Question

sa se calculeze masa moleculara, taport atomic, raport de masa si formula procentuala pentru:
oxid de aluminiu
hidroxid de calciu
acid colhidric

Answer 1

MAl2O3 = 2AAl+3AO=2*27=3*16=102g/mol

raport atomic => 2:3

raport de masa => 54g:48g=27g:24g=9g:8g

mAl = 2*27=54g     mO2=3*16=48g

%Al=mAl/M*100=54/102*100= Calculeaz!

%O=mO/M*100=48/102*100=Calculeaza!

MCa(OH)2 = ACa+2(AO+AH) = 40+2(16+1)=74g/mol

raport atomic => 1:2:2

raport de masa => 40g:32g:2g=20g:16g:1g

%Ca=mCa/M*100=40/74*100=Calculeaza !

%O=mO/M*100=32/74*100=

%H=mH/M*100=2/74*100=

MHCl = AH + ACl = 1+35,5=36,5g/mol

raport atomic => 1:1

raport de masa => 1g:35,5g

%H=mH/M*100=1/36,5*100=

%Cl=mCl/M*100=35,5/36,5*100=