Question

Calculaţi numărul de particule (molecule şi atomi) din:
a)2,7 moli Br2
b)28 g He

Answer 1

Răspuns:

Explicație:

a.

1mol Br2----------6,022.10²³molecule Br2------2. 6,022.10²³atomi Br

2,7 moli Br2-----------x------------------------------------------y

x= 2,7 . 6,022.10²³ = 16, 2594 .10²³ Br2

Y= 2,7  . 2  .  6,022.10²³ = 32,5188.10²³ atomi Br

b.

n= 28g : 4g/moli= 7moli He

1mol He --------6,022.10²³ atomi He

7moli -----------------x

x= 7 . 6,022.10²³=42,154 .10²³atomi He