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Mbacl2=208
m na2so4=142g
Fe2(so4)3=400g
1,5g na2so4=xg nacl
142g=117
x=1,23 g nacl
1,5g -x
400g Fe2(so403=325 g fecl3
x=1,22g
1,22+1,23=2,45g
odp: nalezy dodac 2,45 g bacl2