Question

Salut, dau 50 de puncte,cine ma poate ajuta cu doua probleme la chime , 3.11 si 3.12 ! Le afisez mai jos .mersi mult

Answer 1

Răspuns:

M,Mg(OH)2=58g/mol

M,MgO= 40g/mol

58g....................40g

Mg(OH)2----> MgO + H2O

5,8g.................x=m=4gMgO

40g.................................120g

MgO + H2SO4----> MgSO4+H2O

4g.............................x=m=12gMgSO4

c=mdx100/ms----> md= cxms/100g=20x200/100g=40g NaOH

M,NaOH=40g/mol

M,Na2CO3=106g/mol

2x40g................................106g

2NaOH + CO2---> Na2CO3+ H2O

40g...........................x=m=53gNa2CO3

Explicație: