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
