Chemical Engineering

Stoichiometry Applications Terminology

Question 1
Marks : +2 | -2
Pass Ratio : 100%
H2O2 + H2 -> 2H2O, if the extent of reaction is 10, how much water is produced?
10 moles
20 moles
30 moles
40 moles
Explanation:
10 = (x – 0)/2, => x = 20 moles.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
What is extent of reaction of a in the reaction 2CO + O2 -> 2CO2, if 20 moles CO2 is produced?
5
10
20
40
Explanation:
Extent of reaction = (20 – 0)/2 = 10.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
4FeS2 + 11O2 -> 2Fe2O3 + 8SO2, what is the extent of reaction if 512 grams of SO2 is produced?
1
2
3
4
Explanation:
Moles of SO2 = 512/64 = 8, => Extent of reaction = (8 – 0)/8 = 1.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
N2 + 2O2 -> 2NO2, what is the extent of reaction if 6 moles of NO2 is produced?
3
6
12
18
Explanation:
Extent of reaction = (6 – 0)/2 = 3.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
2 moles of N2 and 8 moles of H2 are reacted, then what type of reactant N2 is?
Limiting reagent
Excess reagent
Can’t say
None of the mentioned
Explanation:
The balanced chemical reaction is N2 + 3H2 -> 2NH3, => If 2 moles of N2 are reacting only 6 moles of H2 will react, this means H2 is an excess reagent and N2 is a limiting reagent.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is true about limiting reagents?
Consumes completely
Consumes partially
Does not react
None of the mentioned
Explanation:
Limiting reagent is the reactant which reacts completely in a reaction.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
CH4 + 2O2 -> CO2 + 2H2O, what is the extent of reaction if only 50% of 96 grams of CH4 is consumed?
1
2
3
4
Explanation:
Moles of CH4 = 96/16 = 6, => Extent of reaction = (6*0.5 – 6)/(-1) = 3.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
4 moles of CO and 2 moles of O2 are reacted, then what type of reactant O2 is?
Limiting reagent
Excess reagent
Can’t say
None of the mentioned
Explanation:
The balanced chemical reaction is 2CO + O2 -> 2CO2, => If 4 moles of CO are reacting, 2 moles of O2 will react, this means none of the two is limiting reagent or excess reagent.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
4 moles of CH4 and 4 moles of O2 are reacted, then what type of reactant CH4 is?
Limiting reagent
Excess reagent
Can’t say
None of the mentioned
Explanation:
The balanced chemical reaction is CH4 + 2O2 -> CO2 + 2H2O, => If 4 moles of O2 are reacting only 2 moles of CH4 will react, this means CH4 is an excess reagent.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is true about excess reagents?
Consumes completely
Consumes partially
Does not react
None of the mentioned
Explanation:
Excess reagents are reactants which are excess in amount and reacts partially in a reaction.