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
An ideal gas can be liquified, because

Its molecular size is very small
Its critical temperature is more than 0°C
It gets solidified directly without becoming liquid
Forces operative between its molecules are negligible

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