Question

Sa se calculeze nr. de moli de subs. dizolvata continuta in:
1,5kg solutie NaCL, c=65%

Answer 1

concentratia / 100 = masa dizolvata / masa solutiei

concentratia = 65%

masa solutiei = 1,5 kg = 1500 g

masa dizolvata = c x ms : 100 =65 x 1500 : 100 = 975 grame NaCl

1 mol NaCl = 23 + 35,5 = 58,5 grame

nr mol NaCl = masa NaCl : masa molara = 975 g : 58,5 g = 16.67 mol