Question

determine as massas molares das seguintes substancias :a)ureia-CO(NH2)2:
b)pedra ume-K AL (so4)2.(2H20)

Answer 1

$CO(NH_{2})_{2}$

12 + 16 + 2 x 14 + 4 x 1 = 60g

$KAl(SO_{4})_{2}$ . $12H_{2}O$
39 + 27 + (2 x 32 +8 x 16) . (12 x (2 x 1 + 16))
(54 + 64 + 128) . 12 x 18
258 + 216
= 474g