Question

Cati neuroni sunt intr un cub de Mg cu l=1 cm si f=2g/cm la a 2


Dau coroana

Answer 1

Mg  are Z=12=12p=12e, A=24=n+12p----> n=12---> deci 1atom are 12n

V=lxlxlxl=1cm³
d(densitatea) =m/V-----> m=2g
n(moli)=m/M= 2g/24g/mol=0,0833mol

1mol  are...6,023x10²³atomi
0,0833mol........N=0,5X10²³ atomi

1atom are........12n
0,5x10²³at..........neutroni= 12x0,5x10²³=  6x10²³