Odpowiedzi

2010-01-19T21:40:09+01:00
1) 5% C2H5OH

Cp = 5%
ms = 25 g
mr = ?
Cp = ms*100% / mr
Cp * mr = ms*100%
mr = ms*100% / Cp
mr = 500 g

2) 20% C2H5OH

Cp = 20%
ms = 25 g
mr = ?
Cp = ms*100% / mr
Cp * mr = ms*100%
mr = ms*100% / Cp
mr = 125 g

3) 40% C2H5OH

Cp = 40%
ms = 25 g
mr = ?

Cp = ms*100% / mr
Cp * mr = ms*100%
mr = ms*100% / Cp
mr = 62,5 g
3 5 3