I n   t h i s   q u e s t i o n ,   h o w   d o   w e   k n o w   i t   i s   2   m o l   o f   C l 2   g a s ?

C +2Cl2 ---> CCl4

See the coefficient of the reaction 
There is one mole Carbon and Two mole of Cl2 makes one mole 
CCl4

​Hope this helps !

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