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alcoolul etlic din laborator contine 96% alcool.Ce cantitate de apa contine 2 kg solutie?
a)800 g
b)8g
c)80g


Răspuns :

C=md/ms*100=>md=C*ms/100=96*2/100=1,92kg alcool

ms=md+mH2O=>mH2O=ms-md=2-1,92=0,8kg =800g