Question

The vapour of phosphine gas at ${27}^{\circ }C$ and $3bar$ pressure has density.

• A. $4.09gm{L}^{-1}$
• B. $4.14g{L}^{-1}$
• C. $2.04kg{L}^{-1}$
• D. $2.04g{L}^{-1}$

Answer 1

The correct option is B $4.14g{L}^{-1}$

$P=\frac{dRT}{m}$

Molecular mass(m) of phosphine=$34$

$d=\frac{Pm}{RT}=\frac{3\times 34}{0.0821\times 300}=4.14g{L}^{-1}$