First slide

General discussion of solutions

Question

In the given diagram CD: Fixed wall, EF : SPM, Fixed wall : allows the pressure transfer but no mass transfer. If 16 gm Helium present in ABCD chamber calculate the length of this chamber in cm if no osmosis takes place through SPM EF. Assume 75% ionization of $K_{4} [F e {(C N)}_{6}] .$ ( $R = 0.0821 L - a t m / m o l - R$ )

Moderate

Solution

$i = 1 + (y - 1) α$
$i = 1 + (5 - 1) 0.75$
$π = i C R T$
$π = 4 \times 2 \times 0.0821 \times 300$
For $H e P V = n R T$
$π V = n R T$
$2 \times 0.0821 \times 300 \times 4 \times 100 \times l \times 10^{- 3} = \frac{16}{4} \times 0.0821 \times 300$
$l = \frac{4}{8 \times 10^{- 1}} = \frac{40}{8} = 5 c m$

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