Question

Ajutor!! Am nevoie chiar si partial, de preferat intreg va rog!!

Answer 1

S1. H₂CO₃ acid carbonic (acid)
Al₂O₃ oxid de aluminiu (oxid)
HBr acid bromhidric (acid)
P₂O₅ pentaoxid de fosfor  (oxid)
HNO₃ acid azotic  (acid)
MgO oxid de magneziu  (oxid)
NO sau NO₂ sau N₂O₂ monoxid(dioxid) de azot  (oxid)
H₃PO₄ acid fosforic   (acid)
FeO oxid de fier(II)    Fe₂O₃ oxid de fier(III)  (oxid)
CO monoxid de carbon sau CO₂ dioxid de carbon  (oxid)

S2. SiO₂
MSiO₂=28+2*16=60
60 g SiO₂..............32g O
100g SiO₂..............x
x=(32*100)/60=53,33% O

MH₃PO₄=3*1+31+4*16=3+31+64=98
98 g H₃PO₄................64 g O
100 g H₃PO₄................y
y=(64*100)/98=65,30 % O

S3. CaCO₃+2HCl⇒H₂O+CO₂+CaCl₂
CO₂+H₂SO₄ reacția nu are loc
MgCl₂+H₂SO₄⇒Mg(SO₄)+2HCl
Al+CO₂⇒AlO+CO
Fe(OH)₂+2HCl⇒FeCl₂+2H₂O
CaO+CO₂⇒CaCO₃

S4.mCO₂=?
ms=12 g Ca(OH)₂
C=26%

MCa(OH)₂=40+16*2+1*2=74
MCO₂=12+32=44
74 g          44g    
Ca(OH)₂+CO₂⇒CaCO₃+H₂O
3,12 g        x

c/100=md/ms⇒md=(C*ms)/100=(26*12)/100=3,12 g Ca(OH)₂

x=(44*3,12)/74=1,85 g CO₂