Question

In cate grame de Ca se afla acelasi nr.de electroni ca in 4 moli de Mg? Ajutati-ma va rogggggggggggg

Answer 1

Z,Mg= 12--->-1atom   are   12e
                    1mol at  are    12x6,023x10²³ e
                     4mol.................4x12x6,023x10²³ e

Z,Ca= 20----> 1atom   are    20e
                       1mol at.   are.....20x6,023x10²e
                          x.......................4x12x6,023x10²³e
x= 48/20 mol Ca
m= nxM=> m,Ca= 2,4molx40g/mol=                        calculeaza !!!!