Respostas

2014-07-23T11:52:05-03:00
[k4p2o7] = 4.39 + 2.31 + 7.16 = 156 + 62 + 112 = 330 u

330 u ______ 100%
39 u ________p

p = 3900 / 330

p =  11,8%
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