Alum, Al 2 (SO 4 ) 3 , is used in styptic pencils to stop minor bleeding.

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Alum, Al2(SO4)3, is used in styptic pencils to stop minor bleeding. What is the number of atoms in the chemical formula of alum? 

(a) 10 

(b) 12 

(c) 14 

(d) 17 

(e) 21.

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