Stoichiometry
A butane isomerisation process produces 70 kmole/hr of pure isobutane. A purge stream removed continuously, contains 85% n-butane and 15% impurity (mole%). The feed stream is n-butane containing 1% impurity (mole%). The flow rate of the purge stream will be

5 kmole/hr
3 kmole/hr
4 kmole/hr
6 kmole/hr

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Stoichiometry
Heat of neutralisation of a strong acid and strong base is always a constant value, i.e., 57 KJ/Kg mole. This is because

The salt formed does not hydrolyse
Only OH⁻ and H⁺ ions react in every case
The strong base and strong acid reacts completely
The strong base and strong acid reacts in aqueous solution

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