Question

Calculate the amount of oxygen that will be required for complete combustion of 2 moles of acetylene $C_2{H}_2$.
$2C_2{H}_2+5O_2⟶2{CO}_2+2H_{2}O$

Answer 1

Combustion of acetylene-

$C_2{H}_2+\frac{5}{2}{O}_2⟶2C{O}_2+H_{2}O$

At STP,

$1$ mole of $O_2=22.4L$

$\frac{5}{2}$ mole of $O_2=22.4\times \frac{5}{2}=56L$

Now, from the above equation-

Amount of oxygen required for the complete combustion of $1$ mole of acetylene $=56L$

Therefore,

Amount of oxygen required for the complete combustion of $2$ mole of acetylene $=56\times 2=112L$

Hence $112L$ of oxygen will be required for complete coombustion of $2$ moles of Acetylene.