Question

Calculate the molecular weight of the given organic compound. If in Victor Meyer's method $0.2g$ of an organic substance displaced 56 mL of air at STP.

• A. 56
• B. 112
• C. 80
• D. 28

Answer 1

Answer: (C)

In Victor Meyer method:
Volume of air displaced = volume of vapour produced by organic compound
STP volume of vapour of organic compound = 56 mL
$Molesoforganiccompound=\frac{givenmassoforganiccompound}{molarmassoforganiccompound}Molesoforganiccompound=\frac{STPvolumeofvapourinmL}{22400}$
$\frac{w}{M_w}=\frac{V}{22400}\frac{0.2}{M_w}=\frac{56}{22400}{M}_w=\frac{22400\times 0.2}{56}{M}_w=80g/mol$