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Reactioneaza 36 g metal trivalent cu o solutie de acid sulfuric (h2so4) de concentratie 49% si se degaja 44.8 L gaz in c.n. Determinati: a) formula moleculara a sarii rezultate si b) masa solutiei de h2so4. Vaa rooogg repedee!!

Răspuns :

Puia68
n,H2= V/Vm=44,8/22,4mol= 2mol H2

2Me+3H2SO4 ---> Me2(SO4)3+3H2
2mol...3mol................................3mol
x...........y.....................................2mol
x= 4/7 mol Me
y= 2molH2SO4

4/7xM,Me=36g---> M,Me=27g/mol---> Al----> Al2(SO4)3


m,H2SO4= nxM= 2X98g= 196g
c=mdx100/ms---> ms= mdx100/c= 196x100/49g=...................calculeaza !!!!

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