Question

Se dă:
Ca (O H) 2
Aca= 40
Ao=16
AH= 1
Se cere
a) masa moleculara
b) raportul atomic
c) raportul de masa
d)compozitia procentuală

Answer 1

Ca(OH)2 M=40+2.16+2=74-------->1mol=74g

raport atomic=r.a.=1Ca:2O:2H=1:2:2

raport de masa-r.m.=ACa:2AO:2AH=40:2.16:2.1=40:32:2=20 :16:1

compozitie procentuala prin masa moleculara

74g Ca(OH)2---------40g Ca--------32gO----------2gH

100 g---------------------xg---------------y-----------------z

x=100.40:74=54,05 la suta Ca

y=100.32:74=43,24 la suta O

Z=100.2:74=2.70 la suta H