Question

Aplicati legea conservarii atomilor a masei substantelor pentru:
acid sulfuric+hidroxid de magneziu =sulfat de magneziu+ apa

Calculati .Compozitia procentuala pentru hidroxid de magneziu.

Answer 1

H2SO4  + Mg(OH )2 =MgSO4 +2H2O

Comp. procentuala  a Mg(OH)2 prin masa moleculara

M=24+2.16 + 2=58 ------>1mol=58 g Mg( OH)2

58 g Mg ( OH )2----------24g Mg----------32g O---------2g H

100g----------------------------xg-------------------yg-------------zg

x=100 .24 :58=41,37 la suta Mg

y=100 .32  : 58=55,17 la suta O

z=100.2 :58=3,44 la suta H