Question

va rog mult sa ma ajutati in cateva ore trebuie sa predau tema

Answer 1

Răspuns:

Ca(OH)₂ + 2HCl -> CaCl₂ + 2H₂O

Ca(OH)₂: hidroxid de calciu- baza, HCL: acid clorhidric- acid, CaCl₂: clorura de calciu- sare, H₂O- apa - oxid

CaCO₃ ->  CaO + CO₂

CaCO₃- carbonat de calciu- sare, CaO- oxid de calciu, oxid, CO₂- dioxid de carbon, oxid

4Al+3O₂ -> 2Al₂O₃

Al- aluminiu, metal, O₂- oxigen, gaz, Al₂O₃- oxid de aluminiu- oxid

Fe₂O₃+2Al -> Al₂O₃ + 2Fe↓

Fe₂O₃- oxid de fier(III), oxid feric - oxid, Al- metal, aluminiu, Fe- metal, fier...

    112 g                x g

6. CaO+ H₂O => Ca(OH)₂

  56 g                 74 g      

μ CaO= A Ca+ A O= 40+16= 56 g.mol

μ Ca(OH)₂= A Ca+ 2*A O + 2*A H= 40+32+2=74 g/mol

x= 112*74/56= 128 g Ca(OH)₂

7. c= (md/ms)*100 => ms= md*100/c

ms= 5500 *100/60= 9166,67 g

m H₂O= ms-md= (9166,67 -5500)g= 3666,67 g