In the following chemical equation, why oxygen is written as 3O2 whereas it should be written as O2? And why the letter 's' is written in the bracket?Also explain this chemical equation in brief!
4Al(s) + 3O2(g) =2Al2O3(s)

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Solution

$A p r o p e r w a y o f w r i t i n g a c h e m i c a l e q u a t i o n i s 1) B a l a n c e d c h e m i c a l e q u a t i o n 2) A n y c o n d i t i o n f o r t h e p a r t i c u l a r r e a c t i o n 3) S t a t e s o f t h e r e a c \tan t a n d p r o d u c t s h o u l d b e m e n t i o n e d 4 A l_{(s)} + 3 {O_{2}}_{(g)} \to 2 A l_{2} {O_{3}}_{(s)} s s \tan d s f o r s o l i d s t a t e g s \tan d s f o r g a s e o u s s t a t e F o r b a l a n c i n g t h e n u m b e r o f o x y g e n a t o m w e a r e w r i t i n g t h e n u m b e r a s 3 O_{2}, s o t h a t 6 a t o m s o f o x y g e n a r e t h e r e .$

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