Question

imi trebuie 4,5 si 6 de pe fisa!
va rog mult ,o am lentru maine!!

Answer 1

4/.

a.

M(Na2S) = 23x2+32 = 78 g/mol

1 mol...........78 g

3 moli ..........x = 234 g

b.

M(Al3(CO3)3) = 27x3+(12+3x16)x3 = 234 g/mol

1 mol .................. 234 g

4 moli ................ x = 936 g

c.

il faci conform modele

5/.

1 mol de apa ...... contine 6,022x10la23 molecule

2 moli ........................x = 1,2x10la24 molecule

M(NaCl) = 35,5+23 = 58,5 g/mol

1 mol NaCl ..... 58,5 g ...... 6,022x10la23 molecule

                      29 g ............x = 2,98x10la23 molecule

6/.

M(Al(OH)3) = 27+(1+16)x3 = 78 g/mol

1 mol ..... 78 g....... 6,022x10la23 molecule

            x g .......... 18,069x10la23 molecule

=> x = 234 g

faci conform model....