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28 .
H2O2--------apa oxigenata
H2O----------apa
-sunt pe o parghie care nu este in echilibru deoarece la H2O2 este un atom de O in plus
29. 1mol=0,001kmoli
CuSO4
M=64 +32+4.16=160------->160g/moli
160g CuSO4--------> 1mol CuSO4------> 0,001 kmoli
SO3
M=32 +3.16=80------> 80g/moli
80g--------> 1mol SO3
HNO3
M=1+14 +3.16=63------->63g/moli
63g HNO3--------> 1mol HNO3
HCl
M=1 +35,5=36,5------>36,5g/moli
36,5g HCl-----> 1mol HCl
H2O
M= 2 +16=18------>18g/moli
18gH2O------> 1mol H2O
30.
CO2
r.a.= 1C : 2O =1 : 2
Ca(OH)2
r.a. = 1 : 2 : 2
HNO3
r.a.= 1 : 1 : 3
H3PO4
r.a.= 3 : 1 : 4
NH4OH
r.a.= 1 : 5 : 1
Ca3(PO4)2
r.a.= 3 : 2 : 8
31.
raport de masa prin masa moleculara
MCaCO3=40+ 12+3.16=100-------> 100g/moli
100g CaCO3---------40g Ca--------12gC--------48gO
100g-------------------------x--------------y------------------z
x=40%Ca
y=12%C
z= 48% O
MSO3=32 +3.16=80-----> 80 g/moli
80g SO3---------32g S---------48gO
100g-------------------x-----------------y
x=100.32 : 80=40% S
y= 100.48:80=60%O
MAl(NO3 )3= 27 + 3.14 +9.16=213------>213g/moli
213g Al(NO3)3--------27gAl---------42g N----------144gO
100-------------------------x------------------y------------------z
x=100.27 : 213=12,68% Al
y=100.42: 213=19,72% N
z= 100.144: 213=67,60% O