Question

Determine (i) molecular weight
(ii) molar volume
(iii) compression factor(z) of the vapours and
(iv)which forces among gas molecules are dominating. the attractive or repulsive

• A. $18.1,50.25\times {10}^{-3},1.225$
• B. 22,45
• C. 22.8, 67.6
• D. 24.5 , 675.8

Answer 1

The correct option is A $18.1,50.25\times {10}^{-3},1.225$

Molecular Weight $\frac{r_x}{r_{O_2}}=\sqrt{\frac{M_{O_2}}{M_x}}$

$1.33=\sqrt{\frac{32}{M_x}}=18.1$

Molar Volume at $500K=\frac{Molecularweight}{densityof1mole}$

$=\frac{18.1\times {10}^{-3}}{0.36}=50.25\times {10}^{-3}{m}^3$

Compression factor $Z=\frac{PV}{RT}=\frac{1\times 50.25times{10}^{-3}}{0.082\times 500}=1.225$

As $Z>1$ Repulsive forces operate amongs molecules.