Respostas

2014-03-17T22:44:24-03:00
Regra de tres :
1 mol - cah2 = 40+2= 42 gramas
1,73 mol - x
X = 72,66 gramas
2014-03-18T12:25:34-03:00
CaH2= 40 +2 = 42 g / mol

 1Mol      ------- 42
1,73 Mol-------- Z g
Z= 72,66 g