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Ca+Br₂--->CaBr₂
80g x
x=80*200/40=400g
mCa - 40u
mBr2 - 160u
mCaBr2 - 200u
40u - 80g
200u - x
x=200*80 / 40 = 400
x=40g
odp. Otrzymamy 400g bromku wapnia.