Question

3000 cc of oxygen was burnt with 600 cc of ethane($C_2{H}_6$). Calculate the volume of unused oxygen.

• A. 300 cc
• B. 600 cc
• C. 900 cc
• D. 1200 cc

Answer 1

Answer: (C)

900 cc

The reaction is as follows:

$C_2{H}_6+\frac{7}{2}{O}_2⟶2C{O}_2+3H_{2}O$

600 cc. of ethane reacts with $600\times \frac{7}{2}$, i.e., 2100 cc volume of oxygen.

Remaining volume of $O_2$ is $3000-2100=900cc.$