Question

Ajuta ți ma va roggg repede

Answer 1

Răspuns:

Explicație:

1.

n= 30115.10²³ : 6,022 10²³= 5000 moli He

n=m : M

m= n . M

m= 5000moli .4g/moli= 20000 g He

2.

m=n . M

m= 2moli . 24g/moli= 48g Mg

3.

n=m : M

n= 560g  : 56g/moli=10moli Fe

4.

300 m moli= 0,3 moli Ca

1mol Ca ----------6,022.10 ²³atomi Ca

0,3 moli ----------------x

x= 0,3  . 6,022.10²³atomi Ca= 1,8066.10²³atomi Ca

5.

m= n. M

m= 100moli .39g/moli= 3900 g K