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a)300 atoms of A+200molecules of B2 : – B2 is limiting reagent and 200 molecules of AB2 is formed. this is an answer of matching in GRB PHYSICAL CHEMISTRY FOR COMPETETIONS CH1 Q how could one decide limiting reagent without knowing the weights of elements.

 
a)300 atoms of A+200molecules of B2 : – B2 is limiting reagent and 200 molecules of AB2 is formed.
 
this is an answer of matching in GRB PHYSICAL CHEMISTRY FOR COMPETETIONS CH1
 
Q how could one decide limiting reagent without knowing the weights of elements.
 

Grade:11

1 Answers

Sahani Kumar
99 Points
5 years ago
General equation of the reaction is
A + B\rightarrow AB_2
It means that :
1atom of A require 1molecule of B2 for the formation of 1molecule of AB2 so
300 atom of A will require  300 molecule of B2.
but we have only 200 molecule of B2( which is less than that of what is needed) hence B2 is limiting reagent. 
Best of luck for your preparation!
Regards. 
 

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