Question

What is the weight of oxygen required for the complete combustion of $2.8kg$ of ethylene?

• A. 2.8 kg
• B. 6.4 kg
• C. 9.6 kg
• D. 96 kg

Answer 1

Answer: (C)

$C_2{H}_4$ (ethylene) $+3O_2\to 2C{O}_2+2H_{2}O$
To oxidise $1mol$ of ethylene we require $3$ moles of Oxygen
$\therefore$ For oxidising $28g$ of ethylene we require $(3\times 32)g$ of oxygen
$\therefore$ For oxidising $2800g(2.8kg)$ of ethylene we require $(96\times 100)g$ of oxygen
$\therefore$ For oxidising $2.8kg$ of ethylene we require $9600g$ of oxygen
So to oxidise $2.8kg$ of ethylene we require $9.6kg$ of oxygen.