Question

Assuming all volumes measured at the same temperature and pressure, state the volume ratio of the reactants and products when acetylene (ethyne) burning in oxygen to give carbon dioxide and steam.

• A. 1 : 5 : 4 : 2
• B. 2 : 5 : 2 : 2
• C. 2 : 5 : 4 : 1
• D. 2 : 5 : 4 : 2

Answer 1

The correct option is D 2 : 5 : 4 : 2

$CH\equiv CH+\frac{5}{2}{O}_2\to 2C{O}_2+H_{2}O$

$2C_2{H}_2+5O_2\to 4C{O}_2+2H_{2}O$

Stiochiometry coefficients of $C_2{H}_2,O_2,C{O}_2$ & steam are

in Ratio of $2:5:4:2$

So volume ratio is $2:5:4:2$