involves generation and consumption the system is reactive, and since the input is not equal to output so the system is unsteady-state, and the answer is d.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
In a system if, Accumulation = Input – Output, where both the terms are distinct and non-zero, then the system is which of the following?
Steady-state
Closed
Non-reactive
None of the mentioned
Explanation:
As the formula does not involve generation and consumption it is a non-reactive system.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
In a steady-state reactive system, NaOH and HCl are supplied to the system both at the rate of 100 mole/min, then what is the rate of NaCl produced?
100 mole/min
200 mole/min
300 mole/min
400 mole/min
Explanation:
As the system is in steady-state, rate of product = rate of feed, => rate of NaCl = 100 + 100 = 200 mole/min.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
In a steady-state reactive system, 2 molar NaCl and 1 molar H2CO3 are supplied to the system both at the rate of 100 mole/min, then how much Na2CO3 produced?
1 molar
2 molar
3 molar
4 molar
Explanation:
The balanced reaction of the system is 2NaCl + H2CO3 -> Na2CO3 + 2HCl, => amount of Na2CO3 = 1 molar.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
In a steady-state reactive system, 5 molar KNO3 and 5 molar H2SO4 are supplied to the system, then what is the amount of K2SO4 produced?
2.5 molar
5 molar
7.5 molar
10 molar
Explanation:
The balanced chemical reaction of the system is 2KNO3 + H2SO4 -> K2SO4 + 2HNO3, => amount of K2SO4 = 2.5 molar.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
In a steady-state reactive system, 5 molar CH4 and 5 molar O2 are supplied to the system, then what is the amount of CO2 produced?
2.5 molar
5 molar
7.5 molar
10 molar
Explanation:
The balanced chemical reaction of the system is CH4 + O2 -> CO2 + 2H2O, => amount of CO2 = 5 molar.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
In a steady-state reactive system, 1 molar each of NaOH and HCl are supplied to the system both at the rate of 100 L/min, then what is the amount of NaCl produced?
1 molar
2 molar
3 molar
4 molar
Explanation:
The balanced reaction of the system is NaOH + HCl -> NaCl + H2O, => amount of NaCl = amount of HCl = amount of NaOH = 1 molar.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
In a system if, Accumulation = Generation – Consumption, where both the terms are distinct and non-zero, then the system is which of the following?
Steady-state
Closed
Non-reactive
None of the mentioned
Explanation:
As the formula does not involve input and output it is a closed system.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
In a steady-state reactive system, NaCl and H2CO3 are supplied to the system at the rate of 200 L/min and 100 L/min respectively, what is the rate at which Na2CO3 is produced?
100 L/min
200 L/min
300 L/min
400 L/min
Explanation:
As the system is in steady state, => rate of product = rate of feed, => rate of Na2CO3 = 200 + 100 = 300 L/min.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
The general material balance equation for reactive system is Accumulation = Input + Generation – x, what is x?
Consumption – Output
Consumption + Output
Output – Consumption
None of the mentioned
Explanation:
Accumulation = Input – Output + Generation – Consumption, => x = Consumption + Output.