Răspuns:
Explicație:
n = m : M
m= n . M
a.
m= n . M
n= 3moli .40g/moli =120g Ca
b.
m= 10moli . 12g/moli =120g C
c
2kmoli=2000moli P
m= 2000moli . 31g/moli = 62000g P
SAU
m= 2kmoli . 31kg/kmoli = 62 kg P
d.
n = 12,044 .10²³ : 6,022.10²³ = 2moli K
m= 2moli . 39g/moli =78g K
