Răspuns:
Explicație:
3.
2Na +2 H2O=2NaOH +H2
2NaOH + CuCl2= Cu(OH)2 + 2NaCl
NaOH + HCl= NaCl + H2O
2NaOH + CO2= Na2CO3 + H2O
4.
HNO2
r.a.=1 : 1 :2
r.m. = 1 : 14 : 32
Comp. proc
M= 1+ 14 + 32=47----->47g/moli
47g HNO2-------------1gH--------14gN----------32gO
100g------------------------x-----------y-----------------z
x=100.1 : 47=
y=100.14 : 47=
z= 100.32 : 47=
HNO3
r.a.= 1: 1 : 3
r.m.= 1 : 14 : 48
cpmp. proc.
M= 1+ 14 +48=63
63gHNO3----------1gH-------------14gN----------48gO
100g------------------x-------------------y-----------------z
x=100.1 : 63=
y=100.14 : 63=
z=100.48 : 63=
