Question

10 puncte! + coroana

Answer 1

Răspuns:

Explicație:

1.

a.     3moli Ag

m= n . M

m= 3moli .108g/moli= 324 g Ag

b.    0,3kmoli Ag = 300 moli Ag

m= 300moli. 108g/moli = 32400 g Ag

1.

a.   10 moli Br2

1mol Br2-------2  .  6,022.10 ²³atomi Br

10moli-----------------x

x= 10 . 2 . 6,022.10²³= 120,440 . 10²³atomi Br

b.  6 kmoli Br2 = 6000moli Br2

1molBr2-------2 . 6,022.10²³atomi Br

6000moli---------------y

y= 6000. 2 . 6,022.10²³ atomi Br=

3.

a.  280 g azot

n= m : M

MN2= 2.14=28------> 28g/moli

n= 280g : 28g/moli =10 moli N2

b.    28 kg azot = 28000g azot

n= 28000g : 28g/moli= 1000 g azot