Question

Repede pleaseeee, dau corona ​

Answer 1

Răspuns:

1.

Na

Z=11, A=23

1s2 2s2 2p6 3s1 grupa a I a A perioada 3 valenta 1

11e, 11p, 12n

Cl

Z=17 A=35

1s2 2s2 2p6 3s2 3p5 gruapa VII a a perioada 3 valenta 1

17e, 17p, 18n

2.

100gNa.................80gNa pur

140g Na..............xgNapur

x=140×80/100=112g Napur

MNa=23g/mol

MNaCl=23+35,5=58,5g/mol

2×23g                2×58,5g

2Na +  2HCl  →  2NaCl  +  H2↑

112g                      ygNaCl

y=112×2×58,5/2×23=284.86g NaCl

3.

NaNO3 azotat de sodiu

MNaNO3=23+14+3×16=85g/mol

85gNaNO3.....................23gNa

100gNaNO3....................zgNa

z=100×23/85=calculeaza

Explicație: