Question

ex 3 si 4 va rog frumos ​

Answer 1

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=