Material Balance Concept

Question 1
Marks : +2 | -2
Pass Ratio : 100%
10 moles of O2 is added to 10 moles of H2, how many moles of H2O will it produce?
5
10
15
20
Explanation:
Balanced equation is 2H2 + O2 -> 2H2O, => Moles of H2O = Moles of H2 = 10.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
A reaction has reactants 2 moles of NaOH and 1 mole of H2SO4, and products Na2SO4 and H2O, what are the total moles of products?
1
2
3
4
Explanation:
Material Balance for Na: 2*1 = n1*2 => n1 = 1, for H: 2*1 + 1*2 = n2*2 => n2 = 2, => total moles of products = 1 + 2 = 3.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
Which of the following does the concept of material balance based upon?
Conservation of mass
Conservation of energy
Conservation of momentum
Conservation of Volume
Explanation:
Material is simply conservation of mass.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
10 moles of A were present in a system initially, and 10 moles of C are added to it, it follows the reaction 2A + C -> 5B, what is the number of moles of B produced?
5
10
25
50
Explanation:
Mole of B = 5*5 = 25.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
A container has 10 grams of water 5 grams of water is added and 2 grams of water is taken out, what is the final amount of water?
7 grams
10 grams
13 grams
15 grams
Explanation:
Final condition = Initial condition + sum of inputs – sum of outputs = 10 + 5 – 2 = 13 grams.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
The equation of material balance, (Final condition + Sum of outputs) is equal to which of the following?
Initial condition – Sum of inputs
Initial condition + Sum of inputs
Sum of inputs – Initial condition
None of the mentioned
Explanation:
Equation of material balance is Final condition – Initial condition = Sum of inputs – Sum of outputs, => Final condition + Sum of outputs = Initial condition + Sum of inputs.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
A reaction is A + 2B -> 3C, if 2 moles of A and 4 moles of B entered the system, what are the number of moles of C formed?
2
4
6
8
Explanation:
Moles of C = 3*2 = 6.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
In a random reaction 2 mole of CH4 and 1 mole of C2H4 are reacted, and 1 mole of C3H8 and 1 mole of CxHy are produced, what is x*y?
2
4
8
12
Explanation:
Material balance for C: 2*1 + 1*2 =1*3 +1*x, => x = 1, for H: 2*4 + 1*4 = 1*8 + 1*y, => y = 4, => x*y = 4.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
A combustion reaction has reactants 1 mole of CxHy and 2 moles of O2 and products 1 mole of CO2 and 2 mole of H2O, what is x + y?
1
3
4
5
Explanation:
Moles of C, H and O in reactants = Moles of C, H and O in products, => C: 1*x = 1*1 => x = 1, H: 1*y = 2*2 => x + y = 5.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
10 moles of A were present in a system initially, and 10 moles are added to it, it follows the reaction 4A -> B, what are the number of moles of B produced?
5
10
15
20
Explanation:
Moles of B = (10 + 10)/4 = 5.