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a fost răspuns

Cati moli de acid sulfuric reactioneaza cu 3 moli Al? Cate grame de sare se obtin? Cati moli de degaj se degaja?

Răspuns :

2Al +3H2SO4=Al2(SO4)3+3H2
M 2Al =54
M 3H2SO4 =294
M Al2(SO4) 3=342
M 3H2 =6

54 g Al........ 1 mol
a g Al............. 3 moli
a=54×3
a=162 g Al
b=162×294/54
b=882 g H2SO4

294 g H2SO4........ 1 mol
882 g H2SO4 .......x moli
x=882/294
x=3 moli
y=342×882/294
y=1026 g Al2(SO4) 3
c=1026*6/342
c=18 g H2

6 g H2........ 1 mol
18 g H2....... Z moli
Z=18/6
Z=3 moli H2