Question

Cati atomi se gasesc in 16 grame de oxigen?

Answer 1

M= m/miu = 1 ( miu este masa atomica a oxigenului = 16g/)
                       ( m este masa oxigenului = 16$g/_{mol}  <strong></strong> M = [tex] \frac{N}{N _A{}}$ ==> N = M x N_{A} = 6,022 x 10^{23}


N_{A} --> numarul lui Avogadro

Answer 2

O2

AO=16

                                            MO2=2.16=32--------> 1mol=32g

                                            32 g O----------1mol O

                                                  16 gO------------X

                                          X=16:32=0,5 moli O

                                                                                     23

                                    1mol O-----------6,023.10 atomi O

                                              0,5 moli O--------y             23

                                                 y=0,5 .6,023.10 atomi O