Question

numero de atomos de Ba presentes en 120 gramos

Answer 1

Mm Ba =  137.33  g/mol

átomos Ba = 120 g Ba x 1 mol Ba    x   6.022 x 10²³ àtomos Ba
                                       ``````````````      ````````````````````````````````
                                      137.33 g Ba          1 mol Ba

átomos Ba = 5.263 x 10²³