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a) woda
mH₂O=2u+16=18u
mH : mO = 2 : 16
mH : mO = 1 : 8
b) tlenek azotu(III)
mN₂O₃=28u+48u=76u
mN : mO = 28 : 48
mN : mO = 7 : 12
c) tlenek krzemu(IV)
mSiO₂=28u+32u=60u
mSi : mO = 28 : 32
mSi : mO = 7 : 8