Question

At 727⁰C and 1.23 atm of total equilibrium pressure, SO3 is partially dissociated into SO2 and O2 according to SO3(g) $\rightleftharpoons$ SO2(g) + 1/2O2(g). The density of equilibrium mixture is 0.9 gm/litre. The degree of dissociation is:

• A. 1/3
• B. 2/3
• C. l/4
• D. 1/5.

Answer 1

Answer: (A)

1/3

Answer 2

SO3(g) $\rightleftharpoons$ SO2(g) + $\frac { 1 } { 2 }$ O2(g)

$1 - \alpha$ $\alpha$

$1 + \frac { \alpha } { 2 } = \frac { 80 } { 60 }$ $\alpha = \frac { 2 } { 3 }$