Răspuns:
Explicație:
M HCl = 36.5 g/mol
2 moli au 36,5 x 2 = 73 g
100 g solutie 10% ...............10 g HCl.........................................90 g apa
700 g solutie 10%...............700*10/100 = 70 g HCl.............700-70=630 g apa
Solutia finala are 630 g apa si 73 + 70 = 143 g HCl, in total 630 +143 = 773 g
773 g solutie .....................143 g HCl
100 g solutie......................c = 143*100/773 = 18,5%
