Boron trichloride gas is fed into a gas stream and used for doping silicon. The reaction is as follows.  4 BCl3 + 3 Si → 3 SiCl4 + 4 B  If all BCl3 not reacted is recycled, what is the mole ratio of recycle to SiCl4 exiting the separator if the conversion on one pass through the reactor is 76% and 1 mole per hr of BCl3 is fed to the reactor?

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