Question

............................

Answer 1

a)

notam oricare hidrura EHn, E = elementul, iar n = valenta elementului E

EHn = 20 g/mol si contine 5% H

=>

100% ........................ 5% H

20g .......................... n g H

=> n = 1 => EH

=> Ae + 1 =20 => Ae = 19 => HF

EHn = 18 g/mol si contine 11,11% H

=>

100% ........................ 11,11% H

18g .......................... n g H

=> n = 2 => EH2

=> Ae + 2 =18 => Ae = 16 => H2S

EHn = 17 g/mol si contine 17,65% H

=>

100% ........................ 17,65% H

17g .......................... n g H

=> n = 3 => EH

=> Ae + 3 =17 => Ae = 14 => NH3

b)

cauta-le in caiet .... sigur s-au prezentat

c)

p.f. creste odata cu cesterea polaritatii moleculei

NH3, H2S, HF

--------------------->

creste