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Question

Calculate the amount of Carbon monoxide formed when 840 g of hexene reacts with 1 kg of oxygen. (Assume no CO2 is formed).

A
27.54 mol
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B
18.96 mol
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C
13.65 mol
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D
31.25 mol
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Solution

The correct option is D 31.25 mol
Balanced reaction : C6H12+6O26CO+6H2O
We know that,
Number of moles = Given massMolar mass

Number of moles of C6H12 = 84084 = 10 mol
Number of moles of O2 = 100032 = 31.25 mol
We know that whenever moles of more than one reactant is given, we need to determine the Limiting Reagent (LR) to find the product of the reaction.
Calculating LR,
For Hexene = number of molesstoichiometric coefficient = 101 = 10
For Oxygen = number of molesstoichiometric coefficient = 31.256 = 5.20

Since the above ratio is less for Oxygen, the limiting reagent will be Oxygen.
As per stoichiometry, 6 mol of O2 reacts to form 6 mol of CO
So, 31.25 mol will form 31.25 mol of CO

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