Question

Se da urmatoarea schema de reactii. a) Identificati substantele notate cu litere mici ; b) Calculeaza masa moleculara, raportul atomic si raportul de masa pentru substantele notate in schema cu d, e, f. Se dau masele atomice: A Mg=24 ; A O=16 ; A H=1; A S=32; A C=12 *

Answer 1

Răspuns:

a)

2Na+ Cl2 => 2NaCl

2Mg+O2=> 2MgO

H2O + MgO => Mg(OH)2

SO3+ H2O => H2SO4

H2O + CO2 => H2CO3

b)

MgO

MMgO=24+16=40g/mol

r.at.Mg:O=1:1

r.m.Mg:O=24:16=3:2

H2CO3

MH2CO3=2×1+12+3×16=62g/mol

r.at.H:C:O=2:1:3

r.m.=H:C:O==2:12:48=1:6:24

SO3

MSO3=32+3×16=80g/mol

r.at.S:I=1:3

r.m.S:O=32:48=2:3