Question

COMPLETEAZĂ URMĂTORUL TABEL:


(DAU CORONITA ȘI 15 PUNCTE) ​

Answer 1

Ca(OH)2      var stins

M= 40+ 2.16 + 2=74 --------> 74g/moli

r.m.=40: 32 : 2=20 : 16 : 1     [s-a simpl. cu 2 ]

Comp. proc. prin masa molara

74 g Ca(OH)2 ---------40g Ca -------32g O-------2g H

100g------------------------x----------------y------------------z

x=100 .40 : 74=54,05%Ca

y=100 .32 : 74=

z=100 .2 : 74=

Na2CO3   soda de rufe

M=2.23 + 12 + 3.16=106--------> 106 g/moli

r.m.=46 : 12 : 48=23 : 6 : 24    [s-a simpl. cu 2 ]

Comp. proc .

106g Na2CO3--------46g Na-------12g C -------48 g O

100g -----------------------x-----------------y-------------------z

x=100.46 : 106=43,4 %Na

y=100.12 : 106=

z=100.48 : 106=

CuSO4   piatra vanata

M=64 +32 +64=160-------> 160g/moli

r.m.=64: 32 : 64=2: 1 : 2    [s-a simpl. cu 32 ]

Comp.proc.

160g CuSO4-------64g Cu------32g C------64g O

100g----------------------x----------------y--------------z

x=100.64:160=40%Cu

y=100.32 :160=

z=100.64 : 160=

Te rog sa calculezi !!!!