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21dag=210gram
3,kg=3500gram
210/3500*100%=6%
Zadanie 2.
Cp=(ms/mr)*100%
5%=(ms/5)*100% /*5
25=ms*500 /:500
ms=25/500
ms=0,05 kg=5dag
Musi przygotować 5dag soli.
Cp = 5 %
mr = 5 kg = 5000g
ms = ?
ms = Cp*mr/100%
ms = 5*5000/100=250g
ms = 25dag
Można nawet spr biorąc Cp za niewiadome :
ms = 25dag = 250g
mr = 5kg = 5000g
cp = ?
cp = ms/mr*100
Cp = 250/5000*100
Cp = 5%