a) MH2SO4=98g/mol
MBaCl2=208g/mol
H2SO4 + BaCl2 => BaSO4 + 2HCl
98g H2SO4................208g BaCl2
xg H2SO4...................41,6g BaCl2
x=98*41,6/208 = Calculeaza !!
b) C=md/ms*100=>md=C*ms/100=5,2*200/100=10,4g BaCl2
98g H2SO4................208g BaCl2
xg H2SO4...................10,4 BaCl2
x=98*10,4/208= Calculeaza !!