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1)Cati moli se gasesc in 490 g acid sulfuric?
2) Cate molecule sunt in 189g acid azotic?
3)Cat cantaresc 7 moli de accid fosforic?


Răspuns :

fie n-nr de moli
m-masa data de acid sulfuric
M-masa moleculara
MH2SO4= 2 AH + A S+ 4 AO =2+32+ 64 = 98 U.A.M
n=m supra M
n= 490 supra 98 
n= 5 moli