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M apă evaporată=?
C1=40%
C2=15%
MS1=200g


Răspuns :

md=c*ms/100=40*200/100=80g 
ms2=md*100/c2=80 * 100/15=533,33 g
mH2O evap=ms2-ms1=533,33-200=333,33,g