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Gaboru'
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Post Posted: 07-12-2015, 21:15:54 | Translate post to: ... (Click for more languages)

1.Se amesteca o solutie cu masa de 200g si concentratia 20% cu o alta solutie cu masa de 250 g si concentratie 10%. aflati concentratia finala
2. O solutie cu masa 250 g si concentratia 5% se amesteca cu o solutie cu masa de 150 g si concentratia 10%> Aflati concentratia finala
3. O solutie cu masa de 100g de concentratie 10% se amesteca cu o solutie de masa 500g si concentratie 20%. Care este concentratia finala
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tudor1297

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Post Posted: 07-12-2015, 23:14:11 | Translate post to: ... (Click for more languages)

1.
cp1 = (md1/ms1) * 100 => 20 = (md1/200) * 100 => md1 = 40g;
cp2 = (md2/ms2) * 100 => 10 = (md2/250) * 100 => md2 = 25;

mdf = md1 + md2 = 25 + 40 = 55;
msf = ms1 + ms2 = 200 + 250 = 450;
=> cpf = (mdf/msf) * 100 = (55/450) * 100 = 12.23%

Celelalte se fac absolut la fel, doar numerele se schimba.




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Gaboru'
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Post Posted: 08-12-2015, 20:40:46 | Translate post to: ... (Click for more languages)

Mersi mult

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Locked by PsychoLove, 29 December 2015 22:10



 
Post new topic   This topic is locked: you cannot edit posts or make replies.    Freakz Forum Index -> Omul si societatea, arta si cultura, timpul liber -> School & Education -> Homework zone  


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