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Q.
What is the weight of oxygen required for the complete combustion of $2.8\, kg$ of ethylene?
AIPMTAIPMT 1988Organic Chemistry – Some Basic Principles and Techniques
Solution:
$C _{2} H _{4}$ (ethylene) $+3 O _{2} \rightarrow 2 CO _{2}+2 H _{2} O$
To oxidise $1\, mol$ of ethylene we require $3$ moles of Oxygen
$\therefore $ For oxidising $28 \,g$ of ethylene we require $(3 \times 32) \,g$ of oxygen
$\therefore $ For oxidising $2800 \,g(2.8 \,kg )$ of ethylene we require $(96 \times 100) \,g$ of oxygen
$\therefore $ For oxidising $2.8\, kg$ of ethylene we require $9600\, g$ of oxygen
So to oxidise $2.8\, kg$ of ethylene we require $9.6\, kg$ of oxygen.