Question

What volume of dioxygen is required for complete combustion of volumes of acetylene gas at NTP?

• A. 2 volumes
• B. 5 volumes
• C. 10 volumes
• D. 4 volumes

Answer 1

Answer: (B)

5 volumes

Answer 2

(2) : $\underset{1vol}{C_{2}H_{2}} + \underset{\frac{5}{2}vol}{\frac{5}{2}O_{2}} \rightarrow \underset{2vol.}{2CO_{2}} + H_{2}O$

1 vol. of $C_{2}H_{2}$requires $= \frac{5}{2}$vol. of $O_{2}$

2 vol. of $C_{2}H_{2}$requires $= \frac{5}{2} \times 2 = 5vol.$ of $O_{2}$