Question

What is the volume ratio of the product gases obtained from the decomposition of phosphorous pentachloride?
$PC{l}_5\left(g\right)\to PC{l}_3\left(g\right)+C{l}_2\left(g\right)$

• A. 2:1
• B. 1:2
• C. 1:1
• D. 1:3

Answer 1

The correct option is C 1:1

$PC{l}_5\left(g\right)\to PC{l}_3\left(g\right)+C{l}_2\left(g\right)$

One mole of phosphorous pentachloride undergoes decomposition to form one mole of phosphorous trichloride and one mole of chlorine gas.
Thus, the molar ratio of the product gases is 1:1
Volume ratio is proportional to their molar ratio
Hence, volume ratio of the product gases is 1:1