Răspuns:
Explicație:
160 g CH4
moli CH4
nr. molecule CH4
n= m : M
MCH4= 12 + 4=16--------> 16g/moli
n= 160g : 16g/moli= 10 moli CH4
1mol CH4----------6,023.10²³ molecule CH4
10 moli-----------------------x
x= 10 . 6,023.10²³= 60,23.10²³molecule CH4
