Question

In apa cu masa 128 g, s-a dizolvat Alcool metilic (CH₃0H) cu volumul 40 ml si ρ (ro)= 0,8 g/mol. Determina concentratia molara (Cm) a solutiei obtinute
daca ρ=0,98 g/mol

Answer 1

c,m=  niu,mol/ V,l

m,apa= 128g----> V apa= 128ml,  deoarece are densitatea 1g/ml
V,alcool=40ml
V,sol= 128+40=>168ml=0,168l

m,alcool= 4ox0,8g/ml= 32g
M, alcool= (12gC+4gH+16gO)/mol-> 32g/mol
niu= 32g/32g/mol --> 1mol alcool

c,m=1mol/ 0,168l         calculeaza   !!!!!!