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Masa Ca=40
Masa Br= 80 ale są dwa więc 2*80=160
stosunek
Ca/2Br=40/160=1/4
mCa=40u
mBr=80u
mCa : mBr = 40u : 2*80u
mCa : mBr = 40 : 160
mCa : mBr = 1 : 4