oblicz stężenie procentowe roztworu otrzymanego po rozpuszczeniu: a)20g substancji  w 100g wody b)25g ======== w 200g ==== c)10g ======== w 150g ====  

a)  ms=20g mr=20g+100g=120g Cp=?   Cp=ms/mr * 100% Cp=20g/120g * 100% Cp=16,7%     b)  ms=25g mr=25g+200g=225g Cp=?   Cp=ms/mr * 100% Cp=25g/225g * 100% Cp=11,1%     c)  ms=10g mr=10g+150g=160g Cp=?   Cp=ms/mr * 100% Cp=10g/160g * 100% Cp=6,25%

a) ms = 20g mw = 100g mr = ? mr = ms + mw  mr = 20g + 100g = 120g Cp = ms * 100% / mr Cp = 20g * 100% / 120g Cp = 16,7% b) ms = 25g mw = 200g mr = ? mr = ms + mw  mr = 25g + 200g = 225g Cp = ms * 100% / mr Cp = 25g * 100% / 225g Cp = 11,1% c) ms = 10g mw = 150g mr = ? mr = ms + mw  mr = 10g + 150g = 160g Cp = ms * 100% / mr Cp = 10g * 100% / 160g Cp = 6,25%