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m- masa
V-objętość
d- gęstość
d= m/V
m= d×V
m= 0,73g/dm³ × 0,5dm³
m= 0,365g amoniaku
400cm³ wody = 400g wody
Cp= ms/mr × 100%
Cp= 0,365/(0,365+400) × 100%
Cp= 0,091%
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