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CO(NH2)2
C = 12g
O = 16g
N = 14x2 = 28g
H = 1x2x2 = 4g
_____________
CO(NH2)2 = 60g
regla de 3
1mol ---- 60g
0.4 mol ---- x
x = 60(0.4)
x = 24g
Rpta: en 0.4 moles de urea hay 24 gramos del mismo. :)