Respostas

2013-11-28T18:33:09-02:00
MM C14 H18 N2 O5 = 294 g

C = 12 u  . 14 = 168 g
H = 1 u . 18 = 18g
N = 14 u . 2 = 28 g
O  = 16 u . 5 =  80 g

C = 168 / 294 = 0,57 . 100% = 57%
H = 18 / 294 = 0,06  . 100% = 6%
N= 28 / 294 = 0,095 . 100% = 9,5%
O = 80 / 294 =  0,275 . ---------= 27,5%

C57% H6% N9,5% O27,5%