Because a new liquid flow rate is calculated in Eq. (6-17) as (sum_{mathrm{i}=1}^{mathrm{C}} ell_{mathrm{i}, mathrm{j}}), why do

Question:

Because a new liquid flow rate is calculated in Eq. (6-17) as $\sum_{\mathrm{i}=1}^{\mathrm{C}} \ell_{\mathrm{i}, \mathrm{j}}$, why do we not set $\mathrm{L}_{\mathrm{j}, \text { new }}$ equal to this value instead of reverting back to $\mathrm{L}_{\mathrm{j}, \text { old }}$ after calculating the liquid mole fractions?

Equation (6-17)

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