Question

URGENTTTTTTT !!! OFER COROANA + 30 PUNCTE PRIMULUI RĂSPUNS CORECT !
ex 2 de la 1 până la 4(1-4) va roooooooooog​

Answer 1

1.

₇N⁻³ => 1s2 2s2 2p6

E⁺ => 1s2 2s2 2p6 3s1 => gr. 1 (I-A), p. 3

2.

1 mol Cl2 ..... 2x6,022x10²³ atomi Cl ..... 2x17x6,022x10²³ e-

3.

3Ca = 3x40 = 120 g

(PO4)2 = 2P + 8O = 2x31 + 8x16

=> Ca:P:O = 120:62:128 /:2 = 60:31:64

4.

miu.CaCO3 = 40+12+4x16 = 100 g/mol

=> 100 g ......................... 40 g Ca

   300 g ........................ x = 120 g Ca