Question

As dori rezolvarea completă a exercițiilor 5,8,9. DAU COROANA!!!URGENT !!!

Answer 1

1.  M,Fe= 56g/mol       M,S=32g/mol          m,g=n,molxM,g/mol
m,amestec= 0,4x56,gFe + 0,6x32,gS=........................calculeaza 1!!!

2.ro= m/.v---> m=roxv= 2,7g/cm³x1cm³=2,7g
n,mol= m/M= 2,7g/27g/mol=0,1 mol,                deoarece M,Al= 27g/mol
1mol at.Al...contine...N,A=6,023x10²³ atomi( numarul lui Avogadro)
0,1mol.......................N= 6,023X10²² at Al

3.100g piatra vanata........36g apa
    10g.............................m=.3,6g apa

m,apa total= 990+3,6=,,,...................calculeaza !!!!