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17g NH3-----22,4dm3
xg NH3------500dm3
x=379,46g NH3
Gęstość wody d=1g/cm3, więc 1dm3=1kg=1000g
379,46g NH3-----1379,46g roztworu
xg NH3------------100g roztworu
x=27,5g NH3
x=27,5%