Respostas

2013-12-02T16:57:45-02:00
 massa molecular total: 2.2 +16 = 20 
aq e alternativa a 18 b 36 c 16
2013-12-02T17:01:12-02:00
2H2= 1.4=4
2O= 2.16= 32

Resposta= 36
1 1 1