Question

Sa se determine nr. de moli si nr. de atomi din a) 4,8g magneziu b) 8 g hidrogen c) 64g sulf​

Answer 1

Răspuns:

Explicație:

a.

n= m : M

n= 4,8g : 24g/moli= 0,2 moli Mg

1mol Mg ----------6,022.10²³atomi Mg

0,2moli -------------------x

x= 0,2  .  6,022.10²³atomi Mg  = 1,2044.10²³atomi Mg

b.    n= 8g : 2g/moli= 4moli H2

1mol H2---------2.6,022.10²³atomi H

4moli H2----------x

x= 4  . 2 . 6,022.10 ²³atomi = 48,176.10²³atomi H

c.

n= 64g : 32g/moli= 2moli S

1mol S----------6,022.10²³atomi S

2moli S------------x=

x= 2.  6,022.10²³atomi S = 12,044 .10²³atomi S