Răspuns:
n=nr.moli ; n=m:M ;m=masa subst. ;M=masa molara
Explicație:
9 ,8g xg yg zg
H2SO4 + BaCl2= BaSO4 +2HCl
98g 208g 233g 2.36,5g
x=9,8 . 208 :98=20,8 g BaCl2
n=20,8 g : 208g/moli=0,1moli BaCl2
y=9,8 . 233 :98=23,3g BaSO4
n=23,3g : 233g/moli=0,1moli BaSO4
z=9,8 .2 .36,5 :98=7,3 g HCl
n=7,3g : 73g/moli= 0,1 moli HCl
MH2SO4=2+32+4.16=98----->98g/moli
MBaCl2=137+2.35,5=208---->208g/moli
MBaSO4=137+32+4.16=233---->233g/moli
MHCl=1+35,5=36,5 ---->36,5g/moli